Messages in this thread Patch in this message |  | | From | Wei Wang <> | Subject | [PATCH v32 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules | Date | Tue, 10 Apr 2018 09:50:08 +0800 |
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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> --- mm/page_poison.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/mm/page_poison.c b/mm/page_poison.c index e83fd44..762b472 100644 --- a/mm/page_poison.c +++ b/mm/page_poison.c @@ -17,6 +17,11 @@ static int 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) { -- 2.7.4
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