From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 004BBC982D8 for ; Fri, 16 Jan 2026 16:27:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=FAf1EpB3RHV5nguc56M5OiGGTGDZlSOZIyII2hjqUoc=; b=NpXPN7EtjRdlBZj83mb4Xt0Msi FywoxTNynEBcxsXMqUnDRJOm6JoTrkUnnS89HJdb7EfE0wI8+0KeO5HuIg0NtN8IMx/DWTjDnKHYc x5GrC7RdTCp7nFCLnr0IyeSq/tjrDD+lGkBUh7f7x21Lx0WZIe9apDBY7b5I1MSu+s4aCVVssCBIb T+8HnkzfoT78G7kBN6ljzLvniV7bxABGJijqEW7D9b716AviB8o0zNerNDsTxXCEdlT1UmSSxcxWs /jL0xGOARaFRgwrOHtRpR2PcM9Ir/US2JeVne/MhpWX8k/GnGDzp+/XFjU+UYACvbNdQqUvWX6g/T QXnQ05aw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vgmfI-0000000ESpx-3SXZ; Fri, 16 Jan 2026 16:27:12 +0000 Received: from out30-113.freemail.mail.aliyun.com ([115.124.30.113]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vgmfD-0000000ESpR-0YIi for linux-arm-kernel@lists.infradead.org; Fri, 16 Jan 2026 16:27:10 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1768580819; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=FAf1EpB3RHV5nguc56M5OiGGTGDZlSOZIyII2hjqUoc=; b=Wgsww7VBCiHvKyvUe95Z7ZBlP4hCY7rICkPcYK5nCXNgTOdbhXGn6u6xWGwPKadfZuXPrhO3VWG67+wP6PwozlacGuuqD6+i2Rkoj1a+rv1e4ahhxTxX31UI8WBgHakXpqgO+ie36Jclll3HlgMzfi5mcpXF8vD1567qGEs6LJc= Received: from localhost(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0WxAk08M_1768580817 cluster:ay36) by smtp.aliyun-inc.com; Sat, 17 Jan 2026 00:26:58 +0800 From: Baolin Wang To: baolin.wang@linux.alibaba.com Cc: Liam.Howlett@oracle.com, akpm@linux-foundation.org, baohua@kernel.org, catalin.marinas@arm.com, david@kernel.org, dev.jain@arm.com, harry.yoo@oracle.com, jannh@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, mhocko@suse.com, riel@surriel.com, rppt@kernel.org, ryan.roberts@arm.com, surenb@google.com, vbabka@suse.cz, will@kernel.org, willy@infradead.org Subject: [PATCH] mm: rmap: skip batched unmapping for UFFD vmas Date: Sat, 17 Jan 2026 00:26:52 +0800 Message-ID: <20260116162652.176054-1-baolin.wang@linux.alibaba.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <142919ac14d3cf70cba370808d85debe089df7b4.1766631066.git.baolin.wang@linux.alibaba.com> References: <142919ac14d3cf70cba370808d85debe089df7b4.1766631066.git.baolin.wang@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260116_082708_795323_09971954 X-CRM114-Status: UNSURE ( 7.80 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org As Dev reported[1], it's not ready to support batched unmapping for uffd case. Let's still fallback to per-page unmapping for the uffd case. [1] https://lore.kernel.org/linux-mm/20260116082721.275178-1-dev.jain@arm.com/ Reported-by: Dev Jain Suggested-by: Barry Song Signed-off-by: Baolin Wang --- mm/rmap.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/rmap.c b/mm/rmap.c index f13480cb9f2e..172643092dcf 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1953,6 +1953,9 @@ static inline unsigned int folio_unmap_pte_batch(struct folio *folio, if (pte_unused(pte)) return 1; + if (userfaultfd_wp(vma)) + return 1; + return folio_pte_batch(folio, pvmw->pte, pte, max_nr); } -- 2.47.3