diff options
31 files changed, 298 insertions, 205 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index 4f55c736be11..5b448a74d0f7 100644 --- a/arch/Kconfig +++ b/arch/Kconfig | |||
@@ -47,18 +47,29 @@ config KPROBES | |||
47 | If in doubt, say "N". | 47 | If in doubt, say "N". |
48 | 48 | ||
49 | config JUMP_LABEL | 49 | config JUMP_LABEL |
50 | bool "Optimize trace point call sites" | 50 | bool "Optimize very unlikely/likely branches" |
51 | depends on HAVE_ARCH_JUMP_LABEL | 51 | depends on HAVE_ARCH_JUMP_LABEL |
52 | help | 52 | help |
53 | This option enables a transparent branch optimization that | ||
54 | makes certain almost-always-true or almost-always-false branch | ||
55 | conditions even cheaper to execute within the kernel. | ||
56 | |||
57 | Certain performance-sensitive kernel code, such as trace points, | ||
58 | scheduler functionality, networking code and KVM have such | ||
59 | branches and include support for this optimization technique. | ||
60 | |||
53 | If it is detected that the compiler has support for "asm goto", | 61 | If it is detected that the compiler has support for "asm goto", |
54 | the kernel will compile trace point locations with just a | 62 | the kernel will compile such branches with just a nop |
55 | nop instruction. When trace points are enabled, the nop will | 63 | instruction. When the condition flag is toggled to true, the |
56 | be converted to a jump to the trace function. This technique | 64 | nop will be converted to a jump instruction to execute the |
57 | lowers overhead and stress on the branch prediction of the | 65 | conditional block of instructions. |
58 | processor. | 66 | |
59 | 67 | This technique lowers overhead and stress on the branch prediction | |
60 | On i386, options added to the compiler flags may increase | 68 | of the processor and generally makes the kernel faster. The update |
61 | the size of the kernel slightly. | 69 | of the condition is slower, but those are always very rare. |
70 | |||
71 | ( On 32-bit x86, the necessary options added to the compiler | ||
72 | flags may increase the size of the kernel slightly. ) | ||
62 | 73 | ||
63 | config OPTPROBES | 74 | config OPTPROBES |
64 | def_bool y | 75 | def_bool y |
diff --git a/arch/ia64/include/asm/paravirt.h b/arch/ia64/include/asm/paravirt.h index 32551d304cd7..b149b88ea795 100644 --- a/arch/ia64/include/asm/paravirt.h +++ b/arch/ia64/include/asm/paravirt.h | |||
@@ -281,9 +281,9 @@ paravirt_init_missing_ticks_accounting(int cpu) | |||
281 | pv_time_ops.init_missing_ticks_accounting(cpu); | 281 | pv_time_ops.init_missing_ticks_accounting(cpu); |
282 | } | 282 | } |
283 | 283 | ||
284 | struct jump_label_key; | 284 | struct static_key; |
285 | extern struct jump_label_key paravirt_steal_enabled; | 285 | extern struct static_key paravirt_steal_enabled; |
286 | extern struct jump_label_key paravirt_steal_rq_enabled; | 286 | extern struct static_key paravirt_steal_rq_enabled; |
287 | 287 | ||
288 | static inline int | 288 | static inline int |
289 | paravirt_do_steal_accounting(unsigned long *new_itm) | 289 | paravirt_do_steal_accounting(unsigned long *new_itm) |
diff --git a/arch/ia64/kernel/paravirt.c b/arch/ia64/kernel/paravirt.c index 100868216c55..1b22f6de2932 100644 --- a/arch/ia64/kernel/paravirt.c +++ b/arch/ia64/kernel/paravirt.c | |||
@@ -634,8 +634,8 @@ struct pv_irq_ops pv_irq_ops = { | |||
634 | * pv_time_ops | 634 | * pv_time_ops |
635 | * time operations | 635 | * time operations |
636 | */ | 636 | */ |
637 | struct jump_label_key paravirt_steal_enabled; | 637 | struct static_key paravirt_steal_enabled; |
638 | struct jump_label_key paravirt_steal_rq_enabled; | 638 | struct static_key paravirt_steal_rq_enabled; |
639 | 639 | ||
640 | static int | 640 | static int |
641 | ia64_native_do_steal_accounting(unsigned long *new_itm) | 641 | ia64_native_do_steal_accounting(unsigned long *new_itm) |
diff --git a/arch/mips/include/asm/jump_label.h b/arch/mips/include/asm/jump_label.h index 1881b316ca45..4d6d77ed9b9d 100644 --- a/arch/mips/include/asm/jump_label.h +++ b/arch/mips/include/asm/jump_label.h | |||
@@ -20,7 +20,7 @@ | |||
20 | #define WORD_INSN ".word" | 20 | #define WORD_INSN ".word" |
21 | #endif | 21 | #endif |
22 | 22 | ||
23 | static __always_inline bool arch_static_branch(struct jump_label_key *key) | 23 | static __always_inline bool arch_static_branch(struct static_key *key) |
24 | { | 24 | { |
25 | asm goto("1:\tnop\n\t" | 25 | asm goto("1:\tnop\n\t" |
26 | "nop\n\t" | 26 | "nop\n\t" |
diff --git a/arch/powerpc/include/asm/jump_label.h b/arch/powerpc/include/asm/jump_label.h index 938986e412f1..ae098c438f00 100644 --- a/arch/powerpc/include/asm/jump_label.h +++ b/arch/powerpc/include/asm/jump_label.h | |||
@@ -17,7 +17,7 @@ | |||
17 | #define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) | 17 | #define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) |
18 | #define JUMP_LABEL_NOP_SIZE 4 | 18 | #define JUMP_LABEL_NOP_SIZE 4 |
19 | 19 | ||
20 | static __always_inline bool arch_static_branch(struct jump_label_key *key) | 20 | static __always_inline bool arch_static_branch(struct static_key *key) |
21 | { | 21 | { |
22 | asm goto("1:\n\t" | 22 | asm goto("1:\n\t" |
23 | "nop\n\t" | 23 | "nop\n\t" |
diff --git a/arch/s390/include/asm/jump_label.h b/arch/s390/include/asm/jump_label.h index 95a6cf2b5b67..6c32190dc73e 100644 --- a/arch/s390/include/asm/jump_label.h +++ b/arch/s390/include/asm/jump_label.h | |||
@@ -13,7 +13,7 @@ | |||
13 | #define ASM_ALIGN ".balign 4" | 13 | #define ASM_ALIGN ".balign 4" |
14 | #endif | 14 | #endif |
15 | 15 | ||
16 | static __always_inline bool arch_static_branch(struct jump_label_key *key) | 16 | static __always_inline bool arch_static_branch(struct static_key *key) |
17 | { | 17 | { |
18 | asm goto("0: brcl 0,0\n" | 18 | asm goto("0: brcl 0,0\n" |
19 | ".pushsection __jump_table, \"aw\"\n" | 19 | ".pushsection __jump_table, \"aw\"\n" |
diff --git a/arch/sparc/include/asm/jump_label.h b/arch/sparc/include/asm/jump_label.h index fc73a82366f8..5080d16a832f 100644 --- a/arch/sparc/include/asm/jump_label.h +++ b/arch/sparc/include/asm/jump_label.h | |||
@@ -7,7 +7,7 @@ | |||
7 | 7 | ||
8 | #define JUMP_LABEL_NOP_SIZE 4 | 8 | #define JUMP_LABEL_NOP_SIZE 4 |
9 | 9 | ||
10 | static __always_inline bool arch_static_branch(struct jump_label_key *key) | 10 | static __always_inline bool arch_static_branch(struct static_key *key) |
11 | { | 11 | { |
12 | asm goto("1:\n\t" | 12 | asm goto("1:\n\t" |
13 | "nop\n\t" | 13 | "nop\n\t" |
diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h index a32b18ce6ead..3a16c1483b45 100644 --- a/arch/x86/include/asm/jump_label.h +++ b/arch/x86/include/asm/jump_label.h | |||
@@ -9,12 +9,12 @@ | |||
9 | 9 | ||
10 | #define JUMP_LABEL_NOP_SIZE 5 | 10 | #define JUMP_LABEL_NOP_SIZE 5 |
11 | 11 | ||
12 | #define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t" | 12 | #define STATIC_KEY_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t" |
13 | 13 | ||
14 | static __always_inline bool arch_static_branch(struct jump_label_key *key) | 14 | static __always_inline bool arch_static_branch(struct static_key *key) |
15 | { | 15 | { |
16 | asm goto("1:" | 16 | asm goto("1:" |
17 | JUMP_LABEL_INITIAL_NOP | 17 | STATIC_KEY_INITIAL_NOP |
18 | ".pushsection __jump_table, \"aw\" \n\t" | 18 | ".pushsection __jump_table, \"aw\" \n\t" |
19 | _ASM_ALIGN "\n\t" | 19 | _ASM_ALIGN "\n\t" |
20 | _ASM_PTR "1b, %l[l_yes], %c0 \n\t" | 20 | _ASM_PTR "1b, %l[l_yes], %c0 \n\t" |
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h index a7d2db9a74fb..c0180fd372d2 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h | |||
@@ -230,9 +230,9 @@ static inline unsigned long long paravirt_sched_clock(void) | |||
230 | return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock); | 230 | return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock); |
231 | } | 231 | } |
232 | 232 | ||
233 | struct jump_label_key; | 233 | struct static_key; |
234 | extern struct jump_label_key paravirt_steal_enabled; | 234 | extern struct static_key paravirt_steal_enabled; |
235 | extern struct jump_label_key paravirt_steal_rq_enabled; | 235 | extern struct static_key paravirt_steal_rq_enabled; |
236 | 236 | ||
237 | static inline u64 paravirt_steal_clock(int cpu) | 237 | static inline u64 paravirt_steal_clock(int cpu) |
238 | { | 238 | { |
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index f0c6fd6f176b..694d801bf606 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c | |||
@@ -438,9 +438,9 @@ void __init kvm_guest_init(void) | |||
438 | static __init int activate_jump_labels(void) | 438 | static __init int activate_jump_labels(void) |
439 | { | 439 | { |
440 | if (has_steal_clock) { | 440 | if (has_steal_clock) { |
441 | jump_label_inc(¶virt_steal_enabled); | 441 | static_key_slow_inc(¶virt_steal_enabled); |
442 | if (steal_acc) | 442 | if (steal_acc) |
443 | jump_label_inc(¶virt_steal_rq_enabled); | 443 | static_key_slow_inc(¶virt_steal_rq_enabled); |
444 | } | 444 | } |
445 | 445 | ||
446 | return 0; | 446 | return 0; |
