On Monday, March 26, 2018 10:40 AM, Wang, Wei W wrote:
> Subject: [PATCH v29 3/4] 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@xxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxxxxx>
> Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
> ---
> 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
Could we get a review of this patch? We've reviewed other parts, and this one seems to be the last part of this feature. Thanks.
Best,
Wei
