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authorLinus Torvalds <torvalds@linux-foundation.org>2012-04-13 19:44:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-13 19:44:36 -0700
commit668ce0ac707719d866af7e432e518af7b4c575ad (patch)
tree56981174aa46721ef0b4d3710f990153e22dda3a /arch/alpha/include/asm/cmpxchg.h
parenta1c0cad352520206305b1a3c2658097721454855 (diff)
parentef1f0982540e5f79c8bbf3675bbc0a9734dba3fc (diff)
Merge branch 'systemh-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
Pull system.h fixups for less common arch's from Paul Gortmaker: "Here is what is hopefully the last of the system.h related fixups. The fixes for Alpha and ia64 are code relocations consistent with what was done for the more mainstream architectures. Note that the diffstat lines removed vs lines added are not the same since I've fixed some of the whitespace issues in the relocated code blocks. However they are functionally the same. Compile tested locally, plus these two have been in linux-next for a while. There is also a trivial one line system.h related fix for the Tilera arch from Chris Metcalf to fix an implict include.." * 'systemh-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux: irq_work: fix compile failure on tile from missing include ia64: populate the cmpxchg header with appropriate code alpha: fix build failures from system.h dismemberment
Diffstat (limited to 'arch/alpha/include/asm/cmpxchg.h')
-rw-r--r--arch/alpha/include/asm/cmpxchg.h71
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/cmpxchg.h b/arch/alpha/include/asm/cmpxchg.h
new file mode 100644
index 000000000000..429e8cd0d78e
--- /dev/null
+++ b/arch/alpha/include/asm/cmpxchg.h
@@ -0,0 +1,71 @@
+#ifndef _ALPHA_CMPXCHG_H
+#define _ALPHA_CMPXCHG_H
+
+/*
+ * Atomic exchange routines.
+ */
+
+#define __ASM__MB
+#define ____xchg(type, args...) __xchg ## type ## _local(args)
+#define ____cmpxchg(type, args...) __cmpxchg ## type ## _local(args)
+#include <asm/xchg.h>
+
+#define xchg_local(ptr, x) \
+({ \
+ __typeof__(*(ptr)) _x_ = (x); \
+ (__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_, \
+ sizeof(*(ptr))); \
+})
+
+#define cmpxchg_local(ptr, o, n) \
+({ \
+ __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _n_ = (n); \
+ (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
+ (unsigned long)_n_, \
+ sizeof(*(ptr))); \
+})
+
+#define cmpxchg64_local(ptr, o, n) \
+({ \
+ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
+ cmpxchg_local((ptr), (o), (n)); \
+})
+
+#ifdef CONFIG_SMP
+#undef __ASM__MB
+#define __ASM__MB "\tmb\n"
+#endif
+#undef ____xchg
+#undef ____cmpxchg
+#define ____xchg(type, args...) __xchg ##type(args)
+#define ____cmpxchg(type, args...) __cmpxchg ##type(args)
+#include <asm/xchg.h>
+
+#define xchg(ptr, x) \
+({ \
+ __typeof__(*(ptr)) _x_ = (x); \
+ (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, \
+ sizeof(*(ptr))); \
+})
+
+#define cmpxchg(ptr, o, n) \
+({ \
+ __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _n_ = (n); \
+ (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
+ (unsigned long)_n_, sizeof(*(ptr)));\
+})
+
+#define cmpxchg64(ptr, o, n) \
+({ \
+ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
+ cmpxchg((ptr), (o), (n)); \
+})
+
+#undef __ASM__MB
+#undef ____cmpxchg
+
+#define __HAVE_ARCH_CMPXCHG 1
+
+#endif /* _ALPHA_CMPXCHG_H */