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index d90272e6bc40..ada2f99388dd 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c | |||
@@ -202,8 +202,8 @@ static void native_flush_tlb_single(unsigned long addr) | |||
202 | __native_flush_tlb_single(addr); | 202 | __native_flush_tlb_single(addr); |
203 | } | 203 | } |
204 | 204 | ||
205 | struct jump_label_key paravirt_steal_enabled; | 205 | struct static_key paravirt_steal_enabled; |
206 | struct jump_label_key paravirt_steal_rq_enabled; | 206 | struct static_key paravirt_steal_rq_enabled; |
207 | 207 | ||
208 | static u64 native_steal_clock(int cpu) | 208 | static u64 native_steal_clock(int cpu) |
209 | { | 209 | { |
diff --git a/arch/x86/kvm/mmu_audit.c b/arch/x86/kvm/mmu_audit.c index fe15dcc07a6b..ea7b4fd34676 100644 --- a/arch/x86/kvm/mmu_audit.c +++ b/arch/x86/kvm/mmu_audit.c | |||
@@ -234,7 +234,7 @@ static void audit_vcpu_spte(struct kvm_vcpu *vcpu) | |||
234 | } | 234 | } |
235 | 235 | ||
236 | static bool mmu_audit; | 236 | static bool mmu_audit; |
237 | static struct jump_label_key mmu_audit_key; | 237 | static struct static_key mmu_audit_key; |
238 | 238 | ||
239 | static void __kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) | 239 | static void __kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) |
240 | { | 240 | { |
@@ -250,7 +250,7 @@ static void __kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) | |||
250 | 250 | ||
251 | static inline void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) | 251 | static inline void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) |
252 | { | 252 | { |
253 | if (static_branch((&mmu_audit_key))) | 253 | if (static_key_false((&mmu_audit_key))) |
254 | __kvm_mmu_audit(vcpu, point); | 254 | __kvm_mmu_audit(vcpu, point); |
255 | } | 255 | } |
256 | 256 | ||
@@ -259,7 +259,7 @@ static void mmu_audit_enable(void) | |||
259 | if (mmu_audit) | 259 | if (mmu_audit) |
260 | return; | 260 | return; |
261 | 261 | ||
262 | jump_label_inc(&mmu_audit_key); | 262 | static_key_slow_inc(&mmu_audit_key); |
263 | mmu_audit = true; | 263 | mmu_audit = true; |
264 | } | 264 | } |
265 | 265 | ||
@@ -268,7 +268,7 @@ static void mmu_audit_disable(void) | |||
268 | if (!mmu_audit) | 268 | if (!mmu_audit) |
269 | return; | 269 | return; |
270 | 270 | ||
271 | jump_label_dec(&mmu_audit_key); | 271 | static_key_slow_dec(&mmu_audit_key); |
272 | mmu_audit = false; | 272 | mmu_audit = false; |
273 | } | 273 | } |
274 | 274 | ||
diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h index f7c69580fea7..2172da2d9bb4 100644 --- a/include/linux/jump_label.h +++ b/include/linux/jump_label.h | |||
@@ -9,15 +9,15 @@ | |||
9 | * | 9 | * |
10 | * Jump labels provide an interface to generate dynamic branches using | 10 | * Jump labels provide an interface to generate dynamic branches using |
11 | * self-modifying code. Assuming toolchain and architecture support the result | 11 | * self-modifying code. Assuming toolchain and architecture support the result |
12 | * of a "if (static_branch(&key))" statement is a unconditional branch (which | 12 | * of a "if (static_key_false(&key))" statement is a unconditional branch (which |
13 | * defaults to false - and the true block is placed out of line). | 13 | * defaults to false - and the true block is placed out of line). |
14 | * | 14 | * |
15 | * However at runtime we can change the 'static' branch target using | 15 | * However at runtime we can change the branch target using |
16 | * jump_label_{inc,dec}(). These function as a 'reference' count on the key | 16 | * static_key_slow_{inc,dec}(). These function as a 'reference' count on the key |
17 | * object and for as long as there are references all branches referring to | 17 | * object and for as long as there are references all branches referring to |
18 | * that particular key will point to the (out of line) true block. | 18 | * that particular key will point to the (out of line) true block. |
19 | * | 19 | * |
20 | * Since this relies on modifying code the jump_label_{inc,dec}() functions | 20 | * Since this relies on modifying code the static_key_slow_{inc,dec}() functions |
21 | * must be considered absolute slow paths (machine wide synchronization etc.). | 21 | * must be considered absolute slow paths (machine wide synchronization etc.). |
22 | * OTOH, since the affected branches are unconditional their runtime overhead | 22 | * OTOH, since the affected branches are unconditional their runtime overhead |
23 | * will be absolutely minimal, esp. in the default (off) case where the total | 23 | * will be absolutely minimal, esp. in the default (off) case where the total |
@@ -26,12 +26,26 @@ | |||
26 | * | 26 | * |
27 | * When the control is directly exposed to userspace it is prudent to delay the | 27 | * When the control is directly exposed to userspace it is prudent to delay the |
28 | * decrement to avoid high frequency code modifications which can (and do) | 28 | * decrement to avoid high frequency code modifications which can (and do) |
29 | * cause significant performance degradation. Struct jump_label_key_deferred and | 29 | * cause significant performance degradation. Struct static_key_deferred and |
30 | * jump_label_dec_deferred() provide for this. | 30 | * static_key_slow_dec_deferred() provide for this. |
31 | * | 31 | * |
32 | * Lacking toolchain and or architecture support, it falls back to a simple | 32 | * Lacking toolchain and or architecture support, it falls back to a simple |
33 | * conditional branch. | 33 | * conditional branch. |
34 | */ | 34 | * |
35 | * struct static_key my_key = STATIC_KEY_INIT_TRUE; | ||
36 | * | ||
37 | * if (static_key_true(&my_key)) { | ||
38 | * } | ||
39 | * | ||
40 | * will result in the true case being in-line and starts the key with a single | ||
41 | * reference. Mixing static_key_true() and static_key_false() on the same key is not | ||
42 | * allowed. | ||
43 | * | ||
44 | * Not initializing the key (static data is initialized to 0s anyway) is the | ||
45 | * same as using STATIC_KEY_INIT_FALSE and static_key_false() is | ||
46 | * equivalent with static_branch(). | ||
47 | * | ||
48 | */ | ||
35 | 49 | ||
36 | #include <linux/types.h> | 50 | #include <linux/types.h> |
37 | #include <linux/compiler.h> | 51 | #include <linux/compiler.h> |
@@ -39,16 +53,17 @@ | |||
39 | 53 | ||
40 | #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL) | 54 | #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL) |
41 | 55 | ||
42 | struct jump_label_key { | 56 | struct static_key { |
43 | atomic_t enabled; | 57 | atomic_t enabled; |
58 | /* Set lsb bit to 1 if branch is default true, 0 ot */ | ||
44 | struct jump_entry *entries; | 59 | struct jump_entry *entries; |
45 | #ifdef CONFIG_MODULES | 60 | #ifdef CONFIG_MODULES |
46 | struct jump_label_mod *next; | 61 | struct static_key_mod *next; |
47 | #endif | 62 | #endif |
48 | }; | 63 | }; |
49 | 64 | ||
50 | struct jump_label_key_deferred { | 65 | struct static_key_deferred { |
51 | struct jump_label_key key; | 66 | struct static_key key; |
52 | unsigned long timeout; | 67 | unsigned long timeout; |
53 | struct delayed_work work; | 68 | struct delayed_work work; |
54 | }; | 69 | }; |
@@ -66,13 +81,34 @@ struct module; | |||
66 | 81 | ||
67 | #ifdef HAVE_JUMP_LABEL | 82 | #ifdef HAVE_JUMP_LABEL |
68 | 83 | ||
69 | #ifdef CONFIG_MODULES | 84 | #define JUMP_LABEL_TRUE_BRANCH 1UL |
70 | #define JUMP_LABEL_INIT {ATOMIC_INIT(0), NULL, NULL} | 85 | |
71 | #else | 86 | static |
72 | #define JUMP_LABEL_INIT {ATOMIC_INIT(0), NULL} | 87 | inline struct jump_entry *jump_label_get_entries(struct static_key *key) |
73 | #endif | 88 | { |
89 | return (struct jump_entry *)((unsigned long)key->entries | ||
90 | & ~JUMP_LABEL_TRUE_BRANCH); | ||
91 | } | ||
92 | |||
93 | static inline bool jump_label_get_branch_default(struct static_key *key) | ||
94 | { | ||
95 | if ((unsigned long)key->entries & JUMP_LABEL_TRUE_BRANCH) | ||
96 | return true; | ||
97 | return false; | ||
98 | } | ||
99 | |||
100 | static __always_inline bool static_key_false(struct static_key *key) | ||
101 | { | ||
102 | return arch_static_branch(key); | ||
103 | } | ||
74 | 104 | ||
75 | static __always_inline bool static_branch(struct jump_label_key *key) | 105 | static __always_inline bool static_key_true(struct static_key *key) |
106 | { | ||
107 | return !static_key_false(key); | ||
108 | } | ||
109 | |||
110 | /* Deprecated. Please use 'static_key_false() instead. */ | ||
111 | static __always_inline bool static_branch(struct static_key *key) | ||
76 | { | 112 | { |
77 | return arch_static_branch(key); | 113 | return arch_static_branch(key); |
78 | } | 114 | } |
@@ -88,21 +124,24 @@ extern void arch_jump_label_transform(struct jump_entry *entry, | |||
88 | extern void arch_jump_label_transform_static(struct jump_entry *entry, | 124 | extern void arch_jump_label_transform_static(struct jump_entry *entry, |
89 | enum jump_label_type type); | 125 | enum jump_label_type type); |
90 | extern int jump_label_text_reserved(void *start, void *end); | 126 | extern int jump_label_text_reserved(void *start, void *end); |
91 | extern void jump_label_inc(struct jump_label_key *key); | 127 | extern void static_key_slow_inc(struct static_key *key); |
