Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Use .cfi_sections for assembly code
  x86-64: Reduce SMP locks table size
  x86, asm: Introduce and use percpu_inc()

8 files changed, 71 insertions, 29 deletions

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 0a43dc515e4c..8aa1b59b9074 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -95,8 +95,9 @@ sp-$(CONFIG_X86_64) := rsp
 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
 # is .cfi_signal_frame supported too?
 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
-KBUILD_AFLAGS += $(cfi) $(cfi-sigframe)
-KBUILD_CFLAGS += $(cfi) $(cfi-sigframe)
+cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
+KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections)
+KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections)
 
 LDFLAGS := -m elf_$(UTS_MACHINE)
 
diff --git a/arch/x86/include/asm/alternative-asm.h b/arch/x86/include/asm/alternative-asm.h
index b97f786a48d5..a63a68be1cce 100644
--- a/arch/x86/include/asm/alternative-asm.h
+++ b/arch/x86/include/asm/alternative-asm.h
@@ -6,8 +6,8 @@
         .macro LOCK_PREFIX
 1:      lock
         .section .smp_locks,"a"
-        _ASM_ALIGN
-        _ASM_PTR 1b
+        .balign 4
+        .long 1b - .
         .previous
         .endm
 #else
diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h
index b09ec55650b3..714bf2417284 100644
--- a/arch/x86/include/asm/alternative.h
+++ b/arch/x86/include/asm/alternative.h
@@ -30,8 +30,8 @@
 #ifdef CONFIG_SMP
 #define LOCK_PREFIX \
                 ".section .smp_locks,\"a\"\n"   \
-                _ASM_ALIGN "\n"                 \
-                _ASM_PTR "661f\n" /* address */ \
+                ".balign 4\n"                   \
+                ".long 661f - .\n" /* offset */ \
                 ".previous\n"                   \
                 "661:\n\tlock; "
 
diff --git a/arch/x86/include/asm/dwarf2.h b/arch/x86/include/asm/dwarf2.h
index ae6253ab9029..733f7e91e7a9 100644
--- a/arch/x86/include/asm/dwarf2.h
+++ b/arch/x86/include/asm/dwarf2.h
@@ -34,6 +34,18 @@
 #define CFI_SIGNAL_FRAME
 #endif
 
+#if defined(CONFIG_AS_CFI_SECTIONS) && defined(__ASSEMBLY__)
+        /*
+         * Emit CFI data in .debug_frame sections, not .eh_frame sections.
+         * The latter we currently just discard since we don't do DWARF
+         * unwinding at runtime.  So only the offline DWARF information is
+         * useful to anyone.  Note we should not use this directive if this
+         * file is used in the vDSO assembly, or if vmlinux.lds.S gets
+         * changed so it doesn't discard .eh_frame.
+         */
+        .cfi_sections .debug_frame
+#endif
+
 #else
 
 /*
diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index 0f8576427cfe..aeab29aee617 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -35,7 +35,7 @@ DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
 
 #define __ARCH_IRQ_STAT
 
-#define inc_irq_stat(member)    percpu_add(irq_stat.member, 1)
+#define inc_irq_stat(member)    percpu_inc(irq_stat.member)
 
 #define local_softirq_pending() percpu_read(irq_stat.__softirq_pending)
 
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 66a272dfd8b8..0ec6d12d84e6 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -190,6 +190,29 @@ do {									\
         pfo_ret__;                                      \
 })
 
+#define percpu_unary_op(op, var)                        \
+({                                                      \
+        switch (sizeof(var)) {                          \
+        case 1:                                         \
+                asm(op "b "__percpu_arg(0)              \
+                    : "+m" (var));                      \
+                break;                                  \
+        case 2:                                         \
+                asm(op "w "__percpu_arg(0)              \
+                    : "+m" (var));                      \
+                break;                                  \
+        case 4:                                         \
+                asm(op "l "__percpu_arg(0)              \
+                    : "+m" (var));                      \
+                break;                                  \
+        case 8:                                         \
+                asm(op "q "__percpu_arg(0)              \
+                    : "+m" (var));                      \
+                break;                                  \
+        default: __bad_percpu_size();                   \
+        }                                               \
+})
+
 /*
  * percpu_read() makes gcc load the percpu variable every time it is
  * accessed while percpu_read_stable() allows the value to be cached.
@@ -207,6 +230,7 @@ do {									\
 #define percpu_and(var, val)            percpu_to_op("and", var, val)
 #define percpu_or(var, val)             percpu_to_op("or", var, val)
 #define percpu_xor(var, val)            percpu_to_op("xor", var, val)
+#define percpu_inc(var)         percpu_unary_op("inc", var)
 
