tree 7794f24be80ffaad203616bf71162bc6b54c133f
parent 8e3f8755545cc4a7f4da8e9ef76d6d32e0dca576
author Roger Pau Monne <roger.pau@citrix.com> 1371812213 +0200
committer Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1371844724 -0400

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>