From: Roger Pau Monne <roger.pau@citrix.com>
Date: Fri, 21 Jun 2013 10:56:53 +0000 (+0200)
Subject: xen-blkback: workaround compiler bug in gcc 4.1
X-Git-Tag: v3.11-rc3~32^2~9^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2d9105433ff471d2c688817e98804029c074a623;p=pandora-kernel.git

xen-blkback: workaround compiler bug in gcc 4.1

The code generat with gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-54)
creates an unbound loop for the second foreach_grant_safe loop in
purge_persistent_gnt.

The workaround is to avoid having this second loop and instead
perform all the work inside the first loop by adding a new variable,
clean_used, that will be set when all the desired persistent grants
have been removed and we need to iterate over the remaining ones to
remove the WAS_ACTIVE flag.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reported-by: Tom O'Neill <toneill@vmem.com>
Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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