92 | extern void jump_label_dec(struct jump_label_key *key); | 128 | extern void static_key_slow_dec(struct static_key *key); |
93 | extern void jump_label_dec_deferred(struct jump_label_key_deferred *key); | 129 | extern void static_key_slow_dec_deferred(struct static_key_deferred *key); |
94 | extern bool jump_label_enabled(struct jump_label_key *key); | 130 | extern bool static_key_enabled(struct static_key *key); |
95 | extern void jump_label_apply_nops(struct module *mod); | 131 | extern void jump_label_apply_nops(struct module *mod); |
96 | extern void jump_label_rate_limit(struct jump_label_key_deferred *key, | 132 | extern void |
97 | unsigned long rl); | 133 | jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl); |
134 | |||
135 | #define STATIC_KEY_INIT_TRUE ((struct static_key) \ | ||
136 | { .enabled = ATOMIC_INIT(1), .entries = (void *)1 }) | ||
137 | #define STATIC_KEY_INIT_FALSE ((struct static_key) \ | ||
138 | { .enabled = ATOMIC_INIT(0), .entries = (void *)0 }) | ||
98 | 139 | ||
99 | #else /* !HAVE_JUMP_LABEL */ | 140 | #else /* !HAVE_JUMP_LABEL */ |
100 | 141 | ||
101 | #include <linux/atomic.h> | 142 | #include <linux/atomic.h> |
102 | 143 | ||
103 | #define JUMP_LABEL_INIT {ATOMIC_INIT(0)} | 144 | struct static_key { |
104 | |||
105 | struct jump_label_key { | ||
106 | atomic_t enabled; | 145 | atomic_t enabled; |
107 | }; | 146 | }; |
108 | 147 | ||
@@ -110,30 +149,45 @@ static __always_inline void jump_label_init(void) | |||
110 | { | 149 | { |
111 | } | 150 | } |
112 | 151 | ||
113 | struct jump_label_key_deferred { | 152 | struct static_key_deferred { |
114 | struct jump_label_key key; | 153 | struct static_key key; |
115 | }; | 154 | }; |
116 | 155 | ||
117 | static __always_inline bool static_branch(struct jump_label_key *key) | 156 | static __always_inline bool static_key_false(struct static_key *key) |
157 | { | ||
158 | if (unlikely(atomic_read(&key->enabled)) > 0) | ||
159 | return true; | ||
160 | return false; | ||
161 | } | ||
162 | |||
163 | static __always_inline bool static_key_true(struct static_key *key) | ||
118 | { | 164 | { |
119 | if (unlikely(atomic_read(&key->enabled))) | 165 | if (likely(atomic_read(&key->enabled)) > 0) |
120 | return true; | 166 | return true; |
121 | return false; | 167 | return false; |
122 | } | 168 | } |
123 | 169 | ||
124 | static inline void jump_label_inc(struct jump_label_key *key) | 170 | /* Deprecated. Please use 'static_key_false() instead. */ |
171 | static __always_inline bool static_branch(struct static_key *key) | ||
172 | { | ||
173 | if (unlikely(atomic_read(&key->enabled)) > 0) | ||
174 | return true; | ||
175 | return false; | ||
176 | } | ||
177 | |||
178 | static inline void static_key_slow_inc(struct static_key *key) | ||
125 | { | 179 | { |
126 | atomic_inc(&key->enabled); | 180 | atomic_inc(&key->enabled); |
127 | } | 181 | } |
128 | 182 | ||
129 | static inline void jump_label_dec(struct jump_label_key *key) | 183 | static inline void static_key_slow_dec(struct static_key *key) |
130 | { | 184 | { |
131 | atomic_dec(&key->enabled); | 185 | atomic_dec(&key->enabled); |
132 | } | 186 | } |
133 | 187 | ||
134 | static inline void jump_label_dec_deferred(struct jump_label_key_deferred *key) | 188 | static inline void static_key_slow_dec_deferred(struct static_key_deferred *key) |
135 | { | 189 | { |
136 | jump_label_dec(&key->key); | 190 | static_key_slow_dec(&key->key); |
137 | } | 191 | } |
138 | 192 | ||
139 | static inline int jump_label_text_reserved(void *start, void *end) | 193 | static inline int jump_label_text_reserved(void *start, void *end) |
@@ -144,9 +198,9 @@ static inline int jump_label_text_reserved(void *start, void *end) | |||
144 | static inline void jump_label_lock(void) {} | 198 | static inline void jump_label_lock(void) {} |
145 | static inline void jump_label_unlock(void) {} | 199 | static inline void jump_label_unlock(void) {} |
146 | 200 | ||
147 | static inline bool jump_label_enabled(struct jump_label_key *key) | 201 | static inline bool static_key_enabled(struct static_key *key) |
148 | { | 202 | { |
149 | return !!atomic_read(&key->enabled); | 203 | return (atomic_read(&key->enabled) > 0); |
150 | } | 204 | } |
151 | 205 | ||
152 | static inline int jump_label_apply_nops(struct module *mod) | 206 | static inline int jump_label_apply_nops(struct module *mod) |
@@ -154,13 +208,20 @@ static inline int jump_label_apply_nops(struct module *mod) | |||
154 | return 0; | 208 | return 0; |
155 | } | 209 | } |
156 | 210 | ||
157 | static inline void jump_label_rate_limit(struct jump_label_key_deferred *key, | 211 | static inline void |
212 | jump_label_rate_limit(struct static_key_deferred *key, | ||
158 | unsigned long rl) | 213 | unsigned long rl) |
159 | { | 214 | { |
160 | } | 215 | } |
216 | |||
217 | #define STATIC_KEY_INIT_TRUE ((struct static_key) \ | ||
218 | { .enabled = ATOMIC_INIT(1) }) | ||
219 | #define STATIC_KEY_INIT_FALSE ((struct static_key) \ | ||
220 | { .enabled = ATOMIC_INIT(0) }) | ||
221 | |||
161 | #endif /* HAVE_JUMP_LABEL */ | 222 | #endif /* HAVE_JUMP_LABEL */ |
162 | 223 | ||
163 | #define jump_label_key_enabled ((struct jump_label_key){ .enabled = ATOMIC_INIT(1), }) | 224 | #define STATIC_KEY_INIT STATIC_KEY_INIT_FALSE |
164 | #define jump_label_key_disabled ((struct jump_label_key){ .enabled = ATOMIC_INIT(0), }) | 225 | #define jump_label_enabled static_key_enabled |
165 | 226 | ||
166 | #endif /* _LINUX_JUMP_LABEL_H */ | 227 | #endif /* _LINUX_JUMP_LABEL_H */ |
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 0eac07c95255..7dfaae7846ab 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h | |||
@@ -214,8 +214,8 @@ enum { | |||
214 | #include <linux/skbuff.h> | 214 | #include <linux/skbuff.h> |
215 | 215 | ||
216 | #ifdef CONFIG_RPS | 216 | #ifdef CONFIG_RPS |
217 | #include <linux/jump_label.h> | 217 | #include <linux/static_key.h> |
218 | extern struct jump_label_key rps_needed; | 218 | extern struct static_key rps_needed; |
219 | #endif | 219 | #endif |
220 | 220 | ||
221 | struct neighbour; | 221 | struct neighbour; |
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h index b809265607d0..29734be334c1 100644 --- a/include/linux/netfilter.h +++ b/include/linux/netfilter.h | |||
@@ -163,13 +163,13 @@ extern struct ctl_path nf_net_ipv4_netfilter_sysctl_path[]; | |||
163 | extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; | 163 | extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
164 | 164 | ||
165 | #if defined(CONFIG_JUMP_LABEL) | 165 | #if defined(CONFIG_JUMP_LABEL) |
166 | #include <linux/jump_label.h> | 166 | #include <linux/static_key.h> |
167 | extern struct jump_label_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; | 167 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
168 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) | 168 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) |
169 | { | 169 | { |
170 | if (__builtin_constant_p(pf) && | 170 | if (__builtin_constant_p(pf) && |
171 | __builtin_constant_p(hook)) | 171 | __builtin_constant_p(hook)) |
172 | return static_branch(&nf_hooks_needed[pf][hook]); | 172 | return static_key_false(&nf_hooks_needed[pf][hook]); |
173 | 173 | ||
174 | return !list_empty(&nf_hooks[pf][hook]); | 174 | return !list_empty(&nf_hooks[pf][hook]); |
175 | } | 175 | } |
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 412b790f5da6..0d21e6f1cf53 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h | |||
@@ -514,7 +514,7 @@ struct perf_guest_info_callbacks { | |||
514 | #include <linux/ftrace.h> | 514 | #include <linux/ftrace.h> |
515 | #include <linux/cpu.h> | 515 | #include <linux/cpu.h> |
516 | #include <linux/irq_work.h> | 516 | #include <linux/irq_work.h> |
517 | #include <linux/jump_label.h> | 517 | #include <linux/static_key.h> |
518 | #include <linux/atomic.h> | 518 | #include <linux/atomic.h> |
519 | #include <asm/local.h> | 519 | #include <asm/local.h> |
520 | 520 | ||
@@ -1038,7 +1038,7 @@ static inline int is_software_event(struct perf_event *event) | |||
1038 | return event->pmu->task_ctx_nr == perf_sw_context; | 1038 | return event->pmu->task_ctx_nr == perf_sw_context; |
1039 | } | 1039 | } |
1040 | 1040 | ||
1041 | extern struct jump_label_key perf_swevent_enabled[PERF_COUNT_SW_MAX]; | 1041 | extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX]; |
1042 | 1042 | ||
1043 | extern void __perf_sw_event(u32, u64, struct pt_regs *, u64); | 1043 | extern void __perf_sw_event(u32, u64, struct pt_regs *, u64); |
1044 | 1044 | ||
@@ -1066,7 +1066,7 @@ perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) | |||
1066 | { | 1066 | { |
1067 | struct pt_regs hot_regs; | 1067 | struct pt_regs hot_regs; |
1068 | 1068 | ||
1069 | if (static_branch(&perf_swevent_enabled[event_id])) { | 1069 | if (static_key_false(&perf_swevent_enabled[event_id])) { |
1070 | if (!regs) { | 1070 | if (!regs) { |
1071 | perf_fetch_caller_regs(&hot_regs); | 1071 | perf_fetch_caller_regs(&hot_regs); |
1072 | regs = &hot_regs; | 1072 | regs = &hot_regs; |
@@ -1075,12 +1075,12 @@ perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) | |||
