diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-15 12:02:01 -0500 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-15 12:02:01 -0500 |
commit | 8f0ddf91f2aeb09602373e400cf8b403e9017210 (patch) | |
tree | b907c35c79caadafff6ad46a91614e30afd2f967 /lib/kernel_lock.c | |
parent | 050cbb09dac0402672edeaeac06094ef8ff1749a (diff) | |
parent | b5f91da0a6973bb6f9ff3b91b0e92c0773a458f3 (diff) |
Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (26 commits)
clockevents: Convert to raw_spinlock
clockevents: Make tick_device_lock static
debugobjects: Convert to raw_spinlocks
perf_event: Convert to raw_spinlock
hrtimers: Convert to raw_spinlocks
genirq: Convert irq_desc.lock to raw_spinlock
smp: Convert smplocks to raw_spinlocks
rtmutes: Convert rtmutex.lock to raw_spinlock
sched: Convert pi_lock to raw_spinlock
sched: Convert cpupri lock to raw_spinlock
sched: Convert rt_runtime_lock to raw_spinlock
sched: Convert rq->lock to raw_spinlock
plist: Make plist debugging raw_spinlock aware
bkl: Fixup core_lock fallout
locking: Cleanup the name space completely
locking: Further name space cleanups
alpha: Fix fallout from locking changes
locking: Implement new raw_spinlock
locking: Convert raw_rwlock functions to arch_rwlock
locking: Convert raw_rwlock to arch_rwlock
...
Diffstat (limited to 'lib/kernel_lock.c')
-rw-r--r-- | lib/kernel_lock.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/lib/kernel_lock.c b/lib/kernel_lock.c index 5526b46aba94..b135d04aa48a 100644 --- a/lib/kernel_lock.c +++ b/lib/kernel_lock.c | |||
@@ -23,7 +23,7 @@ | |||
23 | * | 23 | * |
24 | * Don't use in new code. | 24 | * Don't use in new code. |
25 | */ | 25 | */ |
26 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(kernel_flag); | 26 | static __cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(kernel_flag); |
27 | 27 | ||
28 | 28 | ||
29 | /* | 29 | /* |
@@ -36,12 +36,12 @@ static __cacheline_aligned_in_smp DEFINE_SPINLOCK(kernel_flag); | |||
36 | * If it successfully gets the lock, it should increment | 36 | * If it successfully gets the lock, it should increment |
37 | * the preemption count like any spinlock does. | 37 | * the preemption count like any spinlock does. |
38 | * | 38 | * |
39 | * (This works on UP too - _raw_spin_trylock will never | 39 | * (This works on UP too - do_raw_spin_trylock will never |
40 | * return false in that case) | 40 | * return false in that case) |
41 | */ | 41 | */ |
42 | int __lockfunc __reacquire_kernel_lock(void) | 42 | int __lockfunc __reacquire_kernel_lock(void) |
43 | { | 43 | { |
44 | while (!_raw_spin_trylock(&kernel_flag)) { | 44 | while (!do_raw_spin_trylock(&kernel_flag)) { |
45 | if (need_resched()) | 45 | if (need_resched()) |
46 | return -EAGAIN; | 46 | return -EAGAIN; |
47 | cpu_relax(); | 47 | cpu_relax(); |
@@ -52,27 +52,27 @@ int __lockfunc __reacquire_kernel_lock(void) | |||
52 | 52 | ||
53 | void __lockfunc __release_kernel_lock(void) | 53 | void __lockfunc __release_kernel_lock(void) |
54 | { | 54 | { |
55 | _raw_spin_unlock(&kernel_flag); | 55 | do_raw_spin_unlock(&kernel_flag); |
56 | preempt_enable_no_resched(); | 56 | preempt_enable_no_resched(); |
57 | } | 57 | } |
58 | 58 | ||
59 | /* | 59 | /* |
60 | * These are the BKL spinlocks - we try to be polite about preemption. | 60 | * These are the BKL spinlocks - we try to be polite about preemption. |
61 | * If SMP is not on (ie UP preemption), this all goes away because the | 61 | * If SMP is not on (ie UP preemption), this all goes away because the |
62 | * _raw_spin_trylock() will always succeed. | 62 | * do_raw_spin_trylock() will always succeed. |
63 | */ | 63 | */ |
64 | #ifdef CONFIG_PREEMPT | 64 | #ifdef CONFIG_PREEMPT |
65 | static inline void __lock_kernel(void) | 65 | static inline void __lock_kernel(void) |
66 | { | 66 | { |
67 | preempt_disable(); | 67 | preempt_disable(); |
68 | if (unlikely(!_raw_spin_trylock(&kernel_flag))) { | 68 | if (unlikely(!do_raw_spin_trylock(&kernel_flag))) { |
69 | /* | 69 | /* |
70 | * If preemption was disabled even before this | 70 | * If preemption was disabled even before this |
71 | * was called, there's nothing we can be polite | 71 | * was called, there's nothing we can be polite |
72 | * about - just spin. | 72 | * about - just spin. |
73 | */ | 73 | */ |
74 | if (preempt_count() > 1) { | 74 | if (preempt_count() > 1) { |
75 | _raw_spin_lock(&kernel_flag); | 75 | do_raw_spin_lock(&kernel_flag); |
76 | return; | 76 | return; |
77 | } | 77 | } |
78 | 78 | ||
@@ -82,10 +82,10 @@ static inline void __lock_kernel(void) | |||
82 | */ | 82 | */ |
83 | do { | 83 | do { |
84 | preempt_enable(); | 84 | preempt_enable(); |
85 | while (spin_is_locked(&kernel_flag)) | 85 | while (raw_spin_is_locked(&kernel_flag)) |
86 | cpu_relax(); | 86 | cpu_relax(); |
87 | preempt_disable(); | 87 | preempt_disable(); |
88 | } while (!_raw_spin_trylock(&kernel_flag)); | 88 | } while (!do_raw_spin_trylock(&kernel_flag)); |
89 | } | 89 | } |
90 | } | 90 | } |
91 | 91 | ||
@@ -96,7 +96,7 @@ static inline void __lock_kernel(void) | |||
96 | */ | 96 | */ |
97 | static inline void __lock_kernel(void) | 97 | static inline void __lock_kernel(void) |
98 | { | 98 | { |
99 | _raw_spin_lock(&kernel_flag); | 99 | do_raw_spin_lock(&kernel_flag); |
100 | } | 100 | } |
101 | #endif | 101 | #endif |
102 | 102 | ||
@@ -106,7 +106,7 @@ static inline void __unlock_kernel(void) | |||
106 | * the BKL is not covered by lockdep, so we open-code the | 106 | * the BKL is not covered by lockdep, so we open-code the |
107 | * unlocking sequence (and thus avoid the dep-chain ops): | 107 | * unlocking sequence (and thus avoid the dep-chain ops): |
108 | */ | 108 | */ |
109 | _raw_spin_unlock(&kernel_flag); | 109 | do_raw_spin_unlock(&kernel_flag); |
110 | preempt_enable(); | 110 | preempt_enable(); |
111 | } | 111 | } |
112 | 112 | ||