tree c134f1772c46e2c5214550aaf08c58b36d755a55
parent 69bc70d4f97ce82153bed0afc9f432700c60390b
author Michel Lespinasse <walken@google.com> 1296522221 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1296602450 +1100

mlock: operate on any regions with protection != PROT_NONE

As Tao Ma noticed, change 5ecfda0 breaks blktrace. This is because
blktrace mmaps a file with PROT_WRITE permissions but without PROT_READ,
so my attempt to not unnecessarity break COW during mlock ended up
causing mlock to fail with a permission problem.

I am proposing to let mlock ignore vma protection in all cases except
PROT_NONE. In particular, mlock should not fail for PROT_WRITE regions
(as in the blktrace case, which broke at 5ecfda0) or for PROT_EXEC
regions (which seem to me like they were always broken).

Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>