From: Miaohe Lin <linmiaohe@xxxxxxxxxx> Subject: mm/hwpoison-inject: support injecting hwpoison to free page memory_failure() can handle free buddy page. Support injecting hwpoison to free page by adding is_free_buddy_page check when hwpoison filter is disabled. [akpm@xxxxxxxxxxxxxxxxxxxx: export is_free_buddy_page() to modules] Link: https://lkml.kernel.org/r/20220218092052.3853-1-linmiaohe@xxxxxxxxxx Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx> Cc: Naoya Horiguchi <naoya.horiguchi@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/hwpoison-inject.c | 4 ++-- mm/page_alloc.c | 1 + 2 files changed, 3 insertions(+), 2 deletions(-) --- a/mm/hwpoison-inject.c~mm-hwpoison-inject-support-injecting-hwpoison-to-free-page +++ a/mm/hwpoison-inject.c @@ -32,9 +32,9 @@ static int hwpoison_inject(void *data, u shake_page(hpage); /* - * This implies unable to support non-LRU pages. + * This implies unable to support non-LRU pages except free page. */ - if (!PageLRU(hpage) && !PageHuge(p)) + if (!PageLRU(hpage) && !PageHuge(p) && !is_free_buddy_page(p)) return 0; /* --- a/mm/page_alloc.c~mm-hwpoison-inject-support-injecting-hwpoison-to-free-page +++ a/mm/page_alloc.c @@ -9417,6 +9417,7 @@ bool is_free_buddy_page(struct page *pag return order < MAX_ORDER; } +EXPORT_SYMBOL(is_free_buddy_page); #ifdef CONFIG_MEMORY_FAILURE /* _
