From: Hugh Dickins <hugh@veritas.com>
Date: Fri, 10 Nov 2006 21:32:40 +0000 (+0000)
Subject: [POWERPC] Make soft_enabled irqs preempt safe
X-Git-Tag: v2.6.20-rc2~6^2~13^2~13^2~107
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ef2b343e99e772e35f0f9d00f7db318b6629c16e;p=pandora-kernel.git

[POWERPC] Make soft_enabled irqs preempt safe

Rewrite local_get_flags and local_irq_disable to use r13 explicitly,
to avoid the risk that gcc will split get_paca()->soft_enabled into a
sequence unsafe against preemption.  Similar care in local_irq_restore.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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