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author | Nick Piggin <npiggin@suse.de> | 2008-09-10 13:37:17 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-09-10 13:48:49 +0200 |
commit | c10d38dda1774ed4540380333cabd229eff37094 (patch) | |
tree | be9649dab7c0017c0a700f146db70f730ad819a7 /mm/memory.c | |
parent | 76b189e91845eab3a9d52bb97f971d312d25652d (diff) | |
download | op-kernel-dev-c10d38dda1774ed4540380333cabd229eff37094.zip op-kernel-dev-c10d38dda1774ed4540380333cabd229eff37094.tar.gz |
x86: some lock annotations for user copy paths
copy_to/from_user and all its variants (except the atomic ones) can take a
page fault and perform non-trivial work like taking mmap_sem and entering
the filesyste/pagecache.
Unfortunately, this often escapes lockdep because a common pattern is to
use it to read in some arguments just set up from userspace, or write data
back to a hot buffer. In those cases, it will be unlikely for page reclaim
to get a window in to cause copy_*_user to fault.
With the new might_lock primitives, add some annotations to x86. I don't
know if I caught all possible faulting points (it's a bit of a maze, and I
didn't really look at 32-bit). But this is a starting point.
Boots and runs OK so far.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'mm/memory.c')
0 files changed, 0 insertions, 0 deletions