tree 12c7ec767a4a8508be33442c6fb55c28a26c94cd
parent 7798330ac8114c731cfab83e634c6ecedaa233d7
author Linus Torvalds <torvalds@linux-foundation.org> 1282348180 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1282405800 -0700

mm: make stack guard page logic use vm_prev pointer

Like the mlock() change previously, this makes the stack guard check
code use vma->vm_prev to see what the mapping below the current stack
is, rather than have to look it up with find_vma().

Also, accept an abutting stack segment, since that happens naturally if
you split the stack with mlock or mprotect.

Tested-by: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>