mm/page_alloc.c:__alloc_pages_nodemask(): don't alter arg gfp_mask
__alloc_pages_nodemask() strips __GFP_IO when retrying the page allocation. But it does this by altering the function-wide variable gfp_mask. This will cause subsequent allocation attempts to inadvertently use the modified gfp_mask. Also, pass the correct mask (the mask we actually used) into trace_mm_page_alloc(). Cc: Ming Lei <ming.lei@canonical.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -2865,6 +2865,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
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unsigned int cpuset_mems_cookie;
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int alloc_flags = ALLOC_WMARK_LOW|ALLOC_CPUSET|ALLOC_FAIR;
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int classzone_idx;
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gfp_t alloc_mask; /* The gfp_t that was actually used for allocation */
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gfp_mask &= gfp_allowed_mask;
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@ -2898,22 +2899,24 @@ retry_cpuset:
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classzone_idx = zonelist_zone_idx(preferred_zoneref);
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/* First allocation attempt */
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page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order,
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zonelist, high_zoneidx, alloc_flags,
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preferred_zone, classzone_idx, migratetype);
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alloc_mask = gfp_mask|__GFP_HARDWALL;
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page = get_page_from_freelist(alloc_mask, nodemask, order, zonelist,
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high_zoneidx, alloc_flags, preferred_zone,
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classzone_idx, migratetype);
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if (unlikely(!page)) {
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/*
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* Runtime PM, block IO and its error handling path
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* can deadlock because I/O on the device might not
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* complete.
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*/
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gfp_mask = memalloc_noio_flags(gfp_mask);
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page = __alloc_pages_slowpath(gfp_mask, order,
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alloc_mask = memalloc_noio_flags(gfp_mask);
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page = __alloc_pages_slowpath(alloc_mask, order,
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zonelist, high_zoneidx, nodemask,
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preferred_zone, classzone_idx, migratetype);
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}
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trace_mm_page_alloc(page, order, gfp_mask, migratetype);
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trace_mm_page_alloc(page, order, alloc_mask, migratetype);
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out:
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/*
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