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=-8.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 D3570C47426 for ; Sat, 26 Sep 2020 04:19:27 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6B3282080A for ; Sat, 26 Sep 2020 04:19:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="ARY3by6I" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6B3282080A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 07F616B0072; Sat, 26 Sep 2020 00:19:27 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0302A6B0073; Sat, 26 Sep 2020 00:19:26 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EADE36B0074; Sat, 26 Sep 2020 00:19:26 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0208.hostedemail.com [216.40.44.208]) by kanga.kvack.org (Postfix) with ESMTP id D54AC6B0072 for ; Sat, 26 Sep 2020 00:19:26 -0400 (EDT) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 964E65821 for ; Sat, 26 Sep 2020 04:19:26 +0000 (UTC) X-FDA: 77303908332.01.spy63_4a03e7f2716d Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin01.hostedemail.com (Postfix) with ESMTP id 85624100520F1 for ; Sat, 26 Sep 2020 04:19:26 +0000 (UTC) X-HE-Tag: spy63_4a03e7f2716d X-Filterd-Recvd-Size: 3373 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf44.hostedemail.com (Postfix) with ESMTP for ; Sat, 26 Sep 2020 04:19:26 +0000 (UTC) Received: from localhost.localdomain (c-71-198-47-131.hsd1.ca.comcast.net [71.198.47.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DF92D207C4; Sat, 26 Sep 2020 04:19:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601093965; bh=4XYbOkZD/X+maFrZDRd5RAzqJJ9LoJUpJToY3T3h3R0=; h=Date:From:To:Subject:In-Reply-To:From; b=ARY3by6ITqp2ZnsjOsPvXl+rGGDcHv8XbLOpId2hoXAJYDuU33VhrEDACHeGCnZjR 9n91SUl1xCKp3tjXuT8Qf0r7v9lmsrcvsunSEVd4++RIROvmA21hg5jWaBnCAd9vFX cwn6ysHBq1VfNYgqtGTRudh+891wxKG0QhjTznM0= Date: Fri, 25 Sep 2020 21:19:24 -0700 From: Andrew Morton To: akpm@linux-foundation.org, dan.j.wiilliams@intel.com, hch@lst.de, hpa@zytor.com, jack@suse.cz, jmoyer@redhat.com, linux-mm@kvack.org, mawilcox@microsoft.com, mingo@elte.hu, mingo@redhat.com, mm-commits@vger.kernel.org, mpatocka@redhat.com, ross.zwisler@linux.intel.com, stable@vger.kernel.org, tglx@linutronix.de, torvalds@linux-foundation.org, toshi.kani@hpe.com, viro@zeniv.linux.org.uk Subject: [patch 7/9] arch/x86/lib/usercopy_64.c: fix __copy_user_flushcache() cache writeback Message-ID: <20200926041924.JrUcL1D_9%akpm@linux-foundation.org> In-Reply-To: <20200925211725.0fea54be9e9715486efea21f@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Mikulas Patocka Subject: arch/x86/lib/usercopy_64.c: fix __copy_user_flushcache() cache writeback If we copy less than 8 bytes and if the destination crosses a cache line, __copy_user_flushcache would invalidate only the first cache line. This patch makes it invalidate the second cache line as well. Link: https://lkml.kernel.org/r/alpine.LRH.2.02.2009161451140.21915@file01.intranet.prod.int.rdu2.redhat.com Fixes: 0aed55af88345b ("x86, uaccess: introduce copy_from_iter_flushcache for pmem / cache-bypass operations") Signed-off-by: Mikulas Patocka Reviewed-by: Dan Williams Cc: Jan Kara Cc: Jeff Moyer Cc: Ingo Molnar Cc: Christoph Hellwig Cc: Toshi Kani Cc: "H. Peter Anvin" Cc: Al Viro Cc: Thomas Gleixner Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Signed-off-by: Andrew Morton --- arch/x86/lib/usercopy_64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/x86/lib/usercopy_64.c~arch-x86-lib-usercopy_64c-fix-__copy_user_flushcache-cache-writeback +++ a/arch/x86/lib/usercopy_64.c @@ -120,7 +120,7 @@ long __copy_user_flushcache(void *dst, c */ if (size < 8) { if (!IS_ALIGNED(dest, 4) || size != 4) - clean_cache_range(dst, 1); + clean_cache_range(dst, size); } else { if (!IS_ALIGNED(dest, 8)) { dest = ALIGN(dest, boot_cpu_data.x86_clflush_size); _