1075 | } | 1075 | } |
1076 | } | 1076 | } |
1077 | 1077 | ||
1078 | extern struct jump_label_key_deferred perf_sched_events; | 1078 | extern struct static_key_deferred perf_sched_events; |
1079 | 1079 | ||
1080 | static inline void perf_event_task_sched_in(struct task_struct *prev, | 1080 | static inline void perf_event_task_sched_in(struct task_struct *prev, |
1081 | struct task_struct *task) | 1081 | struct task_struct *task) |
1082 | { | 1082 | { |
1083 | if (static_branch(&perf_sched_events.key)) | 1083 | if (static_key_false(&perf_sched_events.key)) |
1084 | __perf_event_task_sched_in(prev, task); | 1084 | __perf_event_task_sched_in(prev, task); |
1085 | } | 1085 | } |
1086 | 1086 | ||
@@ -1089,7 +1089,7 @@ static inline void perf_event_task_sched_out(struct task_struct *prev, | |||
1089 | { | 1089 | { |
1090 | perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, NULL, 0); | 1090 | perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, NULL, 0); |
1091 | 1091 | ||
1092 | if (static_branch(&perf_sched_events.key)) | 1092 | if (static_key_false(&perf_sched_events.key)) |
1093 | __perf_event_task_sched_out(prev, next); | 1093 | __perf_event_task_sched_out(prev, next); |
1094 | } | 1094 | } |
1095 | 1095 | ||
diff --git a/include/linux/static_key.h b/include/linux/static_key.h new file mode 100644 index 000000000000..27bd3f8a0857 --- /dev/null +++ b/include/linux/static_key.h | |||
@@ -0,0 +1 @@ | |||
#include <linux/jump_label.h> | |||
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index fc36da97ff7e..bd96ecd0e05c 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h | |||
@@ -17,7 +17,7 @@ | |||
17 | #include <linux/errno.h> | 17 | #include <linux/errno.h> |
18 | #include <linux/types.h> | 18 | #include <linux/types.h> |
19 | #include <linux/rcupdate.h> | 19 | #include <linux/rcupdate.h> |
20 | #include <linux/jump_label.h> | 20 | #include <linux/static_key.h> |
21 | 21 | ||
22 | struct module; | 22 | struct module; |
23 | struct tracepoint; | 23 | struct tracepoint; |
@@ -29,7 +29,7 @@ struct tracepoint_func { | |||
29 | 29 | ||
30 | struct tracepoint { | 30 | struct tracepoint { |
31 | const char *name; /* Tracepoint name */ | 31 | const char *name; /* Tracepoint name */ |
32 | struct jump_label_key key; | 32 | struct static_key key; |
33 | void (*regfunc)(void); | 33 | void (*regfunc)(void); |
34 | void (*unregfunc)(void); | 34 | void (*unregfunc)(void); |
35 | struct tracepoint_func __rcu *funcs; | 35 | struct tracepoint_func __rcu *funcs; |
@@ -145,7 +145,7 @@ static inline void tracepoint_synchronize_unregister(void) | |||
145 | extern struct tracepoint __tracepoint_##name; \ | 145 | extern struct tracepoint __tracepoint_##name; \ |
146 | static inline void trace_##name(proto) \ | 146 | static inline void trace_##name(proto) \ |
147 | { \ | 147 | { \ |
148 | if (static_branch(&__tracepoint_##name.key)) \ | 148 | if (static_key_false(&__tracepoint_##name.key)) \ |
149 | __DO_TRACE(&__tracepoint_##name, \ | 149 | __DO_TRACE(&__tracepoint_##name, \ |
150 | TP_PROTO(data_proto), \ | 150 | TP_PROTO(data_proto), \ |
151 | TP_ARGS(data_args), \ | 151 | TP_ARGS(data_args), \ |
@@ -188,7 +188,7 @@ static inline void tracepoint_synchronize_unregister(void) | |||
188 | __attribute__((section("__tracepoints_strings"))) = #name; \ | 188 | __attribute__((section("__tracepoints_strings"))) = #name; \ |
189 | struct tracepoint __tracepoint_##name \ | 189 | struct tracepoint __tracepoint_##name \ |
190 | __attribute__((section("__tracepoints"))) = \ | 190 | __attribute__((section("__tracepoints"))) = \ |
191 | { __tpstrtab_##name, JUMP_LABEL_INIT, reg, unreg, NULL };\ | 191 | { __tpstrtab_##name, STATIC_KEY_INIT_FALSE, reg, unreg, NULL };\ |
192 | static struct tracepoint * const __tracepoint_ptr_##name __used \ | 192 | static struct tracepoint * const __tracepoint_ptr_##name __used \ |
193 | __attribute__((section("__tracepoints_ptrs"))) = \ | 193 | __attribute__((section("__tracepoints_ptrs"))) = \ |
194 | &__tracepoint_##name; | 194 | &__tracepoint_##name; |
diff --git a/include/net/sock.h b/include/net/sock.h index 91c1c8baf020..dcde2d9268cd 100644 --- a/include/net/sock.h +++ b/include/net/sock.h | |||
@@ -55,7 +55,7 @@ | |||
55 | #include <linux/uaccess.h> | 55 | #include <linux/uaccess.h> |
56 | #include <linux/memcontrol.h> | 56 | #include <linux/memcontrol.h> |
57 | #include <linux/res_counter.h> | 57 | #include <linux/res_counter.h> |
58 | #include <linux/jump_label.h> | 58 | #include <linux/static_key.h> |
59 | 59 | ||
60 | #include <linux/filter.h> | 60 | #include <linux/filter.h> |
61 | #include <linux/rculist_nulls.h> | 61 | #include <linux/rculist_nulls.h> |
@@ -924,13 +924,13 @@ inline void sk_refcnt_debug_release(const struct sock *sk) | |||
924 | #endif /* SOCK_REFCNT_DEBUG */ | 924 | #endif /* SOCK_REFCNT_DEBUG */ |
925 | 925 | ||
926 | #if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_NET) | 926 | #if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_NET) |
927 | extern struct jump_label_key memcg_socket_limit_enabled; | 927 | extern struct static_key memcg_socket_limit_enabled; |
928 | static inline struct cg_proto *parent_cg_proto(struct proto *proto, | 928 | static inline struct cg_proto *parent_cg_proto(struct proto *proto, |
929 | struct cg_proto *cg_proto) | 929 | struct cg_proto *cg_proto) |
930 | { | 930 | { |
931 | return proto->proto_cgroup(parent_mem_cgroup(cg_proto->memcg)); | 931 | return proto->proto_cgroup(parent_mem_cgroup(cg_proto->memcg)); |
932 | } | 932 | } |
933 | #define mem_cgroup_sockets_enabled static_branch(&memcg_socket_limit_enabled) | 933 | #define mem_cgroup_sockets_enabled static_key_false(&memcg_socket_limit_enabled) |
934 | #else | 934 | #else |
935 | #define mem_cgroup_sockets_enabled 0 | 935 | #define mem_cgroup_sockets_enabled 0 |
936 | static inline struct cg_proto *parent_cg_proto(struct proto *proto, | 936 | static inline struct cg_proto *parent_cg_proto(struct proto *proto, |
diff --git a/kernel/events/core.c b/kernel/events/core.c index 7c3b9de55f6b..5e0f8bb89b2b 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c | |||
@@ -128,7 +128,7 @@ enum event_type_t { | |||
128 | * perf_sched_events : >0 events exist | 128 | * perf_sched_events : >0 events exist |
129 | * perf_cgroup_events: >0 per-cpu cgroup events exist on this cpu | 129 | * perf_cgroup_events: >0 per-cpu cgroup events exist on this cpu |
130 | */ | 130 | */ |
131 | struct jump_label_key_deferred perf_sched_events __read_mostly; | 131 | struct static_key_deferred perf_sched_events __read_mostly; |
132 | static DEFINE_PER_CPU(atomic_t, perf_cgroup_events); | 132 | static DEFINE_PER_CPU(atomic_t, perf_cgroup_events); |
133 | 133 | ||
134 | static atomic_t nr_mmap_events __read_mostly; | 134 | static atomic_t nr_mmap_events __read_mostly; |
@@ -2769,7 +2769,7 @@ static void free_event(struct perf_event *event) | |||
2769 | 2769 | ||
2770 | if (!event->parent) { | 2770 | if (!event->parent) { |
2771 | if (event->attach_state & PERF_ATTACH_TASK) | 2771 | if (event->attach_state & PERF_ATTACH_TASK) |
2772 | jump_label_dec_deferred(&perf_sched_events); | 2772 | static_key_slow_dec_deferred(&perf_sched_events); |
2773 | if (event->attr.mmap || event->attr.mmap_data) | 2773 | if (event->attr.mmap || event->attr.mmap_data) |
2774 | atomic_dec(&nr_mmap_events); | 2774 | atomic_dec(&nr_mmap_events); |
2775 | if (event->attr.comm) | 2775 | if (event->attr.comm) |
@@ -2780,7 +2780,7 @@ static void free_event(struct perf_event *event) | |||
2780 | put_callchain_buffers(); | 2780 | put_callchain_buffers(); |
2781 | if (is_cgroup_event(event)) { | 2781 | if (is_cgroup_event(event)) { |
2782 | atomic_dec(&per_cpu(perf_cgroup_events, event->cpu)); | 2782 | atomic_dec(&per_cpu(perf_cgroup_events, event->cpu)); |
2783 | jump_label_dec_deferred(&perf_sched_events); | 2783 | static_key_slow_dec_deferred(&perf_sched_events); |
2784 | } | 2784 | } |
2785 | } | 2785 | } |
2786 | 2786 | ||
@@ -4982,7 +4982,7 @@ fail: | |||
4982 | return err; | 4982 | return err; |
4983 | } | 4983 | } |
4984 | 4984 | ||
4985 | struct jump_label_key perf_swevent_enabled[PERF_COUNT_SW_MAX]; | 4985 | struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX]; |
4986 | 4986 | ||
4987 | static void sw_perf_event_destroy(struct perf_event *event) | 4987 | static void sw_perf_event_destroy(struct perf_event *event) |
4988 | { | 4988 | { |
@@ -4990,7 +4990,7 @@ static void sw_perf_event_destroy(struct perf_event *event) | |||
4990 | 4990 | ||
4991 | WARN_ON(event->parent); | 4991 | WARN_ON(event->parent); |
4992 | 4992 | ||
4993 | jump_label_dec(&perf_swevent_enabled[event_id]); | 4993 | static_key_slow_dec(&perf_swevent_enabled[event_id]); |
4994 | swevent_hlist_put(event); | 4994 | swevent_hlist_put(event); |
4995 | } | 4995 | } |
4996 | 4996 | ||
@@ -5020,7 +5020,7 @@ static int perf_swevent_init(struct perf_event *event) | |||
5020 | if (err) | 5020 | if (err) |
5021 | return err; | 5021 | return err; |
5022 | 5022 | ||
5023 | jump_label_inc(&perf_swevent_enabled[event_id]); | 5023 | static_key_slow_inc(&perf_swevent_enabled[event_id]); |
