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authorNick Piggin <npiggin@suse.de>2008-09-10 13:37:17 +0200
committerIngo Molnar <mingo@elte.hu>2008-09-10 13:48:49 +0200
commitc10d38dda1774ed4540380333cabd229eff37094 (patch)
treebe9649dab7c0017c0a700f146db70f730ad819a7 /include/asm-x86/calling.h
parent76b189e91845eab3a9d52bb97f971d312d25652d (diff)
downloadblackbird-op-linux-c10d38dda1774ed4540380333cabd229eff37094.tar.gz
blackbird-op-linux-c10d38dda1774ed4540380333cabd229eff37094.zip
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 'include/asm-x86/calling.h')
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