mm/page_poison.c: replace bool variable with static key (11c9c7ed) · Commits · 戴 / test

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:

Andrew 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:

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()));
		}