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s390/rwlock: use directed yield for write-locked rwlocks
authorMartin Schwidefsky <schwidefsky@de.ibm.com>
Fri, 19 Sep 2014 12:29:31 +0000 (14:29 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Thu, 25 Sep 2014 08:52:05 +0000 (10:52 +0200)
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>

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