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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 67E8CC35247 for ; Mon, 3 Feb 2020 16:47:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3E6802051A for ; Mon, 3 Feb 2020 16:47:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580748453; bh=To2YoZKzBrf7+VzpiwJuMw7MK7JCBI+Y3XIpxGE4wZc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=yA3k4rPDVHHvVlxbypBrMqI34RVSxErjgZDFGv2/35OD60h+dxjWCCTnb/q2kDn9w 2SY+TbFOB25vWpRTEhNhWPqVyHGdDLSxMLSIbCYuardbttMr+sYn/iVfW7zHgbM4zh Bx6oQTYukOXzwqzdj4+E3tWb5FaSx/EVsvO0/P04= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729818AbgBCQrc (ORCPT ); Mon, 3 Feb 2020 11:47:32 -0500 Received: from mail.kernel.org ([198.145.29.99]:38612 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729385AbgBCQ1W (ORCPT ); Mon, 3 Feb 2020 11:27:22 -0500 Received: from localhost (unknown [104.132.45.99]) (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 327642087E; Mon, 3 Feb 2020 16:27:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580747241; bh=To2YoZKzBrf7+VzpiwJuMw7MK7JCBI+Y3XIpxGE4wZc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OTKb0F8PGcM9gyJM/b4IKzWiRHcf1/jfCkM9Kw0hCQOqDmsz6XdPoLu2pH1jKsWOu sO2LDs3ck3fL0LXW1jQktrzPSMer3cz4m16c3v+UEPtere3AvNPr8DwvcXlpv0f9d8 mPtQ2iFozuEFERoG/mncRrcj/fKjh5wEUWp+UVXI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Arnd Bergmann , Johannes Berg , Sasha Levin Subject: [PATCH 4.9 50/68] wireless: wext: avoid gcc -O3 warning Date: Mon, 3 Feb 2020 16:19:46 +0000 Message-Id: <20200203161913.188652325@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200203161904.705434837@linuxfoundation.org> References: <20200203161904.705434837@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnd Bergmann [ Upstream commit e16119655c9e6c4aa5767cd971baa9c491f41b13 ] After the introduction of CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3, the wext code produces a bogus warning: In function 'iw_handler_get_iwstats', inlined from 'ioctl_standard_call' at net/wireless/wext-core.c:1015:9, inlined from 'wireless_process_ioctl' at net/wireless/wext-core.c:935:10, inlined from 'wext_ioctl_dispatch.part.8' at net/wireless/wext-core.c:986:8, inlined from 'wext_handle_ioctl': net/wireless/wext-core.c:671:3: error: argument 1 null where non-null expected [-Werror=nonnull] memcpy(extra, stats, sizeof(struct iw_statistics)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from arch/x86/include/asm/string.h:5, net/wireless/wext-core.c: In function 'wext_handle_ioctl': arch/x86/include/asm/string_64.h:14:14: note: in a call to function 'memcpy' declared here The problem is that ioctl_standard_call() sometimes calls the handler with a NULL argument that would cause a problem for iw_handler_get_iwstats. However, iw_handler_get_iwstats never actually gets called that way. Marking that function as noinline avoids the warning and leads to slightly smaller object code as well. Signed-off-by: Arnd Bergmann Link: https://lore.kernel.org/r/20200107200741.3588770-1-arnd@arndb.de Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- net/wireless/wext-core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/wireless/wext-core.c b/net/wireless/wext-core.c index 6250b1cfcde58..4bf0296a7c433 100644 --- a/net/wireless/wext-core.c +++ b/net/wireless/wext-core.c @@ -659,7 +659,8 @@ struct iw_statistics *get_wireless_stats(struct net_device *dev) return NULL; } -static int iw_handler_get_iwstats(struct net_device * dev, +/* noinline to avoid a bogus warning with -O3 */ +static noinline int iw_handler_get_iwstats(struct net_device * dev, struct iw_request_info * info, union iwreq_data * wrqu, char * extra) -- 2.20.1