5024 | event->destroy = sw_perf_event_destroy; | 5024 | event->destroy = sw_perf_event_destroy; |
5025 | } | 5025 | } |
5026 | 5026 | ||
@@ -5843,7 +5843,7 @@ done: | |||
5843 | 5843 | ||
5844 | if (!event->parent) { | 5844 | if (!event->parent) { |
5845 | if (event->attach_state & PERF_ATTACH_TASK) | 5845 | if (event->attach_state & PERF_ATTACH_TASK) |
5846 | jump_label_inc(&perf_sched_events.key); | 5846 | static_key_slow_inc(&perf_sched_events.key); |
5847 | if (event->attr.mmap || event->attr.mmap_data) | 5847 | if (event->attr.mmap || event->attr.mmap_data) |
5848 | atomic_inc(&nr_mmap_events); | 5848 | atomic_inc(&nr_mmap_events); |
5849 | if (event->attr.comm) | 5849 | if (event->attr.comm) |
@@ -6081,7 +6081,7 @@ SYSCALL_DEFINE5(perf_event_open, | |||
6081 | * - that may need work on context switch | 6081 | * - that may need work on context switch |
6082 | */ | 6082 | */ |
6083 | atomic_inc(&per_cpu(perf_cgroup_events, event->cpu)); | 6083 | atomic_inc(&per_cpu(perf_cgroup_events, event->cpu)); |
6084 | jump_label_inc(&perf_sched_events.key); | 6084 | static_key_slow_inc(&perf_sched_events.key); |
6085 | } | 6085 | } |
6086 | 6086 | ||
6087 | /* | 6087 | /* |
diff --git a/kernel/jump_label.c b/kernel/jump_label.c index 543782e7cdd2..bf9dcadbb53a 100644 --- a/kernel/jump_label.c +++ b/kernel/jump_label.c | |||
@@ -12,7 +12,7 @@ | |||
12 | #include <linux/slab.h> | 12 | #include <linux/slab.h> |
13 | #include <linux/sort.h> | 13 | #include <linux/sort.h> |
14 | #include <linux/err.h> | 14 | #include <linux/err.h> |
15 | #include <linux/jump_label.h> | 15 | #include <linux/static_key.h> |
16 | 16 | ||
17 | #ifdef HAVE_JUMP_LABEL | 17 | #ifdef HAVE_JUMP_LABEL |
18 | 18 | ||
@@ -29,10 +29,11 @@ void jump_label_unlock(void) | |||
29 | mutex_unlock(&jump_label_mutex); | 29 | mutex_unlock(&jump_label_mutex); |
30 | } | 30 | } |
31 | 31 | ||
32 | bool jump_label_enabled(struct jump_label_key *key) | 32 | bool static_key_enabled(struct static_key *key) |
33 | { | 33 | { |
34 | return !!atomic_read(&key->enabled); | 34 | return (atomic_read(&key->enabled) > 0); |
35 | } | 35 | } |
36 | EXPORT_SYMBOL_GPL(static_key_enabled); | ||
36 | 37 | ||
37 | static int jump_label_cmp(const void *a, const void *b) | 38 | static int jump_label_cmp(const void *a, const void *b) |
38 | { | 39 | { |
@@ -58,22 +59,26 @@ jump_label_sort_entries(struct jump_entry *start, struct jump_entry *stop) | |||
58 | sort(start, size, sizeof(struct jump_entry), jump_label_cmp, NULL); | 59 | sort(start, size, sizeof(struct jump_entry), jump_label_cmp, NULL); |
59 | } | 60 | } |
60 | 61 | ||
61 | static void jump_label_update(struct jump_label_key *key, int enable); | 62 | static void jump_label_update(struct static_key *key, int enable); |
62 | 63 | ||
63 | void jump_label_inc(struct jump_label_key *key) | 64 | void static_key_slow_inc(struct static_key *key) |
64 | { | 65 | { |
65 | if (atomic_inc_not_zero(&key->enabled)) | 66 | if (atomic_inc_not_zero(&key->enabled)) |
66 | return; | 67 | return; |
67 | 68 | ||
68 | jump_label_lock(); | 69 | jump_label_lock(); |
69 | if (atomic_read(&key->enabled) == 0) | 70 | if (atomic_read(&key->enabled) == 0) { |
70 | jump_label_update(key, JUMP_LABEL_ENABLE); | 71 | if (!jump_label_get_branch_default(key)) |
72 | jump_label_update(key, JUMP_LABEL_ENABLE); | ||
73 | else | ||
74 | jump_label_update(key, JUMP_LABEL_DISABLE); | ||
75 | } | ||
71 | atomic_inc(&key->enabled); | 76 | atomic_inc(&key->enabled); |
72 | jump_label_unlock(); | 77 | jump_label_unlock(); |
73 | } | 78 | } |
74 | EXPORT_SYMBOL_GPL(jump_label_inc); | 79 | EXPORT_SYMBOL_GPL(static_key_slow_inc); |
75 | 80 | ||
76 | static void __jump_label_dec(struct jump_label_key *key, | 81 | static void __static_key_slow_dec(struct static_key *key, |
77 | unsigned long rate_limit, struct delayed_work *work) | 82 | unsigned long rate_limit, struct delayed_work *work) |
78 | { | 83 | { |
79 | if (!atomic_dec_and_mutex_lock(&key->enabled, &jump_label_mutex)) { | 84 | if (!atomic_dec_and_mutex_lock(&key->enabled, &jump_label_mutex)) { |
@@ -85,32 +90,35 @@ static void __jump_label_dec(struct jump_label_key *key, | |||
85 | if (rate_limit) { | 90 | if (rate_limit) { |
86 | atomic_inc(&key->enabled); | 91 | atomic_inc(&key->enabled); |
87 | schedule_delayed_work(work, rate_limit); | 92 | schedule_delayed_work(work, rate_limit); |
88 | } else | 93 | } else { |
89 | jump_label_update(key, JUMP_LABEL_DISABLE); | 94 | if (!jump_label_get_branch_default(key)) |
90 | 95 | jump_label_update(key, JUMP_LABEL_DISABLE); | |
96 | else | ||
97 | jump_label_update(key, JUMP_LABEL_ENABLE); | ||
98 | } | ||
91 | jump_label_unlock(); | 99 | jump_label_unlock(); |
92 | } | 100 | } |
93 | EXPORT_SYMBOL_GPL(jump_label_dec); | ||
94 | 101 | ||
95 | static void jump_label_update_timeout(struct work_struct *work) | 102 | static void jump_label_update_timeout(struct work_struct *work) |
96 | { | 103 | { |
97 | struct jump_label_key_deferred *key = | 104 | struct static_key_deferred *key = |
98 | container_of(work, struct jump_label_key_deferred, work.work); | 105 | container_of(work, struct static_key_deferred, work.work); |
99 | __jump_label_dec(&key->key, 0, NULL); | 106 | __static_key_slow_dec(&key->key, 0, NULL); |
100 | } | 107 | } |
101 | 108 | ||
102 | void jump_label_dec(struct jump_label_key *key) | 109 | void static_key_slow_dec(struct static_key *key) |
103 | { | 110 | { |
104 | __jump_label_dec(key, 0, NULL); | 111 | __static_key_slow_dec(key, 0, NULL); |
105 | } | 112 | } |
113 | EXPORT_SYMBOL_GPL(static_key_slow_dec); | ||
106 | 114 | ||
107 | void jump_label_dec_deferred(struct jump_label_key_deferred *key) | 115 | void static_key_slow_dec_deferred(struct static_key_deferred *key) |
108 | { | 116 | { |
109 | __jump_label_dec(&key->key, key->timeout, &key->work); | 117 | __static_key_slow_dec(&key->key, key->timeout, &key->work); |
110 | } | 118 | } |
119 | EXPORT_SYMBOL_GPL(static_key_slow_dec_deferred); | ||
111 | 120 | ||
112 | 121 | void jump_label_rate_limit(struct static_key_deferred *key, | |
113 | void jump_label_rate_limit(struct jump_label_key_deferred *key, | ||
114 | unsigned long rl) | 122 | unsigned long rl) |
115 | { | 123 | { |
116 | key->timeout = rl; | 124 | key->timeout = rl; |
@@ -153,7 +161,7 @@ void __weak __init_or_module arch_jump_label_transform_static(struct jump_entry | |||
153 | arch_jump_label_transform(entry, type); | 161 | arch_jump_label_transform(entry, type); |
154 | } | 162 | } |
155 | 163 | ||
156 | static void __jump_label_update(struct jump_label_key *key, | 164 | static void __jump_label_update(struct static_key *key, |
157 | struct jump_entry *entry, | 165 | struct jump_entry *entry, |
158 | struct jump_entry *stop, int enable) | 166 | struct jump_entry *stop, int enable) |
159 | { | 167 | { |
@@ -170,27 +178,40 @@ static void __jump_label_update(struct jump_label_key *key, | |||
170 | } | 178 | } |
171 | } | 179 | } |
172 | 180 | ||
181 | static enum jump_label_type jump_label_type(struct static_key *key) | ||
182 | { | ||
183 | bool true_branch = jump_label_get_branch_default(key); | ||
184 | bool state = static_key_enabled(key); | ||
185 | |||
186 | if ((!true_branch && state) || (true_branch && !state)) | ||
187 | return JUMP_LABEL_ENABLE; | ||
188 | |||
189 | return JUMP_LABEL_DISABLE; | ||
190 | } | ||
191 | |||
173 | void __init jump_label_init(void) | 192 | void __init jump_label_init(void) |
174 | { | 193 | { |
175 | struct jump_entry *iter_start = __start___jump_table; | 194 | struct jump_entry *iter_start = __start___jump_table; |
176 | struct jump_entry *iter_stop = __stop___jump_table; | 195 | struct jump_entry *iter_stop = __stop___jump_table; |
177 | struct jump_label_key *key = NULL; | 196 | struct static_key *key = NULL; |
178 | struct jump_entry *iter; | 197 | struct jump_entry *iter; |
179 | 198 | ||
180 | jump_label_lock(); | 199 | jump_label_lock(); |
181 | jump_label_sort_entries(iter_start, iter_stop); | 200 | jump_label_sort_entries(iter_start, iter_stop); |
182 | 201 | ||
183 | for (iter = iter_start; iter < iter_stop; iter++) { | 202 | for (iter = iter_start; iter < iter_stop; iter++) { |
184 | struct jump_label_key *iterk; | 203 | struct static_key *iterk; |
185 | 204 | ||
186 | iterk = (struct jump_label_key *)(unsigned long)iter->key; | 205 | iterk = (struct static_key *)(unsigned long)iter->key; |
187 | arch_jump_label_transform_static(iter, jump_label_enabled(iterk) ? | 206 | arch_jump_label_transform_static(iter, jump_label_type(iterk)); |
188 | JUMP_LABEL_ENABLE : JUMP_LABEL_DISABLE); | ||
189 | if (iterk == key) | 207 | if (iterk == key) |
190 | continue; | 208 | continue; |
191 | 209 | ||
192 | key = iterk; | 210 | key = iterk; |
193 | key->entries = iter; | 211 | /* |
212 | * Set key->entries to iter, but preserve JUMP_LABEL_TRUE_BRANCH. | ||
213 | */ | ||
214 | *((unsigned long *)&key->entries) += (unsigned long)iter; | ||
194 | #ifdef CONFIG_MODULES | 215 | #ifdef CONFIG_MODULES |
195 | key->next = NULL; | 216 | key->next = NULL; |
196 | #endif | 217 | #endif |
@@ -200,8 +221,8 @@ void __init jump_label_init(void) | |||
200 | 221 | ||
