On Tue, May 27, 2014 at 3:43 AM, Maurizio Lombardi <mlomb...@redhat.com> wrote: > Hi Jens, > > looks like that commit 3979ef4dcf3d1de55a560a3a4016c30a835df44d > ("bio-modify-__bio_add_page-to-accept-pages-that-dont-start-a-new-segment-v3") > introduces a regression, as reported by Jet Chan. > > Do you have any idea about the possible problem with this patch? > > it is the one that performs a recount of the segments in case of failure in > __bio_add_page() > > http://www.spinics.net/lists/mm-commits/msg103684.html > > I would not be surprised if the bug was introduced by fceb38f36f, because it > contained a mystake that commit 3979ef4dcf supposedly fixed. > But learning that commit 3979ef4dcf is introducing a regression leaves > me quite puzzled.
>From code of __blk_recalc_rq_segments(), looks it won't check if recounted physical segment number is bigger than queue_max_segments(), so wondering if blk_recount_segments() can always decrease physical segment number. Thanks, -- Ming Lei -- 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/