On 23 May 2014 07:49, Kevin Hilman <khil...@linaro.org> wrote: > On Fri, May 16, 2014 at 2:47 AM, Vlastimil Babka <vba...@suse.cz> wrote: >> Compaction uses compact_checklock_irqsave() function to periodically check >> for >> lock contention and need_resched() to either abort async compaction, or to >> free the lock, schedule and retake the lock. When aborting, cc->contended is >> set to signal the contended state to the caller. Two problems have been >> identified in this mechanism. > > This patch (or later version) has hit next-20140522 (in the form > commit 645ceea9331bfd851bc21eea456dda27862a10f4) and according to my > bisect, appears to be the culprit of several boot failures on ARM > platforms.
On i.MX6 where CMA is enabled, the commit causes the drivers calling dma_alloc_coherent() fail to probe. Tracing it a little bit, it seems dma_alloc_from_contiguous() always return page as NULL after this commit. Shawn -- 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/
