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 CA5EFC433F5 for ; Wed, 6 Apr 2022 10:39:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=toouDrVapzOycvYxw+4bwtVM/6wqpoAAtrF0wffe4Uc=; b=SpPgs+BOk+plAs Qg26BzrH10pmTH0XBBhzwgTIRn3tM1ISJmGb0I/mWA95WWhril4U7ayyTdr+M65q3XDTPZFfnGipl 8kvQ0TPq/MjLhKAoUWAaWHu/yab9IBLbzLUL9oyKQ6z/cPO9m+XvC2+pLZFnBGRrSg9KLC5YT2kkq NJsegFceE9htcEj9Wz06XOCnFKqYposFD9kKg7dXT1QWT3c92TDJ4JFPKey1xAqDuh5QwbhbqQbOm lTedDVqPVMw0PuSsme2bg5Nf/U45G5i5KrI0QU1nDSPUPJXqlLKL0zjl0LJW5og/qP0IMT+AWW2X/ hkCdGhQo+HbifPvtvJ/Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nc33A-005Rb8-9Y; Wed, 06 Apr 2022 10:38:08 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nc2nm-005Kbj-Qy for linux-arm-kernel@lists.infradead.org; Wed, 06 Apr 2022 10:22:16 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5C97C23A; Wed, 6 Apr 2022 03:22:13 -0700 (PDT) Received: from FVFF77S0Q05N (unknown [10.57.10.98]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1A93D3F718; Wed, 6 Apr 2022 03:22:10 -0700 (PDT) Date: Wed, 6 Apr 2022 11:22:07 +0100 From: Mark Rutland To: Tong Tiangen Cc: Andrew Morton , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Catalin Marinas , Will Deacon , Alexander Viro , x86@kernel.org, "H. Peter Anvin" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Vincenzo Frascino Subject: Re: [RFC PATCH -next V2 2/7] arm64: fix page_address return value in copy_highpage Message-ID: References: <20220406091311.3354723-1-tongtiangen@huawei.com> <20220406091311.3354723-3-tongtiangen@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220406091311.3354723-3-tongtiangen@huawei.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220406_032214_976191_E88AEADC X-CRM114-Status: GOOD ( 21.29 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Apr 06, 2022 at 09:13:06AM +0000, Tong Tiangen wrote: > Function page_address return void, fix it. > > Signed-off-by: Tong Tiangen This looks like a sensible cleanup, but the commit title and message aren't that clear. Can you please make this: | arm64: fix types in copy_highpage() | | In copy_highpage() the `kto` and `kfrom` local variables are pointers to | struct page, but these are used to hold arbitrary pointers to kernel memory. | Each call to page_address() returns a void pointer to memory associated with | the relevant page, and copy_page() expects void pointers to this memory. | | This inconsistency was introduced in commit: | | 2563776b41c31908 ("arm64: mte: Tags-aware copy_{user_,}highpage() implementations") | | ... and while this doesn't appear to be harmful in practice it is clearly wrong. | | Correct this by making `kto` and `kfrom` void pointers. | | Fixes: 2563776b41c31908 ("arm64: mte: Tags-aware copy_{user_,}highpage() implementations") With that: Acked-by: Mark Rutland Thanks, Mark. > --- > arch/arm64/mm/copypage.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/mm/copypage.c b/arch/arm64/mm/copypage.c > index b5447e53cd73..0dea80bf6de4 100644 > --- a/arch/arm64/mm/copypage.c > +++ b/arch/arm64/mm/copypage.c > @@ -16,8 +16,8 @@ > > void copy_highpage(struct page *to, struct page *from) > { > - struct page *kto = page_address(to); > - struct page *kfrom = page_address(from); > + void *kto = page_address(to); > + void *kfrom = page_address(from); > > copy_page(kto, kfrom); > > -- > 2.18.0.huawei.25 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel