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Commit 61e2cd0a authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by H. Peter Anvin
Browse files

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: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Link: http://lkml.kernel.org/r/4E5BCC40.3030501@goop.org


Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 229855d6

arch/x86/include/asm/cmpxchg.h

+11 −4
Original line number Diff line number Diff line 
#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