201 | #ifdef CONFIG_MODULES | 222 | #ifdef CONFIG_MODULES |
202 | 223 | ||
203 | struct jump_label_mod { | 224 | struct static_key_mod { |
204 | struct jump_label_mod *next; | 225 | struct static_key_mod *next; |
205 | struct jump_entry *entries; | 226 | struct jump_entry *entries; |
206 | struct module *mod; | 227 | struct module *mod; |
207 | }; | 228 | }; |
@@ -221,9 +242,9 @@ static int __jump_label_mod_text_reserved(void *start, void *end) | |||
221 | start, end); | 242 | start, end); |
222 | } | 243 | } |
223 | 244 | ||
224 | static void __jump_label_mod_update(struct jump_label_key *key, int enable) | 245 | static void __jump_label_mod_update(struct static_key *key, int enable) |
225 | { | 246 | { |
226 | struct jump_label_mod *mod = key->next; | 247 | struct static_key_mod *mod = key->next; |
227 | 248 | ||
228 | while (mod) { | 249 | while (mod) { |
229 | struct module *m = mod->mod; | 250 | struct module *m = mod->mod; |
@@ -254,11 +275,7 @@ void jump_label_apply_nops(struct module *mod) | |||
254 | return; | 275 | return; |
255 | 276 | ||
256 | for (iter = iter_start; iter < iter_stop; iter++) { | 277 | for (iter = iter_start; iter < iter_stop; iter++) { |
257 | struct jump_label_key *iterk; | 278 | arch_jump_label_transform_static(iter, JUMP_LABEL_DISABLE); |
258 | |||
259 | iterk = (struct jump_label_key *)(unsigned long)iter->key; | ||
260 | arch_jump_label_transform_static(iter, jump_label_enabled(iterk) ? | ||
261 | JUMP_LABEL_ENABLE : JUMP_LABEL_DISABLE); | ||
262 | } | 279 | } |
263 | } | 280 | } |
264 | 281 | ||
@@ -267,8 +284,8 @@ static int jump_label_add_module(struct module *mod) | |||
267 | struct jump_entry *iter_start = mod->jump_entries; | 284 | struct jump_entry *iter_start = mod->jump_entries; |
268 | struct jump_entry *iter_stop = iter_start + mod->num_jump_entries; | 285 | struct jump_entry *iter_stop = iter_start + mod->num_jump_entries; |
269 | struct jump_entry *iter; | 286 | struct jump_entry *iter; |
270 | struct jump_label_key *key = NULL; | 287 | struct static_key *key = NULL; |
271 | struct jump_label_mod *jlm; | 288 | struct static_key_mod *jlm; |
272 | 289 | ||
273 | /* if the module doesn't have jump label entries, just return */ | 290 | /* if the module doesn't have jump label entries, just return */ |
274 | if (iter_start == iter_stop) | 291 | if (iter_start == iter_stop) |
@@ -277,28 +294,30 @@ static int jump_label_add_module(struct module *mod) | |||
277 | jump_label_sort_entries(iter_start, iter_stop); | 294 | jump_label_sort_entries(iter_start, iter_stop); |
278 | 295 | ||
279 | for (iter = iter_start; iter < iter_stop; iter++) { | 296 | for (iter = iter_start; iter < iter_stop; iter++) { |
280 | if (iter->key == (jump_label_t)(unsigned long)key) | 297 | struct static_key *iterk; |
281 | continue; | ||
282 | 298 | ||
283 | key = (struct jump_label_key *)(unsigned long)iter->key; | 299 | iterk = (struct static_key *)(unsigned long)iter->key; |
300 | if (iterk == key) | ||
301 | continue; | ||
284 | 302 | ||
303 | key = iterk; | ||
285 | if (__module_address(iter->key) == mod) { | 304 | if (__module_address(iter->key) == mod) { |
286 | atomic_set(&key->enabled, 0); | 305 | /* |
287 | key->entries = iter; | 306 | * Set key->entries to iter, but preserve JUMP_LABEL_TRUE_BRANCH. |
307 | */ | ||
308 | *((unsigned long *)&key->entries) += (unsigned long)iter; | ||
288 | key->next = NULL; | 309 | key->next = NULL; |
289 | continue; | 310 | continue; |
290 | } | 311 | } |
291 | 312 | jlm = kzalloc(sizeof(struct static_key_mod), GFP_KERNEL); | |
292 | jlm = kzalloc(sizeof(struct jump_label_mod), GFP_KERNEL); | ||
293 | if (!jlm) | 313 | if (!jlm) |
294 | return -ENOMEM; | 314 | return -ENOMEM; |
295 | |||
296 | jlm->mod = mod; | 315 | jlm->mod = mod; |
297 | jlm->entries = iter; | 316 | jlm->entries = iter; |
298 | jlm->next = key->next; | 317 | jlm->next = key->next; |
299 | key->next = jlm; | 318 | key->next = jlm; |
300 | 319 | ||
301 | if (jump_label_enabled(key)) | 320 | if (jump_label_type(key) == JUMP_LABEL_ENABLE) |
302 | __jump_label_update(key, iter, iter_stop, JUMP_LABEL_ENABLE); | 321 | __jump_label_update(key, iter, iter_stop, JUMP_LABEL_ENABLE); |
303 | } | 322 | } |
304 | 323 | ||
@@ -310,14 +329,14 @@ static void jump_label_del_module(struct module *mod) | |||
310 | struct jump_entry *iter_start = mod->jump_entries; | 329 | struct jump_entry *iter_start = mod->jump_entries; |
311 | struct jump_entry *iter_stop = iter_start + mod->num_jump_entries; | 330 | struct jump_entry *iter_stop = iter_start + mod->num_jump_entries; |
312 | struct jump_entry *iter; | 331 | struct jump_entry *iter; |
313 | struct jump_label_key *key = NULL; | 332 | struct static_key *key = NULL; |
314 | struct jump_label_mod *jlm, **prev; | 333 | struct static_key_mod *jlm, **prev; |
315 | 334 | ||
316 | for (iter = iter_start; iter < iter_stop; iter++) { | 335 | for (iter = iter_start; iter < iter_stop; iter++) { |
317 | if (iter->key == (jump_label_t)(unsigned long)key) | 336 | if (iter->key == (jump_label_t)(unsigned long)key) |
318 | continue; | 337 | continue; |
319 | 338 | ||
320 | key = (struct jump_label_key *)(unsigned long)iter->key; | 339 | key = (struct static_key *)(unsigned long)iter->key; |
321 | 340 | ||
322 | if (__module_address(iter->key) == mod) | 341 | if (__module_address(iter->key) == mod) |
323 | continue; | 342 | continue; |
@@ -419,9 +438,10 @@ int jump_label_text_reserved(void *start, void *end) | |||
419 | return ret; | 438 | return ret; |
420 | } | 439 | } |
421 | 440 | ||
422 | static void jump_label_update(struct jump_label_key *key, int enable) | 441 | static void jump_label_update(struct static_key *key, int enable) |
423 | { | 442 | { |
424 | struct jump_entry *entry = key->entries, *stop = __stop___jump_table; | 443 | struct jump_entry *stop = __stop___jump_table; |
444 | struct jump_entry *entry = jump_label_get_entries(key); | ||
425 | 445 | ||
426 | #ifdef CONFIG_MODULES | 446 | #ifdef CONFIG_MODULES |
427 | struct module *mod = __module_address((unsigned long)key); | 447 | struct module *mod = __module_address((unsigned long)key); |
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 5255c9d2e053..112c6824476b 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c | |||
@@ -162,13 +162,13 @@ static int sched_feat_show(struct seq_file *m, void *v) | |||
162 | 162 | ||
163 | #ifdef HAVE_JUMP_LABEL | 163 | #ifdef HAVE_JUMP_LABEL |
164 | 164 | ||
165 | #define jump_label_key__true jump_label_key_enabled | 165 | #define jump_label_key__true STATIC_KEY_INIT_TRUE |
166 | #define jump_label_key__false jump_label_key_disabled | 166 | #define jump_label_key__false STATIC_KEY_INIT_FALSE |
167 | 167 | ||
168 | #define SCHED_FEAT(name, enabled) \ | 168 | #define SCHED_FEAT(name, enabled) \ |
169 | jump_label_key__##enabled , | 169 | jump_label_key__##enabled , |
170 | 170 | ||
171 | struct jump_label_key sched_feat_keys[__SCHED_FEAT_NR] = { | 171 | struct static_key sched_feat_keys[__SCHED_FEAT_NR] = { |
172 | #include "features.h" | 172 | #include "features.h" |
173 | }; | 173 | }; |
174 | 174 | ||
@@ -176,14 +176,14 @@ struct jump_label_key sched_feat_keys[__SCHED_FEAT_NR] = { | |||
176 | 176 | ||
177 | static void sched_feat_disable(int i) | 177 | static void sched_feat_disable(int i) |
178 | { | 178 | { |
179 | if (jump_label_enabled(&sched_feat_keys[i])) | 179 | if (static_key_enabled(&sched_feat_keys[i])) |
180 | jump_label_dec(&sched_feat_keys[i]); | 180 | static_key_slow_dec(&sched_feat_keys[i]); |
181 | } | 181 | } |
182 | 182 | ||
183 | static void sched_feat_enable(int i) | 183 | static void sched_feat_enable(int i) |
184 | { | 184 | { |
185 | if (!jump_label_enabled(&sched_feat_keys[i])) | 185 | if (!static_key_enabled(&sched_feat_keys[i])) |
186 | jump_label_inc(&sched_feat_keys[i]); | 186 | static_key_slow_inc(&sched_feat_keys[i]); |
187 | } | 187 | } |
188 | #else | 188 | #else |
189 | static void sched_feat_disable(int i) { }; | 189 | static void sched_feat_disable(int i) { }; |
@@ -894,7 +894,7 @@ static void update_rq_clock_task(struct rq *rq, s64 delta) | |||
894 | delta -= irq_delta; | 894 | delta -= irq_delta; |
895 | #endif | 895 | #endif |
896 | #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING | 896 | #ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING |
897 | if (static_branch((¶virt_steal_rq_enabled))) { | 897 | if (static_key_false((¶virt_steal_rq_enabled))) { |
898 | u64 st; | 898 | u64 st; |
899 | 899 | ||
900 | steal = paravirt_steal_clock(cpu_of(rq)); | 900 | steal = paravirt_steal_clock(cpu_of(rq)); |
@@ -2756,7 +2756,7 @@ void account_idle_time(cputime_t cputime) | |||
2756 | static __always_inline bool steal_account_process_tick(void) | 2756 | static __always_inline bool steal_account_process_tick(void) |
2757 | { | 2757 | { |
2758 | #ifdef CONFIG_PARAVIRT | 2758 | #ifdef CONFIG_PARAVIRT |
2759 | if (static_branch(¶virt_steal_enabled)) { | 2759 | if (static_key_false(¶virt_steal_enabled)) { |
2760 | u64 steal, st = 0; | 2760 | u64 steal, st = 0; |
2761 | 2761 | ||
2762 | steal = paravirt_steal_clock(smp_processor_id()); | 2762 | steal = paravirt_steal_clock(smp_processor_id()); |
