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SubjectRe: [ 39/40] cpuset: mm: reduce large amounts of memory barrier related damage v3
On Sat, Jul 28, 2012 at 02:02:31AM -0300, Herton Ronaldo Krzesinski wrote:
> > Thanks, I've merged this with the "original" in the tree, so all should
> > be good now.
>
> Thanks. I saw what seems another issue now on the patch too, sorry for
> not noticing earlier: this backport is lacking the
> write_seqcount_{begin,end} on set_mems_allowed for the case with
> CONFIG_CPUSETS, like in the original patch:
>

Not my finest moment :(

Thanks

---8<---
cpuset: mm: reduce large amounts of memory barrier related damage v3 fix

Missing hunk from backport.

Reported-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: Mel Gorman <mgorman@suse.de>

diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index 8f15695..7a7e5fd 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -113,7 +113,9 @@ static inline bool put_mems_allowed(unsigned int seq)
static inline void set_mems_allowed(nodemask_t nodemask)
{
task_lock(current);
+ write_seqcount_begin(&current->mems_allowed_seq);
current->mems_allowed = nodemask;
+ write_seqcount_end(&current->mems_allowed_seq);
task_unlock(current);
}


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