[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>

diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
index 027cdc1..c1dd19b 100644 (file)
--- a/drivers/s390/char/sclp.c
+++ b/drivers/s390/char/sclp.c
@@ -433,7 +433,6 @@ sclp_sync_wait(void)
                    get_clock() > timeout &&
                    del_timer(&sclp_request_timer))
                        sclp_request_timer.function(sclp_request_timer.data);
-               barrier();
                cpu_relax();
        }
        local_irq_disable();

diff --git a/include/asm-s390/processor.h b/include/asm-s390/processor.h
index cbbedc6..5dc6b93 100644 (file)
--- a/include/asm-s390/processor.h
+++ b/include/asm-s390/processor.h
@@ -201,9 +201,8 @@ unsigned long get_wchan(struct task_struct *p);
 static inline void cpu_relax(void)
 {
        if (MACHINE_HAS_DIAG44)
-               asm volatile("diag 0,0,68" : : : "memory");
-       else
-               barrier();
+               asm volatile("diag 0,0,68");
+       barrier();
 }
 
 /*