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| author |   Tejun Heo <tj@kernel.org> | 2018-04-10 16:29:09 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-11 10:28:31 -0700 |
| commit | 18be460eeb2cd3f4bfb6498b10ce5b800f9a20ea (patch) | |
| tree | 2e1462c470d5f7edb26dfb6cae4e8d10a34cfeb9 /mm/hwpoison-inject.c | |
| parent | mm/hmm: use device driver encoding for HMM pfn (diff) | |
| download | wireguard-linux-18be460eeb2cd3f4bfb6498b10ce5b800f9a20ea.tar.xz wireguard-linux-18be460eeb2cd3f4bfb6498b10ce5b800f9a20ea.zip | |
mm/hmm.c: remove superfluous RCU protection around radix tree lookup
hmm_devmem_find() requires rcu_read_lock_held() but there's nothing which
actually uses the RCU protection. The only caller is
hmm_devmem_pages_create() which already grabs the mutex and does
superfluous rcu_read_lock/unlock() around the function.
This doesn't add anything and just adds to confusion. Remove the RCU
protection and open-code the radix tree lookup. If this needs to become
more sophisticated in the future, let's add them back when necessary.
Link: http://lkml.kernel.org/r/20180314194515.1661824-4-tj@kernel.org
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jérôme Glisse <jglisse@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Kent Overstreet <kent.overstreet@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hwpoison-inject.c')
0 files changed, 0 insertions, 0 deletions