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 7c6414fc669d..423547ada38a 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c | |||
@@ -1399,20 +1399,20 @@ entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr, int queued) | |||
1399 | #ifdef CONFIG_CFS_BANDWIDTH | 1399 | #ifdef CONFIG_CFS_BANDWIDTH |
1400 | 1400 | ||
1401 | #ifdef HAVE_JUMP_LABEL | 1401 | #ifdef HAVE_JUMP_LABEL |
1402 | static struct jump_label_key __cfs_bandwidth_used; | 1402 | static struct static_key __cfs_bandwidth_used; |
1403 | 1403 | ||
1404 | static inline bool cfs_bandwidth_used(void) | 1404 | static inline bool cfs_bandwidth_used(void) |
1405 | { | 1405 | { |
1406 | return static_branch(&__cfs_bandwidth_used); | 1406 | return static_key_false(&__cfs_bandwidth_used); |
1407 | } | 1407 | } |
1408 | 1408 | ||
1409 | void account_cfs_bandwidth_used(int enabled, int was_enabled) | 1409 | void account_cfs_bandwidth_used(int enabled, int was_enabled) |
1410 | { | 1410 | { |
1411 | /* only need to count groups transitioning between enabled/!enabled */ | 1411 | /* only need to count groups transitioning between enabled/!enabled */ |
1412 | if (enabled && !was_enabled) | 1412 | if (enabled && !was_enabled) |
1413 | jump_label_inc(&__cfs_bandwidth_used); | 1413 | static_key_slow_inc(&__cfs_bandwidth_used); |
1414 | else if (!enabled && was_enabled) | 1414 | else if (!enabled && was_enabled) |
1415 | jump_label_dec(&__cfs_bandwidth_used); | 1415 | static_key_slow_dec(&__cfs_bandwidth_used); |
1416 | } | 1416 | } |
1417 | #else /* HAVE_JUMP_LABEL */ | 1417 | #else /* HAVE_JUMP_LABEL */ |
1418 | static bool cfs_bandwidth_used(void) | 1418 | static bool cfs_bandwidth_used(void) |
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 98c0c2623db8..b4cd6d8ea150 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h | |||
@@ -611,7 +611,7 @@ static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu) | |||
611 | * Tunables that become constants when CONFIG_SCHED_DEBUG is off: | 611 | * Tunables that become constants when CONFIG_SCHED_DEBUG is off: |
612 | */ | 612 | */ |
613 | #ifdef CONFIG_SCHED_DEBUG | 613 | #ifdef CONFIG_SCHED_DEBUG |
614 | # include <linux/jump_label.h> | 614 | # include <linux/static_key.h> |
615 | # define const_debug __read_mostly | 615 | # define const_debug __read_mostly |
616 | #else | 616 | #else |
617 | # define const_debug const | 617 | # define const_debug const |
@@ -630,18 +630,18 @@ enum { | |||
630 | #undef SCHED_FEAT | 630 | #undef SCHED_FEAT |
631 | 631 | ||
632 | #if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL) | 632 | #if defined(CONFIG_SCHED_DEBUG) && defined(HAVE_JUMP_LABEL) |
633 | static __always_inline bool static_branch__true(struct jump_label_key *key) | 633 | static __always_inline bool static_branch__true(struct static_key *key) |
634 | { | 634 | { |
635 | return likely(static_branch(key)); /* Not out of line branch. */ | 635 | return static_key_true(key); /* Not out of line branch. */ |
636 | } | 636 | } |
637 | 637 | ||
638 | static __always_inline bool static_branch__false(struct jump_label_key *key) | 638 | static __always_inline bool static_branch__false(struct static_key *key) |
639 | { | 639 | { |
640 | return unlikely(static_branch(key)); /* Out of line branch. */ | 640 | return static_key_false(key); /* Out of line branch. */ |
641 | } | 641 | } |
642 | 642 | ||
643 | #define SCHED_FEAT(name, enabled) \ | 643 | #define SCHED_FEAT(name, enabled) \ |
644 | static __always_inline bool static_branch_##name(struct jump_label_key *key) \ | 644 | static __always_inline bool static_branch_##name(struct static_key *key) \ |
645 | { \ | 645 | { \ |
646 | return static_branch__##enabled(key); \ | 646 | return static_branch__##enabled(key); \ |
647 | } | 647 | } |
@@ -650,7 +650,7 @@ static __always_inline bool static_branch_##name(struct jump_label_key *key) \ | |||
650 | 650 | ||
651 | #undef SCHED_FEAT | 651 | #undef SCHED_FEAT |
652 | 652 | ||
653 | extern struct jump_label_key sched_feat_keys[__SCHED_FEAT_NR]; | 653 | extern struct static_key sched_feat_keys[__SCHED_FEAT_NR]; |
654 | #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x])) | 654 | #define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x])) |
655 | #else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */ | 655 | #else /* !(SCHED_DEBUG && HAVE_JUMP_LABEL) */ |
656 | #define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) | 656 | #define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x)) |
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index f1539decd99d..d96ba22dabfa 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c | |||
@@ -25,7 +25,7 @@ | |||
25 | #include <linux/err.h> | 25 | #include <linux/err.h> |
26 | #include <linux/slab.h> | 26 | #include <linux/slab.h> |
27 | #include <linux/sched.h> | 27 | #include <linux/sched.h> |
28 | #include <linux/jump_label.h> | 28 | #include <linux/static_key.h> |
29 | 29 | ||
30 | extern struct tracepoint * const __start___tracepoints_ptrs[]; | 30 | extern struct tracepoint * const __start___tracepoints_ptrs[]; |
31 | extern struct tracepoint * const __stop___tracepoints_ptrs[]; | 31 | extern struct tracepoint * const __stop___tracepoints_ptrs[]; |
@@ -256,9 +256,9 @@ static void set_tracepoint(struct tracepoint_entry **entry, | |||
256 | { | 256 | { |
257 | WARN_ON(strcmp((*entry)->name, elem->name) != 0); | 257 | WARN_ON(strcmp((*entry)->name, elem->name) != 0); |
258 | 258 | ||
259 | if (elem->regfunc && !jump_label_enabled(&elem->key) && active) | 259 | if (elem->regfunc && !static_key_enabled(&elem->key) && active) |
260 | elem->regfunc(); | 260 | elem->regfunc(); |
261 | else if (elem->unregfunc && jump_label_enabled(&elem->key) && !active) | 261 | else if (elem->unregfunc && static_key_enabled(&elem->key) && !active) |
262 | elem->unregfunc(); | 262 | elem->unregfunc(); |
263 | 263 | ||
264 | /* | 264 | /* |
@@ -269,10 +269,10 @@ static void set_tracepoint(struct tracepoint_entry **entry, | |||
269 | * is used. | 269 | * is used. |
270 | */ | 270 | */ |
271 | rcu_assign_pointer(elem->funcs, (*entry)->funcs); | 271 | rcu_assign_pointer(elem->funcs, (*entry)->funcs); |
272 | if (active && !jump_label_enabled(&elem->key)) | 272 | if (active && !static_key_enabled(&elem->key)) |
273 | jump_label_inc(&elem->key); | 273 | static_key_slow_inc(&elem->key); |
274 | else if (!active && jump_label_enabled(&elem->key)) | 274 | else if (!active && static_key_enabled(&elem->key)) |
275 | jump_label_dec(&elem->key); | 275 | static_key_slow_dec(&elem->key); |
276 | } | 276 | } |
277 | 277 | ||
278 | /* | 278 | /* |
@@ -283,11 +283,11 @@ static void set_tracepoint(struct tracepoint_entry **entry, | |||
283 | */ | 283 | */ |
284 | static void disable_tracepoint(struct tracepoint *elem) | 284 | static void disable_tracepoint(struct tracepoint *elem) |
285 | { | 285 | { |
286 | if (elem->unregfunc && jump_label_enabled(&elem->key)) | 286 | if (elem->unregfunc && static_key_enabled(&elem->key)) |
287 | elem->unregfunc(); | 287 | elem->unregfunc(); |
288 | 288 | ||
289 | if (jump_label_enabled(&elem->key)) | 289 | if (static_key_enabled(&elem->key)) |
290 | jump_label_dec(&elem->key); | 290 | static_key_slow_dec(&elem->key); |
291 | rcu_assign_pointer(elem->funcs, NULL); | 291 | rcu_assign_pointer(elem->funcs, NULL); |
292 | } | 292 | } |
293 | 293 | ||
diff --git a/net/core/dev.c b/net/core/dev.c index 115dee1d985d..da7ce7f0e566 100644 --- a/net/core/dev.c +++ b/net/core/dev.c | |||
@@ -134,7 +134,7 @@ | |||
134 | #include <linux/inetdevice.h> | 134 | #include <linux/inetdevice.h> |
135 | #include <linux/cpu_rmap.h> | 135 | #include <linux/cpu_rmap.h> |
136 | #include <linux/net_tstamp.h> | 136 | #include <linux/net_tstamp.h> |
137 | #include <linux/jump_label.h> | 137 | #include <linux/static_key.h> |
138 | #include <net/flow_keys.h> | 138 | #include <net/flow_keys.h> |
139 | 139 | ||
140 | #include "net-sysfs.h" | 140 | #include "net-sysfs.h" |
@@ -1441,11 +1441,11 @@ int call_netdevice_notifiers(unsigned long val, struct net_device *dev) | |||
1441 | } | 1441 | } |
1442 | EXPORT_SYMBOL(call_netdevice_notifiers); | 1442 | EXPORT_SYMBOL(call_netdevice_notifiers); |
1443 | 1443 | ||
1444 | static struct jump_label_key netstamp_needed __read_mostly; | 1444 | static struct static_key netstamp_needed __read_mostly; |
1445 | #ifdef HAVE_JUMP_LABEL | 1445 | #ifdef HAVE_JUMP_LABEL |
1446 | /* We are not allowed to call jump_label_dec() from irq context | 1446 | /* We are not allowed to call static_key_slow_dec() from irq context |
1447 | * If net_disable_timestamp() is called from irq context, defer the | 1447 | * If net_disable_timestamp() is called from irq context, defer the |
1448 | * jump_label_dec() calls. | 1448 | * static_key_slow_dec() calls. |
1449 | */ | 1449 | */ |
1450 | static atomic_t netstamp_needed_deferred; | 1450 | static atomic_t netstamp_needed_deferred; |
1451 | #endif | 1451 | #endif |
@@ -1457,12 +1457,12 @@ void net_enable_timestamp(void) | |||
1457 | 1457 | ||
1458 | if (deferred) { | 1458 | if (deferred) { |
1459 | while (--deferred) | 1459 | while (--deferred) |
1460 | jump_label_dec(&netstamp_needed); | 1460 | static_key_slow_dec(&netstamp_needed); |
