x86, asm: Move cmpxchg emulation code to arch/x86/lib

Move cmpxchg emulation code from arch/x86/kernel/cpu (which is
otherwise CPU identification) to arch/x86/lib, where other emulation
code lives already.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
LKML-Reference: <AANLkTikAmaDPji-TVDarmG1yD=fwbffcsmEU=YEuP+8r@mail.gmail.com>

diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 3a785da34b6f981dd678f217c5f75f728a30d8ae..c47c43914ba72949674d57e7c5e93294e9d70ed7 100644 (file)
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -16,7 +16,7 @@ obj-y                 := intel_cacheinfo.o addon_cpuid_features.o
 obj-y                  += proc.o capflags.o powerflags.o common.o
 obj-y                  += vmware.o hypervisor.o sched.o mshyperv.o
 
-obj-$(CONFIG_X86_32)   += bugs.o cmpxchg.o
+obj-$(CONFIG_X86_32)   += bugs.o
 obj-$(CONFIG_X86_64)   += bugs_64.o
 
 obj-$(CONFIG_CPU_SUP_INTEL)            += intel.o

diff --git a/arch/x86/kernel/cpu/cmpxchg.c b/arch/x86/kernel/cpu/cmpxchg.c
deleted file mode 100644 (file)
index 2056ccf..0000000
--- a/arch/x86/kernel/cpu/cmpxchg.c
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * cmpxchg*() fallbacks for CPU not supporting these instructions
- */
-
-#include <linux/kernel.h>
-#include <linux/smp.h>
-#include <linux/module.h>
-
-#ifndef CONFIG_X86_CMPXCHG
-unsigned long cmpxchg_386_u8(volatile void *ptr, u8 old, u8 new)
-{
-       u8 prev;
-       unsigned long flags;
-
-       /* Poor man's cmpxchg for 386. Unsuitable for SMP */
-       local_irq_save(flags);
-       prev = *(u8 *)ptr;
-       if (prev == old)
-               *(u8 *)ptr = new;
-       local_irq_restore(flags);
-       return prev;
-}
-EXPORT_SYMBOL(cmpxchg_386_u8);
-
-unsigned long cmpxchg_386_u16(volatile void *ptr, u16 old, u16 new)
-{
-       u16 prev;
-       unsigned long flags;
-
-       /* Poor man's cmpxchg for 386. Unsuitable for SMP */
-       local_irq_save(flags);
-       prev = *(u16 *)ptr;
-       if (prev == old)
-               *(u16 *)ptr = new;
-       local_irq_restore(flags);
-       return prev;
-}
-EXPORT_SYMBOL(cmpxchg_386_u16);
-
-unsigned long cmpxchg_386_u32(volatile void *ptr, u32 old, u32 new)
-{
-       u32 prev;
-       unsigned long flags;
-
-       /* Poor man's cmpxchg for 386. Unsuitable for SMP */
-       local_irq_save(flags);
-       prev = *(u32 *)ptr;
-       if (prev == old)
-               *(u32 *)ptr = new;
-       local_irq_restore(flags);
-       return prev;
-}
-EXPORT_SYMBOL(cmpxchg_386_u32);
-#endif
-
-#ifndef CONFIG_X86_CMPXCHG64
-unsigned long long cmpxchg_486_u64(volatile void *ptr, u64 old, u64 new)
-{
-       u64 prev;
-       unsigned long flags;
-
-       /* Poor man's cmpxchg8b for 386 and 486. Unsuitable for SMP */
-       local_irq_save(flags);
-       prev = *(u64 *)ptr;
-       if (prev == old)
-               *(u64 *)ptr = new;
-       local_irq_restore(flags);
-       return prev;
-}
-EXPORT_SYMBOL(cmpxchg_486_u64);
-#endif
-

diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index f871e04b6965b828045b08d183dadd0c2aaa487f..e10cf070ede0bbb6b169dbd76289054c32becc18 100644 (file)
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -30,6 +30,7 @@ ifeq ($(CONFIG_X86_32),y)
         lib-y += checksum_32.o
         lib-y += strstr_32.o
         lib-y += semaphore_32.o string_32.o
+        lib-y += cmpxchg.o
 ifneq ($(CONFIG_X86_CMPXCHG64),y)
         lib-y += cmpxchg8b_emu.o atomic64_386_32.o
 endif

diff --git a/arch/x86/lib/cmpxchg.c b/arch/x86/lib/cmpxchg.c
new file mode 100644 (file)
index 0000000..2056ccf
--- /dev/null
+++ b/arch/x86/lib/cmpxchg.c
@@ -0,0 +1,72 @@
+/*
+ * cmpxchg*() fallbacks for CPU not supporting these instructions
+ */
+
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/module.h>
+
+#ifndef CONFIG_X86_CMPXCHG
+unsigned long cmpxchg_386_u8(volatile void *ptr, u8 old, u8 new)
+{
+       u8 prev;
+       unsigned long flags;
+
+       /* Poor man's cmpxchg for 386. Unsuitable for SMP */
+       local_irq_save(flags);
+       prev = *(u8 *)ptr;
+       if (prev == old)
+               *(u8 *)ptr = new;
+       local_irq_restore(flags);
+       return prev;
+}
+EXPORT_SYMBOL(cmpxchg_386_u8);
+
+unsigned long cmpxchg_386_u16(volatile void *ptr, u16 old, u16 new)
+{
+       u16 prev;
+       unsigned long flags;
+
+       /* Poor man's cmpxchg for 386. Unsuitable for SMP */
+       local_irq_save(flags);
+       prev = *(u16 *)ptr;
+       if (prev == old)
+               *(u16 *)ptr = new;
+       local_irq_restore(flags);
+       return prev;
+}
+EXPORT_SYMBOL(cmpxchg_386_u16);
+
+unsigned long cmpxchg_386_u32(volatile void *ptr, u32 old, u32 new)
+{
+       u32 prev;
+       unsigned long flags;
+
+       /* Poor man's cmpxchg for 386. Unsuitable for SMP */
+       local_irq_save(flags);
+       prev = *(u32 *)ptr;
+       if (prev == old)
+               *(u32 *)ptr = new;
+       local_irq_restore(flags);
+       return prev;
+}
+EXPORT_SYMBOL(cmpxchg_386_u32);
+#endif
+
+#ifndef CONFIG_X86_CMPXCHG64
+unsigned long long cmpxchg_486_u64(volatile void *ptr, u64 old, u64 new)
+{
+       u64 prev;
+       unsigned long flags;
+
+       /* Poor man's cmpxchg8b for 386 and 486. Unsuitable for SMP */
+       local_irq_save(flags);
+       prev = *(u64 *)ptr;
+       if (prev == old)
+               *(u64 *)ptr = new;
+       local_irq_restore(flags);
+       return prev;
+}
+EXPORT_SYMBOL(cmpxchg_486_u64);
+#endif
+