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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4170CC07E95 for ; Tue, 13 Jul 2021 05:53:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 23ADA61004 for ; Tue, 13 Jul 2021 05:53:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232634AbhGMFzv (ORCPT ); Tue, 13 Jul 2021 01:55:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38786 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229782AbhGMFze (ORCPT ); Tue, 13 Jul 2021 01:55:34 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 67440C0613E9 for ; Mon, 12 Jul 2021 22:52:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=zp53bommybp1pk8ZrcPSSkhx3IAKKWZGzNvK/RyWeR0=; b=dcklGLuH/tB3sRJG6nd0c8BFWh VT5aqHFrCB6W1Hsv/Mi4HNEhcZ6CGseY2EXexBSNuphOkV+25bEBLg3H3UwxB8plA/yfBx87/imtu 9/N4DHy5sGRxFl2f3zcigHtc4bbHlpmSoQf0NjBp0LSv4z1D7f26rwrCcUoACx83M3hJIdG9SDdvF zmA8Fe7BY9LwIyMrtS9c/5Tg9LBam9Rf8GzS+0BCb5q3OIL5V/wzNPvXkxK2Qb/5HumbxxXhqr4iy JytL/aq4PoyynRtDUaZtiXUmrzOLfRf1LI8b5R/8JaoK3ySgE5HkwJkG0QYuw81uT2DxRklOQ1ihr cqaGSXpQ==; Received: from [2001:4bb8:184:8b7c:e5e6:2d8f:6506:596e] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1m3BLS-000mbI-Hs; Tue, 13 Jul 2021 05:52:39 +0000 From: Christoph Hellwig To: Andrew Morton Cc: Ira Weiny , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 1/2] mm: call flush_dcache_page in memcpy_to_page and memzero_page Date: Tue, 13 Jul 2021 07:52:30 +0200 Message-Id: <20210713055231.137602-2-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210713055231.137602-1-hch@lst.de> References: <20210713055231.137602-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org memcpy_to_page and memzero_page can write to arbitrary pages, which could be in the page cache or in high memory, so call flush_kernel_dcache_pages to flush the dcache. Fixes: bb90d4bc7b6a ("mm/highmem: Lift memcpy_[to|from]_page to core") Fixes: 28961998f858 ("iov_iter: lift memzero_page() to highmem.h") Signed-off-by: Christoph Hellwig --- include/linux/highmem.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 8c6e8e996c87..8e7e50a53a12 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -318,6 +318,7 @@ static inline void memcpy_to_page(struct page *page, size_t offset, VM_BUG_ON(offset + len > PAGE_SIZE); memcpy(to + offset, from, len); + flush_dcache_page(page); kunmap_local(to); } @@ -325,6 +326,7 @@ static inline void memzero_page(struct page *page, size_t offset, size_t len) { char *addr = kmap_atomic(page); memset(addr + offset, 0, len); + flush_dcache_page(page); kunmap_atomic(addr); } -- 2.30.2