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authorMikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>2011-05-09 13:01:09 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-09 16:22:07 -0700
commita09a79f66874c905af35d5bb5e5f2fdc7b6b894d (patch)
tree9cb2ae1fef7083af91a49c19411e9871e0e59a37 /drivers/video
parent26822eebb25500fb0776c7c256a6af041e9f538b (diff)
Don't lock guardpage if the stack is growing up
Linux kernel excludes guard page when performing mlock on a VMA with down-growing stack. However, some architectures have up-growing stack and locking the guard page should be excluded in this case too. This patch fixes lvm2 on PA-RISC (and possibly other architectures with up-growing stack). lvm2 calculates number of used pages when locking and when unlocking and reports an internal error if the numbers mismatch. [ Patch changed fairly extensively to also fix /proc/<pid>/maps for the grows-up case, and to move things around a bit to clean it all up and share the infrstructure with the /proc bits. Tested on ia64 that has both grow-up and grow-down segments - Linus ] Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Tested-by: Tony Luck <tony.luck@gmail.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video')
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