From 91fbdc0f89807bb97792ea6893717a8d3154b871 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Wed, 11 Feb 2015 15:25:04 -0800 Subject: [PATCH] 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 Cc: Mel Gorman Cc: Johannes Weiner Reviewed-by: Yasuaki Ishimatsu Cc: David Rientjes Acked-by: Vlastimil Babka Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_alloc.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index f121050e8530..1c7d90f7a84a 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2865,6 +2865,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, unsigned int cpuset_mems_cookie; int alloc_flags = ALLOC_WMARK_LOW|ALLOC_CPUSET|ALLOC_FAIR; int classzone_idx; + gfp_t alloc_mask; /* The gfp_t that was actually used for allocation */ gfp_mask &= gfp_allowed_mask; @@ -2898,22 +2899,24 @@ retry_cpuset: classzone_idx = zonelist_zone_idx(preferred_zoneref); /* First allocation attempt */ - page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order, - zonelist, high_zoneidx, alloc_flags, - preferred_zone, classzone_idx, migratetype); + alloc_mask = gfp_mask|__GFP_HARDWALL; + page = get_page_from_freelist(alloc_mask, nodemask, order, zonelist, + high_zoneidx, alloc_flags, preferred_zone, + classzone_idx, migratetype); if (unlikely(!page)) { /* * Runtime PM, block IO and its error handling path * can deadlock because I/O on the device might not * complete. */ - gfp_mask = memalloc_noio_flags(gfp_mask); - page = __alloc_pages_slowpath(gfp_mask, order, + alloc_mask = memalloc_noio_flags(gfp_mask); + + page = __alloc_pages_slowpath(alloc_mask, order, zonelist, high_zoneidx, nodemask, preferred_zone, classzone_idx, migratetype); } - trace_mm_page_alloc(page, order, gfp_mask, migratetype); + trace_mm_page_alloc(page, order, alloc_mask, migratetype); out: /* -- 2.20.1