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UPSTREAM: mm/page_poison: expose page_poisoning_enabled to kernel modules

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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>
Change-Id: Icab2f64ef17850ac8b636bd302653bb5f1960e8c
(cherry picked from d95f58f4a6ca002126c36c530fb096519c94baef)
Signed-off-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Todd Kjos <tkjos@google.com>
This commit is contained in:
Wei Wang
2018-08-27 09:32:18 +08:00
committed by Todd Kjos
parent 22005d0c77
commit e728d92e61
1 changed files with 6 additions and 0 deletions
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6
mm/page_poison.c
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@ -18,6 +18,11 @@ static int __init early_page_poison_param(char *buf)
} }
early_param("page_poison", early_page_poison_param); 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) bool page_poisoning_enabled(void)
{ {
/* /*
@ -30,6 +35,7 @@ bool page_poisoning_enabled(void)
(!IS_ENABLED(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) && (!IS_ENABLED(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) &&
debug_pagealloc_enabled())); debug_pagealloc_enabled()));
} }
EXPORT_SYMBOL_GPL(page_poisoning_enabled);
static void poison_page(struct page *page) static void poison_page(struct page *page)
{ {