tree a3415cd897823975b927f89a233d2703bf97ba2b
parent 610a77e04a8d9fe8764dc484e2182fa251ce1cc2
author Akinobu Mita <akinobu.mita@gmail.com> 1238538197 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1238601553 -0700

generic debug pagealloc

CONFIG_DEBUG_PAGEALLOC is now supported by x86, powerpc, sparc64, and
s390.  This patch implements it for the rest of the architectures by
filling the pages with poison byte patterns after free_pages() and
verifying the poison patterns before alloc_pages().

This generic one cannot detect invalid page accesses immediately but
invalid read access may cause invalid dereference by poisoned memory and
invalid write access can be detected after a long delay.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>