1461 | return; | 1461 | return; |
1462 | } | 1462 | } |
1463 | #endif | 1463 | #endif |
1464 | WARN_ON(in_interrupt()); | 1464 | WARN_ON(in_interrupt()); |
1465 | jump_label_inc(&netstamp_needed); | 1465 | static_key_slow_inc(&netstamp_needed); |
1466 | } | 1466 | } |
1467 | EXPORT_SYMBOL(net_enable_timestamp); | 1467 | EXPORT_SYMBOL(net_enable_timestamp); |
1468 | 1468 | ||
@@ -1474,19 +1474,19 @@ void net_disable_timestamp(void) | |||
1474 | return; | 1474 | return; |
1475 | } | 1475 | } |
1476 | #endif | 1476 | #endif |
1477 | jump_label_dec(&netstamp_needed); | 1477 | static_key_slow_dec(&netstamp_needed); |
1478 | } | 1478 | } |
1479 | EXPORT_SYMBOL(net_disable_timestamp); | 1479 | EXPORT_SYMBOL(net_disable_timestamp); |
1480 | 1480 | ||
1481 | static inline void net_timestamp_set(struct sk_buff *skb) | 1481 | static inline void net_timestamp_set(struct sk_buff *skb) |
1482 | { | 1482 | { |
1483 | skb->tstamp.tv64 = 0; | 1483 | skb->tstamp.tv64 = 0; |
1484 | if (static_branch(&netstamp_needed)) | 1484 | if (static_key_false(&netstamp_needed)) |
1485 | __net_timestamp(skb); | 1485 | __net_timestamp(skb); |
1486 | } | 1486 | } |
1487 | 1487 | ||
1488 | #define net_timestamp_check(COND, SKB) \ | 1488 | #define net_timestamp_check(COND, SKB) \ |
1489 | if (static_branch(&netstamp_needed)) { \ | 1489 | if (static_key_false(&netstamp_needed)) { \ |
1490 | if ((COND) && !(SKB)->tstamp.tv64) \ | 1490 | if ((COND) && !(SKB)->tstamp.tv64) \ |
1491 | __net_timestamp(SKB); \ | 1491 | __net_timestamp(SKB); \ |
1492 | } \ | 1492 | } \ |
@@ -2660,7 +2660,7 @@ EXPORT_SYMBOL(__skb_get_rxhash); | |||
2660 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; | 2660 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
2661 | EXPORT_SYMBOL(rps_sock_flow_table); | 2661 | EXPORT_SYMBOL(rps_sock_flow_table); |
2662 | 2662 | ||
2663 | struct jump_label_key rps_needed __read_mostly; | 2663 | struct static_key rps_needed __read_mostly; |
2664 | 2664 | ||
2665 | static struct rps_dev_flow * | 2665 | static struct rps_dev_flow * |
2666 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, | 2666 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, |
@@ -2945,7 +2945,7 @@ int netif_rx(struct sk_buff *skb) | |||
2945 | 2945 | ||
2946 | trace_netif_rx(skb); | 2946 | trace_netif_rx(skb); |
2947 | #ifdef CONFIG_RPS | 2947 | #ifdef CONFIG_RPS |
2948 | if (static_branch(&rps_needed)) { | 2948 | if (static_key_false(&rps_needed)) { |
2949 | struct rps_dev_flow voidflow, *rflow = &voidflow; | 2949 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
2950 | int cpu; | 2950 | int cpu; |
2951 | 2951 | ||
@@ -3309,7 +3309,7 @@ int netif_receive_skb(struct sk_buff *skb) | |||
3309 | return NET_RX_SUCCESS; | 3309 | return NET_RX_SUCCESS; |
3310 | 3310 | ||
3311 | #ifdef CONFIG_RPS | 3311 | #ifdef CONFIG_RPS |
3312 | if (static_branch(&rps_needed)) { | 3312 | if (static_key_false(&rps_needed)) { |
3313 | struct rps_dev_flow voidflow, *rflow = &voidflow; | 3313 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
3314 | int cpu, ret; | 3314 | int cpu, ret; |
3315 | 3315 | ||
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index a1727cda03d7..495586232aa1 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c | |||
@@ -608,10 +608,10 @@ static ssize_t store_rps_map(struct netdev_rx_queue *queue, | |||
608 | spin_unlock(&rps_map_lock); | 608 | spin_unlock(&rps_map_lock); |
609 | 609 | ||
610 | if (map) | 610 | if (map) |
611 | jump_label_inc(&rps_needed); | 611 | static_key_slow_inc(&rps_needed); |
612 | if (old_map) { | 612 | if (old_map) { |
613 | kfree_rcu(old_map, rcu); | 613 | kfree_rcu(old_map, rcu); |
614 | jump_label_dec(&rps_needed); | 614 | static_key_slow_dec(&rps_needed); |
615 | } | 615 | } |
616 | free_cpumask_var(mask); | 616 | free_cpumask_var(mask); |
617 | return len; | 617 | return len; |
diff --git a/net/core/sock.c b/net/core/sock.c index 3e81fd2e3c75..3a4e5817a2a7 100644 --- a/net/core/sock.c +++ b/net/core/sock.c | |||
@@ -111,7 +111,7 @@ | |||
111 | #include <linux/init.h> | 111 | #include <linux/init.h> |
112 | #include <linux/highmem.h> | 112 | #include <linux/highmem.h> |
113 | #include <linux/user_namespace.h> | 113 | #include <linux/user_namespace.h> |
114 | #include <linux/jump_label.h> | 114 | #include <linux/static_key.h> |
115 | #include <linux/memcontrol.h> | 115 | #include <linux/memcontrol.h> |
116 | 116 | ||
117 | #include <asm/uaccess.h> | 117 | #include <asm/uaccess.h> |
@@ -184,7 +184,7 @@ void mem_cgroup_sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss) | |||
184 | static struct lock_class_key af_family_keys[AF_MAX]; | 184 | static struct lock_class_key af_family_keys[AF_MAX]; |
185 | static struct lock_class_key af_family_slock_keys[AF_MAX]; | 185 | static struct lock_class_key af_family_slock_keys[AF_MAX]; |
186 | 186 | ||
187 | struct jump_label_key memcg_socket_limit_enabled; | 187 | struct static_key memcg_socket_limit_enabled; |
188 | EXPORT_SYMBOL(memcg_socket_limit_enabled); | 188 | EXPORT_SYMBOL(memcg_socket_limit_enabled); |
189 | 189 | ||
190 | /* | 190 | /* |
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c index d05559d4d9cd..0c2850874254 100644 --- a/net/core/sysctl_net_core.c +++ b/net/core/sysctl_net_core.c | |||
@@ -69,9 +69,9 @@ static int rps_sock_flow_sysctl(ctl_table *table, int write, | |||
69 | if (sock_table != orig_sock_table) { | 69 | if (sock_table != orig_sock_table) { |
70 | rcu_assign_pointer(rps_sock_flow_table, sock_table); | 70 | rcu_assign_pointer(rps_sock_flow_table, sock_table); |
71 | if (sock_table) | 71 | if (sock_table) |
72 | jump_label_inc(&rps_needed); | 72 | static_key_slow_inc(&rps_needed); |
73 | if (orig_sock_table) { | 73 | if (orig_sock_table) { |
74 | jump_label_dec(&rps_needed); | 74 | static_key_slow_dec(&rps_needed); |
75 | synchronize_rcu(); | 75 | synchronize_rcu(); |
76 | vfree(orig_sock_table); | 76 | vfree(orig_sock_table); |
77 | } | 77 | } |
diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c index 49978788a9dc..602fb305365f 100644 --- a/net/ipv4/tcp_memcontrol.c +++ b/net/ipv4/tcp_memcontrol.c | |||
@@ -111,7 +111,7 @@ void tcp_destroy_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss) | |||
111 | val = res_counter_read_u64(&tcp->tcp_memory_allocated, RES_LIMIT); | 111 | val = res_counter_read_u64(&tcp->tcp_memory_allocated, RES_LIMIT); |
112 | 112 | ||
113 | if (val != RESOURCE_MAX) | 113 | if (val != RESOURCE_MAX) |
114 | jump_label_dec(&memcg_socket_limit_enabled); | 114 | static_key_slow_dec(&memcg_socket_limit_enabled); |
115 | } | 115 | } |
116 | EXPORT_SYMBOL(tcp_destroy_cgroup); | 116 | EXPORT_SYMBOL(tcp_destroy_cgroup); |
117 | 117 | ||
@@ -143,9 +143,9 @@ static int tcp_update_limit(struct mem_cgroup *memcg, u64 val) | |||
143 | net->ipv4.sysctl_tcp_mem[i]); | 143 | net->ipv4.sysctl_tcp_mem[i]); |
144 | 144 | ||
145 | if (val == RESOURCE_MAX && old_lim != RESOURCE_MAX) | 145 | if (val == RESOURCE_MAX && old_lim != RESOURCE_MAX) |
146 | jump_label_dec(&memcg_socket_limit_enabled); | 146 | static_key_slow_dec(&memcg_socket_limit_enabled); |
147 | else if (old_lim == RESOURCE_MAX && val != RESOURCE_MAX) | 147 | else if (old_lim == RESOURCE_MAX && val != RESOURCE_MAX) |
148 | jump_label_inc(&memcg_socket_limit_enabled); | 148 | static_key_slow_inc(&memcg_socket_limit_enabled); |
149 | 149 | ||
150 | return 0; | 150 | return 0; |
151 | } | 151 | } |
diff --git a/net/netfilter/core.c b/net/netfilter/core.c index b4e8ff05b301..e1b7e051332e 100644 --- a/net/netfilter/core.c +++ b/net/netfilter/core.c | |||
@@ -56,7 +56,7 @@ struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS] __read_mostly; | |||
56 | EXPORT_SYMBOL(nf_hooks); | 56 | EXPORT_SYMBOL(nf_hooks); |
57 | 57 | ||
58 | #if defined(CONFIG_JUMP_LABEL) | 58 | #if defined(CONFIG_JUMP_LABEL) |
59 | struct jump_label_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; | 59 | struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
60 | EXPORT_SYMBOL(nf_hooks_needed); | 60 | EXPORT_SYMBOL(nf_hooks_needed); |
61 | #endif | 61 | #endif |
62 | 62 | ||
@@ -77,7 +77,7 @@ int nf_register_hook(struct nf_hook_ops *reg) | |||
77 | list_add_rcu(®->list, elem->list.prev); | 77 | list_add_rcu(®->list, elem->list.prev); |
78 | mutex_unlock(&nf_hook_mutex); | 78 | mutex_unlock(&nf_hook_mutex); |
79 | #if defined(CONFIG_JUMP_LABEL) | 79 | #if defined(CONFIG_JUMP_LABEL) |
80 | jump_label_inc(&nf_hooks_needed[reg->pf][reg->hooknum]); | 80 | static_key_slow_inc(&nf_hooks_needed[reg->pf][reg->hooknum]); |
81 | #endif | 81 | #endif |
82 | return 0; | 82 | return 0; |
83 | } | 83 | } |
@@ -89,7 +89,7 @@ void nf_unregister_hook(struct nf_hook_ops *reg) | |||
89 | list_del_rcu(®->list); | 89 | list_del_rcu(®->list); |
90 | mutex_unlock(&nf_hook_mutex); | 90 | mutex_unlock(&nf_hook_mutex); |
91 | #if defined(CONFIG_JUMP_LABEL) | 91 | #if defined(CONFIG_JUMP_LABEL) |
92 | jump_label_dec(&nf_hooks_needed[reg->pf][reg->hooknum]); | 92 | static_key_slow_dec(&nf_hooks_needed[reg->pf][reg->hooknum]); |
93 | #endif | 93 | #endif |
94 | synchronize_net(); | 94 | synchronize_net(); |
95 | } | 95 | } |