From patchwork Mon May 16 19:37:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 573249 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98AF1C4332F for ; Mon, 16 May 2022 20:13:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345915AbiEPULR (ORCPT ); Mon, 16 May 2022 16:11:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57562 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351134AbiEPUCD (ORCPT ); Mon, 16 May 2022 16:02:03 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D143729C; Mon, 16 May 2022 12:59:28 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 53B8960A50; Mon, 16 May 2022 19:59:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5D40FC385AA; Mon, 16 May 2022 19:59:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652731167; bh=CNi+yjjTcCMqIQK+Bgv9r5DkMYJ+h6yUDLdKBbhXnhY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eQeVczusYWQxKj2pBCyQ+sJXo8FpMNkBUT1ONk8a9zs9+ZUGcm5LgRjoCaRzg+d2s slStsztFKcbIwTHEdnewzNe7iqBTTjxD6wNlrPP5zN+fELgADqhDN4dDQY2qxWef/u C3K+t5oKaJzjUz9pcvIHXnGoKhkKmjaj2aAb1RDA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xu Yu , Yang Shi , Miaohe Lin , Naoya Horiguchi , Andrew Morton Subject: [PATCH 5.17 093/114] Revert "mm/memory-failure.c: skip huge_zero_page in memory_failure()" Date: Mon, 16 May 2022 21:37:07 +0200 Message-Id: <20220516193628.145429320@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193625.489108457@linuxfoundation.org> References: <20220516193625.489108457@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Xu Yu commit b4e61fc031b11dd807dffc46cebbf0e25966d3d1 upstream. Patch series "mm/memory-failure: rework fix on huge_zero_page splitting". This patch (of 2): This reverts commit d173d5417fb67411e623d394aab986d847e47dad. The commit d173d5417fb6 ("mm/memory-failure.c: skip huge_zero_page in memory_failure()") explicitly skips huge_zero_page in memory_failure(), in order to avoid triggering VM_BUG_ON_PAGE on huge_zero_page in split_huge_page_to_list(). This works, but Yang Shi thinks that, Raising BUG is overkilling for splitting huge_zero_page. The huge_zero_page can't be met from normal paths other than memory failure, but memory failure is a valid caller. So I tend to replace the BUG to WARN + returning -EBUSY. If we don't care about the reason code in memory failure, we don't have to touch memory failure. And for the issue that huge_zero_page will be set PG_has_hwpoisoned, Yang Shi comments that, The anonymous page fault doesn't check if the page is poisoned or not since it typically gets a fresh allocated page and assumes the poisoned page (isolated successfully) can't be reallocated again. But huge zero page and base zero page are reused every time. So no matter what fix we pick, the issue is always there. Finally, Yang, David, Anshuman and Naoya all agree to fix the bug, i.e., to split huge_zero_page, in split_huge_page_to_list(). This reverts the commit d173d5417fb6 ("mm/memory-failure.c: skip huge_zero_page in memory_failure()"), and the original bug will be fixed by the next patch. Link: https://lkml.kernel.org/r/872cefb182ba1dd686b0e7db1e6b2ebe5a4fff87.1651039624.git.xuyu@linux.alibaba.com Fixes: d173d5417fb6 ("mm/memory-failure.c: skip huge_zero_page in memory_failure()") Fixes: 6a46079cf57a ("HWPOISON: The high level memory error handler in the VM v7") Signed-off-by: Xu Yu Suggested-by: Yang Shi Reviewed-by: Yang Shi Reviewed-by: Miaohe Lin Cc: Naoya Horiguchi Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- mm/memory-failure.c | 13 ------------- 1 file changed, 13 deletions(-) --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1782,19 +1782,6 @@ try_again: if (PageTransHuge(hpage)) { /* - * Bail out before SetPageHasHWPoisoned() if hpage is - * huge_zero_page, although PG_has_hwpoisoned is not - * checked in set_huge_zero_page(). - * - * TODO: Handle memory failure of huge_zero_page thoroughly. - */ - if (is_huge_zero_page(hpage)) { - action_result(pfn, MF_MSG_UNSPLIT_THP, MF_IGNORED); - res = -EBUSY; - goto unlock_mutex; - } - - /* * The flag must be set after the refcount is bumped * otherwise it may race with THP split. * And the flag can't be set in get_hwpoison_page() since