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[S390] Small barrier() and cpu_relax() cleanup. 

cpu_relax() has barrier() semantics hence there is no need to use both
of them in conjunction in sclp_sync_wait(). Also change cpu_relax()
so it's more obvious that it has barrier semantics.

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 2007-02-05 21:17:20 +01:00 committed by Martin Schwidefsky
parent 1125b4640f
commit c48e09131b
2 changed files with 2 additions and 4 deletions
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1
drivers/s390/char/sclp.c
View File

@ -433,7 +433,6 @@ sclp_sync_wait(void)
get_clock() > timeout && get_clock() > timeout &&
del_timer(&sclp_request_timer)) del_timer(&sclp_request_timer))
sclp_request_timer.function(sclp_request_timer.data); sclp_request_timer.function(sclp_request_timer.data);
barrier();
cpu_relax(); cpu_relax();
} }
local_irq_disable(); local_irq_disable();

3
include/asm-s390/processor.h
View File

@ -201,8 +201,7 @@ unsigned long get_wchan(struct task_struct *p);
static inline void cpu_relax(void) static inline void cpu_relax(void)
{ {
if (MACHINE_HAS_DIAG44) if (MACHINE_HAS_DIAG44)
asm volatile("diag 0,0,68" : : : "memory"); asm volatile("diag 0,0,68");
else
barrier(); barrier();
} }