Commit d95f58f4 authored Aug 27, 2018 by Wei Wang Committed by Michael S. Tsirkin Oct 24, 2018

mm/page_poison: expose page_poisoning_enabled to kernel modules

In some usages, e.g. virtio-balloon, a kernel module needs to know if
page poisoning is in use. This patch exposes the page_poisoning_enabled
function to kernel modules.

Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

parent 86a55978

mm/page_poison.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -17,6 +17,11 @@ static int __init early_page_poison_param(char *buf)
		}
		early_param("page_poison", early_page_poison_param);

		/**
		* page_poisoning_enabled - check if page poisoning is enabled
		*
		* Return true if page poisoning is enabled, or false if not.
		*/
		bool page_poisoning_enabled(void)
		{
		/*
		@@ -29,6 +34,7 @@ bool page_poisoning_enabled(void)
		(!IS_ENABLED(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) &&
		debug_pagealloc_enabled()));
		}
		EXPORT_SYMBOL_GPL(page_poisoning_enabled);

		static void poison_page(struct page *page)
		{

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