From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6A2848BE0 for ; Mon, 28 Aug 2023 10:46:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E2AF3C433C8; Mon, 28 Aug 2023 10:46:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1693219606; bh=GGy72m5RuqyQjFBIfb+AsjUCn8kN/SQq/qh5bteSykc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fKiPK/a54dJNoYyvaVFs53prXVgcaoX1c3folC8oR2zUzb+iVfecr6DHjDSUCi2vo OCeC1CAHSsFDHGsBYbpmySQIWto5WbQ+ZXn2rGZI8CTwvILTEg+Jof275ROLtFjAbc G1VeG06Ex1UPjJsAb/hh857iUAZPLm6d9ZXGv5QM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Miaohe Lin , Naoya Horiguchi , Andrew Morton , Sasha Levin Subject: [PATCH 5.15 88/89] mm: memory-failure: fix unexpected return value in soft_offline_page() Date: Mon, 28 Aug 2023 12:14:29 +0200 Message-ID: <20230828101153.216728715@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230828101150.163430842@linuxfoundation.org> References: <20230828101150.163430842@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Miaohe Lin [ Upstream commit e2c1ab070fdc81010ec44634838d24fce9ff9e53 ] When page_handle_poison() fails to handle the hugepage or free page in retry path, soft_offline_page() will return 0 while -EBUSY is expected in this case. Consequently the user will think soft_offline_page succeeds while it in fact failed. So the user will not try again later in this case. Link: https://lkml.kernel.org/r/20230627112808.1275241-1-linmiaohe@huawei.com Fixes: b94e02822deb ("mm,hwpoison: try to narrow window race for free pages") Signed-off-by: Miaohe Lin Acked-by: Naoya Horiguchi Cc: Signed-off-by: Andrew Morton Signed-off-by: Sasha Levin --- mm/memory-failure.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 69d22af10adfc..bcd71d8736be5 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -2284,10 +2284,13 @@ int soft_offline_page(unsigned long pfn, int flags) if (ret > 0) { ret = soft_offline_in_use_page(page); } else if (ret == 0) { - if (!page_handle_poison(page, true, false) && try_again) { - try_again = false; - flags &= ~MF_COUNT_INCREASED; - goto retry; + if (!page_handle_poison(page, true, false)) { + if (try_again) { + try_again = false; + flags &= ~MF_COUNT_INCREASED; + goto retry; + } + ret = -EBUSY; } } -- 2.40.1