s390/cmpxchg: use compiler builtins

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The kernel build for s390 fails for gcc compilers with version 3.x,
set the minimum required version of gcc to version 4.3.

As the atomic builtins are available with all gcc 4.x compilers,
use the __sync_val_compare_and_swap and __sync_bool_compare_and_swap
functions to replace the complex macro and inline assembler magic
in include/asm/cmpxchg.h. The compiler can just-do-it and generates
better code with the builtins.

While we are at it use __sync_bool_compare_and_swap for the
_raw_compare_and_swap function in the spinlock code as well.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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This commit is contained in:

Martin Schwidefsky 2014-10-29 12:50:31 +01:00

parent fcbe08d66f

commit f318a1229b

3 changed files with 19 additions and 234 deletions

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244

arch/s390/include/asm/cmpxchg.h

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9

arch/s390/include/asm/spinlock.h

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4

arch/s390/kernel/asm-offsets.c

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