From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Thu, 15 May 2008 14:52:38 +0000 (+0200)
Subject: [S390] smp: __smp_call_function_map vs cpu_online_map fix.
X-Git-Tag: v2.6.26-rc3~31^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=85cb185dad54be308c3f3a6068dd7d418b8b53e4;p=pandora-kernel.git

[S390] smp: __smp_call_function_map vs cpu_online_map fix.

Both smp_call_function() and __smp_call_function_map() access
cpu_online_map. Both functions run with preemption disabled which
protects for cpus going offline. However new cpus can be added and
therefore the cpu_online_map can change unexpectedly.
So use the call_lock to protect against changes to the cpu_online_map
in start_secondary() and all smp_call_* functions.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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