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kernel
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linux
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>
authored by
Jeremy Fitzhardinge
and committed by
H. Peter Anvin
61e2cd0a
229855d6
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-4
+11
-4
arch/x86/include/asm/cmpxchg.h
+11
-4
arch/x86/include/asm/cmpxchg.h
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#ifndef ASM_X86_CMPXCHG_H
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#define ASM_X86_CMPXCHG_H
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#include <linux/compiler.h>
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#include <asm/alternative.h> /* Provides LOCK_PREFIX */
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/* Non-existant functions to indicate usage errors at link time. */
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extern void __xchg_wrong_size(void);
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extern void __cmpxchg_wrong_size(void);
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extern void __xadd_wrong_size(void);
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/*
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* Non-existant functions to indicate usage errors at link time
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* (or compile-time if the compiler implements __compiletime_error().
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*/
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extern void __xchg_wrong_size(void)
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__compiletime_error("Bad argument size for xchg");
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extern void __cmpxchg_wrong_size(void)
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__compiletime_error("Bad argument size for cmpxchg");
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extern void __xadd_wrong_size(void)
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__compiletime_error("Bad argument size for xadd");
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/*
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* Constants for operation sizes. On 32-bit, the 64-bit size it set to