From: Naoya Horiguchi Date: Sat, 16 Jan 2016 00:57:46 +0000 (-0800) Subject: mm: soft-offline: exit with failure for non anonymous thp X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=98fd1ef4241ce0c700a174dd3e33c643b4774690;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git mm: soft-offline: exit with failure for non anonymous thp Currently memory_failure() doesn't handle non anonymous thp case, because we can hardly expect the error handling to be successful, and it can just hit some corner case which results in BUG_ON or something severe like that. This is also the case for soft offline code, so let's make it in the same way. Orignal code has a MF_COUNT_INCREASED check before put_hwpoison_page(), but it's unnecessary because get_any_page() is already called when running on this code, which takes a refcount of the target page regardress of the flag. So this patch also removes it. [akpm@linux-foundation.org: fix build] Signed-off-by: Naoya Horiguchi Cc: Andi Kleen Cc: "Kirill A. Shutemov" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 2015c9a06cae..ac595e7a3a95 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1691,16 +1691,16 @@ static int soft_offline_in_use_page(struct page *page, int flags) if (!PageHuge(page) && PageTransHuge(hpage)) { lock_page(hpage); - ret = split_huge_page(hpage); - unlock_page(hpage); - if (unlikely(ret || PageTransCompound(page) || - !PageAnon(page))) { - pr_info("soft offline: %#lx: failed to split THP\n", - page_to_pfn(page)); - if (flags & MF_COUNT_INCREASED) - put_hwpoison_page(hpage); + if (!PageAnon(hpage) || unlikely(split_huge_page(hpage))) { + unlock_page(hpage); + if (!PageAnon(hpage)) + pr_info("soft offline: %#lx: non anonymous thp\n", page_to_pfn(page)); + else + pr_info("soft offline: %#lx: thp split failed\n", page_to_pfn(page)); + put_hwpoison_page(hpage); return -EBUSY; } + unlock_page(hpage); get_hwpoison_page(page); put_hwpoison_page(hpage); }