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s390/rwlock: use directed yield for write-locked rwlocks

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Add an owner field to the arch_rwlock_t to be able to pass the timeslice
of a virtual CPU with diagnose 0x9c to the lock owner in case the rwlock
is write-locked. The undirected yield in case the rwlock is acquired
writable but the lock is read-locked is removed.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2014-09-19 14:29:31 +02:00
parent 46b05c7bd5
commit d59b93da5e
5 changed files with 54 additions and 32 deletions
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6
arch/s390/kernel/smp.c
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@@ -333,12 +333,6 @@ int smp_vcpu_scheduled(int cpu)
return pcpu_running(pcpu_devices + cpu);
}
void smp_yield(void)
{
if (MACHINE_HAS_DIAG44)
asm volatile("diag 0,0,0x44");
}
void smp_yield_cpu(int cpu)
{
if (MACHINE_HAS_DIAG9C)