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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2010-02-26 21:37:40 (GMT)
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-02-26 21:37:31 (GMT)
commit59b697874529f5c3cbcaf5816b3d6c584af521e8 (patch)
treec395952c2a0bb9a3027a37a30dd37cc93b1a7c3f /arch/s390/hypfs
parent8387c736fcbaec17890b8d075ee4f4623518b54a (diff)
downloadlinux-fsl-qoriq-59b697874529f5c3cbcaf5816b3d6c584af521e8.tar.xz
[S390] spinlock: check virtual cpu running status
This patch introduces a new function that checks the running status of a cpu in a hypervisor. This status is not virtualized, so the check is only correct if running in an LPAR. On acquiring a spinlock, if the cpu holding the lock is scheduled by the hypervisor, we do a busy wait on the lock. If it is not scheduled, we yield over to that cpu. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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