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mm: allow page poisoning to be enabled by default

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Add a config option to enable page poisoning by
default. The kernel command line option "page_poison"
can be used to change the behaviour during boot.

Change-Id: Ie70763841191a722b1c6125dfad119a29ed0f605
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>
[swatsrid@codeaurora.org: Fix merge errors and warnings]
Signed-off-by: Swathi Sridhar <swatsrid@codeaurora.org>
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Vinayak Menon 2017-04-05 10:49:14 +05:30 • committed by Isaac J. Manjarres
commit e6823c3dcc
2 changed files with 12 additions and 1 deletions
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10
mm/Kconfig.debug
View file

@ -85,6 +85,16 @@ config PAGE_POISONING
If unsure, say N
config PAGE_POISONING_ENABLE_DEFAULT
bool "Enable page poisoning by default?"
default n
depends on PAGE_POISONING
help
Enable page poisoning of free pages by default? This value
can be overridden by page_poison=off|on. This can be used
to avoid passing the kernel parameter and let page poisoning
feature enabled by default.
config PAGE_POISONING_NO_SANITY
depends on PAGE_POISONING
bool "Only poison, don't sanity check"

3
mm/page_poison.c
View file

@ -8,7 +8,8 @@
#include <linux/ratelimit.h>
#include <linux/kasan.h>
static bool want_page_poisoning __read_mostly;
static bool want_page_poisoning __read_mostly
= IS_ENABLED(CONFIG_PAGE_POISONING_ENABLE_DEFAULT);
static int __init early_page_poison_param(char *buf)
{