Commit 11c9c7ed authored by Mateusz Nosek's avatar Mateusz Nosek Committed by Linus Torvalds
Browse files

mm/page_poison.c: replace bool variable with static key 



Variable 'want_page_poisoning' is a switch deciding if page poisoning
should be enabled.  This patch changes it to be static key.

Signed-off-by: default avatarMateusz Nosek <mateusznosek0@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Oscar Salvador <OSalvador@suse.com>
Link: https://lkml.kernel.org/r/20200921152931.938-1-mateusznosek0@gmail.com


Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b94e0282

mm/page_poison.c

+15 −5
Original line number Diff line number Diff line
@@ -8,13 +8,23 @@ 
#include <linux/ratelimit.h>

#include <linux/kasan.h>



static bool want_page_poisoning __read_mostly;

static DEFINE_STATIC_KEY_FALSE_RO(want_page_poisoning);



static int __init early_page_poison_param(char *buf)

{

	if (!buf)

		return -EINVAL;

	return strtobool(buf, &want_page_poisoning);

	int ret;

	bool tmp;



	ret = strtobool(buf, &tmp);

	if (ret)

		return ret;



	if (tmp)

		static_branch_enable(&want_page_poisoning);

	else

		static_branch_disable(&want_page_poisoning);



	return 0;

}

early_param("page_poison", early_page_poison_param);
@@ -31,7 +41,7 @@ bool page_poisoning_enabled(void) 
	 * Page poisoning is debug page alloc for some arches. If

	 * either of those options are enabled, enable poisoning.

	 */

	return (want_page_poisoning ||

	return (static_branch_unlikely(&want_page_poisoning) ||

		(!IS_ENABLED(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) &&

		debug_pagealloc_enabled()));

}