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Commit 704687de authored by Michal Hocko's avatar Michal Hocko Committed by Linus Torvalds
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mm: make slab and vmalloc allocators __GFP_NOLOCKDEP aware



sl?b and vmalloc allocators reduce the given gfp mask for their internal
needs.  For that they use GFP_RECLAIM_MASK to preserve the reclaim
behavior and constrains.

__GFP_NOLOCKDEP is not a part of that mask because it doesn't really
control the reclaim behavior strictly speaking.  On the other hand it
tells the underlying page allocator to disable reclaim recursion
detection so arguably it should be part of the mask.

Having __GFP_NOLOCKDEP in the mask will not alter the behavior in any
form so this change is safe pretty much by definition.  It also adds a
support for this flag to SL?B and vmalloc allocators which will in turn
allow its use to kvmalloc as well.  A lack of the support has been
noticed recently in

  http://lkml.kernel.org/r/20211119225435.GZ449541@dread.disaster.area

Link: https://lkml.kernel.org/r/YZ9XtLY4AEjVuiEI@dhcp22.suse.cz
Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
Reported-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: default avatarDave Chinner <dchinner@redhat.com>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Neil Brown <neilb@suse.de>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a421ef30
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