[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>
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@ -433,7 +433,6 @@ sclp_sync_wait(void)
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get_clock() > timeout &&
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del_timer(&sclp_request_timer))
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sclp_request_timer.function(sclp_request_timer.data);
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barrier();
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cpu_relax();
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}
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local_irq_disable();
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@ -201,9 +201,8 @@ unsigned long get_wchan(struct task_struct *p);
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static inline void cpu_relax(void)
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{
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if (MACHINE_HAS_DIAG44)
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asm volatile("diag 0,0,68" : : : "memory");
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else
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barrier();
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asm volatile("diag 0,0,68");
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barrier();
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}
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/*
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