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| author | Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp> | 2008-01-26 14:11:28 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-01-26 14:11:31 +0100 |
| commit | 894cdde26b538c77b9943bc72f0570abf6e58e37 (patch) | |
| tree | 335f75460bd947c4969c9b7a1ec5764b98bf1d2b /include/asm-s390/sclp.h | |
| parent | [S390] add smp_call_function_mask (diff) | |
| download | linux-894cdde26b538c77b9943bc72f0570abf6e58e37.tar.xz linux-894cdde26b538c77b9943bc72f0570abf6e58e37.zip | |
[S390] do local_irq_restore while spinning in spin_lock_irqsave.
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 <hifumi.hisashi@oss.ntt.co.jp>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'include/asm-s390/sclp.h')
0 files changed, 0 insertions, 0 deletions