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authorJann Horn <[email protected]>2020-10-17 16:14:12 -0700
committerLinus Torvalds <[email protected]>2020-10-18 09:27:09 -0700
commitf3964599c22f70c37544c06b6b232c42746b940b (patch)
treef8e72270129ffb4247cddf38f58d0eba81435a46 /tools/perf/scripts/python
parentfb8090b699c3e147e5bef8e0008edc3bddc33fad (diff)
mm/gup_benchmark: take the mmap lock around GUP
To be safe against concurrent changes to the VMA tree, we must take the mmap lock around GUP operations (excluding the GUP-fast family of operations, which will take the mmap lock by themselves if necessary). This code is only for testing, and it's only reachable by root through debugfs, so this doesn't really have any impact; however, if we want to add lockdep asserts into the GUP path, we need to have clean locking here. Signed-off-by: Jann Horn <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Reviewed-by: Jason Gunthorpe <[email protected]> Reviewed-by: John Hubbard <[email protected]> Acked-by: Michel Lespinasse <[email protected]> Cc: "Eric W . Biederman" <[email protected]> Cc: Mauro Carvalho Chehab <[email protected]> Cc: Sakari Ailus <[email protected]> Link: https://lkml.kernel.org/r/CAG48ez3SG6ngZLtasxJ6LABpOnqCz5-QHqb0B4k44TQ8F9n6+w@mail.gmail.com Signed-off-by: Linus Torvalds <[email protected]>
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