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| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2011-08-29 23:47:58 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2011-08-30 02:20:40 +0200 |
| commit | 61e2cd0acc248c14793cefd7e23e209be9e0b70d (patch) | |
| tree | 218ddcf86ea6e7f2951c32e88e73ccdf753f9a2a /arch/x86/include/asm/cmpxchg.h | |
| parent | x86, ticketlock: Make __ticket_spin_trylock common (diff) | |
| download | linux-61e2cd0acc248c14793cefd7e23e209be9e0b70d.tar.xz linux-61e2cd0acc248c14793cefd7e23e209be9e0b70d.zip | |
x86, cmpxchg: Use __compiletime_error() to make usage messages a bit nicer
Use __compiletime_error() to produce a compile-time error rather than
link-time, where available.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Link: http://lkml.kernel.org/r/4E5BCC40.3030501@goop.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include/asm/cmpxchg.h')
| -rw-r--r-- | arch/x86/include/asm/cmpxchg.h | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/arch/x86/include/asm/cmpxchg.h b/arch/x86/include/asm/cmpxchg.h index 0d0d9cdd3309..5d3acdf5a7a6 100644 --- a/arch/x86/include/asm/cmpxchg.h +++ b/arch/x86/include/asm/cmpxchg.h @@ -1,12 +1,19 @@ #ifndef ASM_X86_CMPXCHG_H #define ASM_X86_CMPXCHG_H +#include <linux/compiler.h> #include <asm/alternative.h> /* Provides LOCK_PREFIX */ -/* Non-existant functions to indicate usage errors at link time. */ -extern void __xchg_wrong_size(void); -extern void __cmpxchg_wrong_size(void); -extern void __xadd_wrong_size(void); +/* + * Non-existant functions to indicate usage errors at link time + * (or compile-time if the compiler implements __compiletime_error(). + */ +extern void __xchg_wrong_size(void) + __compiletime_error("Bad argument size for xchg"); +extern void __cmpxchg_wrong_size(void) + __compiletime_error("Bad argument size for cmpxchg"); +extern void __xadd_wrong_size(void) + __compiletime_error("Bad argument size for xadd"); /* * Constants for operation sizes. On 32-bit, the 64-bit size it set to |