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s390: remove diag 44 calls from cpu_relax()

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Simplify cpu_relax() to a simple barrier(). Performance wise this doesn't
seem to make any big difference anymore, since nearly all lock variants
have directed yield semantics in the meantime.
Also this makes s390 behave like all other architectures.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2014-09-15 10:50:47 +02:00 • committed by Martin Schwidefsky
parent 6ebdf1c79d
commit 57f2ffe14f
1 changed files with 0 additions and 2 deletions
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arch/s390/include/asm/processor.h
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@ -217,8 +217,6 @@ static inline unsigned short stap(void)
*/
static inline void cpu_relax(void)
{
if (MACHINE_HAS_DIAG44)
asm volatile("diag 0,0,68");
barrier();
}