From: Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>
Date: Sat, 26 Jan 2008 13:11:28 +0000 (+0100)
Subject: [S390] do local_irq_restore while spinning in spin_lock_irqsave.
X-Git-Tag: v2.6.25-rc1~1228^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=894cdde26b538c77b9943bc72f0570abf6e58e37;p=pandora-kernel.git

[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>
---

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