kernel.git/arch/s390/lib/spinlock.c, branch linux-3.1.y

[S390] spinlock: check virtual cpu running status

2010-02-26T21:37:31Z

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 Signed-off-by: Martin Schwidefsky

[S390] Move __cpu_logical_map to smp.c

2010-01-13T19:44:45Z

Finally move it to the place where it belongs to and make get rid of it for !CONFIG_SMP. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

locking: Convert raw_rwlock functions to arch_rwlock

2009-12-14T22:55:32Z

Name space cleanup for rwlock functions. No functional change. Signed-off-by: Thomas Gleixner Acked-by: Peter Zijlstra Acked-by: David S. Miller Acked-by: Ingo Molnar Cc: linux-arch@vger.kernel.org

locking: Convert raw_rwlock to arch_rwlock

2009-12-14T22:55:32Z

Not strictly necessary for -rt as -rt does not have non sleeping rwlocks, but it's odd to not have a consistent naming convention. No functional change. Signed-off-by: Thomas Gleixner Acked-by: Peter Zijlstra Acked-by: David S. Miller Acked-by: Ingo Molnar Cc: linux-arch@vger.kernel.org

locking: Convert __raw_spin* functions to arch_spin*

2009-12-14T22:55:32Z

Name space cleanup. No functional change. Signed-off-by: Thomas Gleixner Acked-by: Peter Zijlstra Acked-by: David S. Miller Acked-by: Ingo Molnar Cc: linux-arch@vger.kernel.org

locking: Convert raw_spinlock to arch_spinlock

2009-12-14T22:55:32Z

The raw_spin* namespace was taken by lockdep for the architecture specific implementations. raw_spin_* would be the ideal name space for the spinlocks which are not converted to sleeping locks in preempt-rt. Linus suggested to convert the raw_ to arch_ locks and cleanup the name space instead of using an artifical name like core_spin, atomic_spin or whatever No functional change. Signed-off-by: Thomas Gleixner Acked-by: Peter Zijlstra Acked-by: David S. Miller Acked-by: Ingo Molnar Cc: linux-arch@vger.kernel.org

[S390] implement interrupt-enabling rwlocks

2009-06-12T08:27:29Z

arch backend for f5f7eac41db827a47b2163330eecd7bb55ae9f12 "Allow rwlocks to re-enable interrupts". Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

[S390] do local_irq_restore while spinning in spin_lock_irqsave.

2008-01-26T13:11:31Z

In s390's spin_lock_irqsave, interrupts remain disabled while spinning. In other architectures like x86 and powerpc, interrupts are re-enabled while spinning if IRQ is not masked before spin_lock_irqsave is called. The following patch re-enables interrupts through local_irq_restore while spinning for a lock acquisition. This can improve system response. [heiko.carstens@de.ibm.com: removed saving of pc] Signed-off-by: Hisashi Hifumi Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

[S390] Remove owner_pc member from raw_spinlock_t.

2008-01-26T13:11:14Z

Used to contain the address of the holder of the lock. But since the spinlock code is not inlined anymore all locks contain the same address anyway. And since in addtition nobody complained about that for ages its obviously unused. So remove it. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

[PATCH] Directed yield: direct yield of spinlocks for s390.

2006-10-01T07:39:22Z

Use the new diagnose 0x9c in the spinlock implementation for s390. It yields the remaining timeslice of the virtual cpu that tries to acquire a lock to the virtual cpu that is the current holder of the lock. Signed-off-by: Martin Schwidefsky Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds