mm, sparse, page_ext: drop ugly N_HIGH_MEMORY branches for allocations
authorMichal Hocko <mhocko@suse.com>
Wed, 6 Sep 2017 23:20:41 +0000 (16:20 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 7 Sep 2017 00:27:26 +0000 (17:27 -0700)
commitb95046b0472f7a805fa28fbcfc7205a76ff7a7d0
treeb024100d9cc8525f8dc80cddbc908cb08f5ab17c
parentb93e0f329e24f3615aa551fd9b99a75fb7c9195f
mm, sparse, page_ext: drop ugly N_HIGH_MEMORY branches for allocations

Commit f52407ce2dea ("memory hotplug: alloc page from other node in
memory online") has introduced N_HIGH_MEMORY checks to only use NUMA
aware allocations when there is some memory present because the
respective node might not have any memory yet at the time and so it
could fail or even OOM.

Things have changed since then though.  Zonelists are now always
initialized before we do any allocations even for hotplug (see
959ecc48fc75 ("mm/memory_hotplug.c: fix building of node hotplug
zonelist")).

Therefore these checks are not really needed.  In fact caller of the
allocator should never care about whether the node is populated because
that might change at any time.

Link: http://lkml.kernel.org/r/20170721143915.14161-10-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Shaohua Li <shaohua.li@intel.com>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/page_ext.c
mm/sparse-vmemmap.c
mm/sparse.c