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=-3.8 required=3.0 tests=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 07103C35247 for ; Tue, 4 Feb 2020 01:34:55 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B49302084E for ; Tue, 4 Feb 2020 01:34:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="BTSYJ9Te" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B49302084E 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 626CE6B000A; Mon, 3 Feb 2020 20:34:54 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 5B3BD6B027A; Mon, 3 Feb 2020 20:34:54 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4A4836B027B; Mon, 3 Feb 2020 20:34:54 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0115.hostedemail.com [216.40.44.115]) by kanga.kvack.org (Postfix) with ESMTP id 2C2CB6B000A for ; Mon, 3 Feb 2020 20:34:54 -0500 (EST) Received: from smtpin16.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id C337E2DFA for ; Tue, 4 Feb 2020 01:34:53 +0000 (UTC) X-FDA: 76450725666.16.shade22_d97a5e3f733d X-HE-Tag: shade22_d97a5e3f733d X-Filterd-Recvd-Size: 2848 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf35.hostedemail.com (Postfix) with ESMTP for ; Tue, 4 Feb 2020 01:34:53 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (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 8264F2087E; Tue, 4 Feb 2020 01:34:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580780092; bh=hgj2WyZaUcEhh/u1Ju5AZzyHSQM1J5kG5swrKAJ2Sro=; h=Date:From:To:Subject:In-Reply-To:From; b=BTSYJ9TeSX0bbzBDT3QDm3vY4XyR4f8Tzl52E/51eDojlMX8rn7FYu8lFUUTEtmjp 8x1PyY/Dw8q7mpAtdUTXULo3PTBe6i11b2BhyB4+VsPfFS9OtQ+g50LpJEv8NykUE/ ua80ffG0KxdPQ5e27nPCqRsGGYL7eFhFwIzqXwFQ= Date: Mon, 03 Feb 2020 17:34:52 -0800 From: Andrew Morton To: akpm@linux-foundation.org, axboe@kernel.dk, linux-mm@kvack.org, mm-commits@vger.kernel.org, shli@fb.com, torvalds@linux-foundation.org Subject: [patch 21/67] drivers/block/null_blk_main.c: fix uninitialized var warnings Message-ID: <20200204013452.zc3h7QOdS%akpm@linux-foundation.org> In-Reply-To: <20200203173311.6269a8be06a05e5a4aa08a93@linux-foundation.org> User-Agent: s-nail v14.8.16 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable 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: =46rom: Andrew Morton Subject: drivers/block/null_blk_main.c: fix uninitialized var warnings With gcc-7.2, many instances of drivers/block/null_blk_main.c: In function =E2=80=98nullb_device_zone_nr_co= nv_store=E2=80=99: drivers/block/null_blk_main.c:291:12: warning: =E2=80=98new_value=E2=80=99 = may be used uninitialized in this function [-Wmaybe-uninitialized] dev->NAME =3D new_value; \ ^ drivers/block/null_blk_main.c:279:7: note: =E2=80=98new_value=E2=80=99 was = declared here TYPE new_value; \ ^ Presumably notabug, so use uninitialized_var() to suppress them. Cc: Shaohua Li Cc: Jens Axboe Signed-off-by: Andrew Morton --- drivers/block/null_blk_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/block/null_blk_main.c~drivers-block-null_blk_mainc-fix-uninit= ialized-var-warnings +++ a/drivers/block/null_blk_main.c @@ -276,7 +276,7 @@ nullb_device_##NAME##_store(struct confi { \ int (*apply_fn)(struct nullb_device *dev, TYPE new_value) =3D APPLY;\ struct nullb_device *dev =3D to_nullb_device(item); \ - TYPE new_value; \ + TYPE uninitialized_var(new_value); \ int ret; \ \ ret =3D nullb_device_##TYPE##_attr_store(&new_value, page, count);\ _