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>hifive-unleashed-5.1
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@ -17,6 +17,11 @@ static int __init early_page_poison_param(char *buf)
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}
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}
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early_param("page_poison", early_page_poison_param);
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early_param("page_poison", early_page_poison_param);
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/**
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* page_poisoning_enabled - check if page poisoning is enabled
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*
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* Return true if page poisoning is enabled, or false if not.
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*/
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bool page_poisoning_enabled(void)
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bool page_poisoning_enabled(void)
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{
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{
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/*
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/*
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@ -29,6 +34,7 @@ bool page_poisoning_enabled(void)
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(!IS_ENABLED(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) &&
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(!IS_ENABLED(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) &&
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debug_pagealloc_enabled()));
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debug_pagealloc_enabled()));
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}
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}
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EXPORT_SYMBOL_GPL(page_poisoning_enabled);
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static void poison_page(struct page *page)
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static void poison_page(struct page *page)
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{
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{
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