 #define __this_cpu_read_1(pcp)          percpu_from_op("mov", (pcp), "m"(pcp))
 #define __this_cpu_read_2(pcp)          percpu_from_op("mov", (pcp), "m"(pcp))
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 1a160d5d44d0..936738427223 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -194,7 +194,7 @@ static void __init_or_module add_nops(void *insns, unsigned int len)
 }
 
 extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
-extern u8 *__smp_locks[], *__smp_locks_end[];
+extern s32 __smp_locks[], __smp_locks_end[];
 static void *text_poke_early(void *addr, const void *opcode, size_t len);
 
 /* Replace instructions with better alternatives for this CPU type.
@@ -235,37 +235,39 @@ void __init_or_module apply_alternatives(struct alt_instr *start,
 
 #ifdef CONFIG_SMP
 
-static void alternatives_smp_lock(u8 **start, u8 **end, u8 *text, u8 *text_end)
+static void alternatives_smp_lock(const s32 *start, const s32 *end,
+                                  u8 *text, u8 *text_end)
 {
-        u8 **ptr;
+        const s32 *poff;
 
         mutex_lock(&text_mutex);
-        for (ptr = start; ptr < end; ptr++) {
-                if (*ptr < text)
-                        continue;
-                if (*ptr > text_end)
+        for (poff = start; poff < end; poff++) {
+                u8 *ptr = (u8 *)poff + *poff;
+
+                if (!*poff || ptr < text || ptr >= text_end)
                         continue;
                 /* turn DS segment override prefix into lock prefix */
-                text_poke(*ptr, ((unsigned char []){0xf0}), 1);
+                text_poke(ptr, ((unsigned char []){0xf0}), 1);
         };
         mutex_unlock(&text_mutex);
 }
 
-static void alternatives_smp_unlock(u8 **start, u8 **end, u8 *text, u8 *text_end)
+static void alternatives_smp_unlock(const s32 *start, const s32 *end,
+                                    u8 *text, u8 *text_end)
 {
-        u8 **ptr;
+        const s32 *poff;
 
         if (noreplace_smp)
                 return;
 
         mutex_lock(&text_mutex);
-        for (ptr = start; ptr < end; ptr++) {
-                if (*ptr < text)
-                        continue;
-                if (*ptr > text_end)
+        for (poff = start; poff < end; poff++) {
+                u8 *ptr = (u8 *)poff + *poff;
+
+                if (!*poff || ptr < text || ptr >= text_end)
                         continue;
                 /* turn lock prefix into DS segment override prefix */
-                text_poke(*ptr, ((unsigned char []){0x3E}), 1);
+                text_poke(ptr, ((unsigned char []){0x3E}), 1);
         };
         mutex_unlock(&text_mutex);
 }
@@ -276,8 +278,8 @@ struct smp_alt_module {
         char            *name;
 
         /* ptrs to lock prefixes */
-        u8              **locks;
-        u8              **locks_end;
+        const s32       *locks;
+        const s32       *locks_end;
 
         /* .text segment, needed to avoid patching init code ;) */
         u8              *text;
@@ -398,16 +400,19 @@ void alternatives_smp_switch(int smp)
 int alternatives_text_reserved(void *start, void *end)
 {
         struct smp_alt_module *mod;
-        u8 **ptr;
+        const s32 *poff;
         u8 *text_start = start;
         u8 *text_end = end;
 
         list_for_each_entry(mod, &smp_alt_modules, next) {
                 if (mod->text > text_end || mod->text_end < text_start)
                         continue;
-                for (ptr = mod->locks; ptr < mod->locks_end; ptr++)
-                        if (text_start <= *ptr && text_end >= *ptr)
+                for (poff = mod->locks; poff < mod->locks_end; poff++) {
+                        const u8 *ptr = (const u8 *)poff + *poff;
+
+                        if (text_start <= ptr && text_end > ptr)
                                 return 1;
+                }
         }
 
         return 0;
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 8a6f0afa767e..7a355ddcc64b 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -539,7 +539,7 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
         struct mce m;
         int i;
 
-        __get_cpu_var(mce_poll_count)++;
+        percpu_inc(mce_poll_count);
 
         mce_setup(&m);
 
@@ -934,7 +934,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)
 
         atomic_inc(&mce_entry);
 
-        __get_cpu_var(mce_exception_count)++;
+        percpu_inc(mce_exception_count);
 
         if (notify_die(DIE_NMI, "machine check", regs, error_code,
                            18, SIGKILL) == NOTIFY_STOP)