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| author | Wei Wang <wei.w.wang@intel.com> | 2018-08-27 09:32:18 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2018-10-24 20:57:55 -0400 |
| commit | d95f58f4a6ca002126c36c530fb096519c94baef (patch) | |
| tree | 82797476fab40bafabc27af059f3ec42f9aae52d /mm/page_poison.c | |
| parent | 86a559787e6f5cf662c081363f64a20cad654195 (diff) | |
| download | lwn-d95f58f4a6ca002126c36c530fb096519c94baef.tar.gz lwn-d95f58f4a6ca002126c36c530fb096519c94baef.zip | |
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>
Diffstat (limited to 'mm/page_poison.c')
| -rw-r--r-- | mm/page_poison.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/page_poison.c b/mm/page_poison.c index aa2b3d34e8ea..830f60489b14 100644 --- a/mm/page_poison.c +++ b/mm/page_poison.c @@ -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) { |