From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Wed, 21 Feb 2007 09:55:15 +0000 (+0100)
Subject: [S390] etr: Add barrier() to etr_sync_cpu_start().
X-Git-Tag: v2.6.21-rc2~75
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c732de2d3673e28c6a976c98ee6ba4d197a919a;p=pandora-kernel.git

[S390] etr: Add barrier() to etr_sync_cpu_start().

Force reading of *in_sync in while loop. Loops where the content that
is checked for is changed by a different cpu always should have some
sort of barrier() semantics.
Otherwise this might lead to very subtle bugs.

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