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    Subject[PATCH v35 4/5] mm/page_poison: expose page_poisoning_enabled to kernel modules
    Date
    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 aa2b3d3..830f604 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)
    {
    --
    2.7.4
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