linux/arch/arm/include/asm/compiler.h

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#ifndef __ASM_ARM_COMPILER_H
#define __ASM_ARM_COMPILER_H
/*
* This is used to ensure the compiler did actually allocate the register we
* asked it for some inline assembly sequences. Apparently we can't trust
* the compiler from one version to another so a bit of paranoia won't hurt.
* This string is meant to be concatenated with the inline asm string and
* will cause compilation to stop on mismatch.
* (for details, see gcc PR 15089)
*/
#define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
#endif /* __ASM_ARM_COMPILER_H */