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x86, cmpxchg: Use __compiletime_error() to make usage messages a bit nicer

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Use __compiletime_error() to produce a compile-time error rather than
link-time, where available.

Signed-off-by: Jeremy Fitzhardinge <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>
This commit is contained in:
Jeremy Fitzhardinge 2011-08-29 14:47:58 -07:00 • committed by H. Peter Anvin
commit 61e2cd0acc
1 changed files with 11 additions and 4 deletions
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15
arch/x86/include/asm/cmpxchg.h
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@ -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