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authorMikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>2011-05-09 13:01:09 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2011-05-21 15:13:07 -0700
commite277c750ea81076d8dc68694acc7994a024d83b2 (patch)
tree5bb1a87f3c6f05d348a823be4d1685431bf09bcb /drivers/gpu/drm
parent3dead919f4cf95df59d8df06c1fa559c55571384 (diff)
Don't lock guardpage if the stack is growing up
commit a09a79f66874c905af35d5bb5e5f2fdc7b6b894d upstream. 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> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/gpu/drm')
0 files changed, 0 insertions, 0 deletions