On Mon, Jun 30, 2014 at 05:32:16PM -0700, Andi Kleen wrote: > From: Andi Kleen <a...@linux.intel.com> > > When a hwpoison page is locked it could change state > due to parallel modifications. Check after the lock > if the page is still the same compound page. > > [v2: Removed earlier non LRU check which should be already > covered elsewhere] > > Cc: Naoya Horiguchi <n-horigu...@ah.jp.nec.com> > Signed-off-by: Andi Kleen <a...@linux.intel.com>
Acked-by: Naoya Horiguchi <n-horigu...@ah.jp.nec.com> Is it -stable matter? Maybe 2.6.38+ can profit from this. Thanks, Naoya Horiguchi > --- > mm/memory-failure.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/mm/memory-failure.c b/mm/memory-failure.c > index cd8989c..99e5077 100644 > --- a/mm/memory-failure.c > +++ b/mm/memory-failure.c > @@ -1168,6 +1168,16 @@ int memory_failure(unsigned long pfn, int trapno, int > flags) > lock_page(hpage); > > /* > + * The page could have changed compound pages during the locking. > + * If this happens just bail out. > + */ > + if (compound_head(p) != hpage) { > + action_result(pfn, "different compound page after locking", > IGNORED); > + res = -EBUSY; > + goto out; > + } > + > + /* > * We use page flags to determine what action should be taken, but > * the flags can be modified by the error containment action. One > * example is an mlocked page, where PG_mlocked is cleared by > -- > 1.9.3 > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majord...@kvack.org. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"d...@kvack.org"> em...@kvack.org </a> > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/