From patchwork Wed Jun 3 23:31:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 11586673 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 795F61667 for ; Wed, 3 Jun 2020 23:33:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5F792207D3 for ; Wed, 3 Jun 2020 23:33:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="YTEneSOL" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726541AbgFCXdM (ORCPT ); Wed, 3 Jun 2020 19:33:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55646 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726480AbgFCXcX (ORCPT ); Wed, 3 Jun 2020 19:32:23 -0400 Received: from mail-pf1-x444.google.com (mail-pf1-x444.google.com [IPv6:2607:f8b0:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AD4E6C0085C1 for ; Wed, 3 Jun 2020 16:32:18 -0700 (PDT) Received: by mail-pf1-x444.google.com with SMTP id b201so2510208pfb.0 for ; Wed, 03 Jun 2020 16:32:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=3Hqe0fSnXDR9BQhToHGwDvWeXmOn6wXlTM1ZNtQBNo0=; b=YTEneSOLG0G03VL7npO7bUdyovAOz/rWIhWyhFR63irmezy8TdYcAkK240HUiwVQWE l1+wS3Zsf9sMrntm2h4pD25VpYQ6IwLesvsppd1RMdvcr3jcMToX3FgASNyJIcm+17M+ RgKR5xqROZSaXLSFW/JQA7YcOaR/t1jFVii4U= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=3Hqe0fSnXDR9BQhToHGwDvWeXmOn6wXlTM1ZNtQBNo0=; b=cbNBL5/fu+49zFjaJWIHrwWe63WEz2kQ6LxgHjXTwIzkUTx85WWQKMCOwNXNoXWxgy dU3ANez4jsNkqCTXHc6yoXCn6+4s3ViVONavBDhIKDoVEwZ4/u1tskHOYkFSFEICMPn5 rp3KMBANG2bELAjRnWXJCMuFJ1ZruVKtZSJx3x+K4NxL3ifFbevW3vwF08ruWKN+FQOI WBcKofAzIRdTDf0+8yb3UGP/LsAS/aAj9pM2xLJh0+G5E8Pjp+KVLb4qApmIH5QqOz/+ BA4x16esDWTUslqa2MdiB5u7tR2IO08mismKlYOvsXzd89q3LZVu/rSidHk8ohVJ3qgB hkJQ== X-Gm-Message-State: AOAM532P1d1E2oKVNXpH7dvzq/FoCXqC4n5pvbbMFhWdh7h2Bbfa454Z yaQPlmQK2QUz+2cfqG0LkaFaZw== X-Google-Smtp-Source: ABdhPJyfJH3U7PUxTmeWYwI+KnsyVJ3CXtEz238mctrUyUOZNrrAJx63byFxfj5FXVnOwJj3WTFGgg== X-Received: by 2002:a65:41c8:: with SMTP id b8mr1632114pgq.265.1591227138290; Wed, 03 Jun 2020 16:32:18 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id l3sm3402369pju.43.2020.06.03.16.32.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jun 2020 16:32:16 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Linus Torvalds , Miguel Ojeda , Alexander Potapenko , Joe Perches , Andy Whitcroft , x86@kernel.org, drbd-dev@lists.linbit.com, linux-block@vger.kernel.org, b43-dev@lists.infradead.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-ide@vger.kernel.org, linux-clk@vger.kernel.org, linux-spi@vger.kernel.org, linux-mm@kvack.org, clang-built-linux@googlegroups.com Subject: [PATCH 05/10] ide: Remove uninitialized_var() usage Date: Wed, 3 Jun 2020 16:31:58 -0700 Message-Id: <20200603233203.1695403-6-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200603233203.1695403-1-keescook@chromium.org> References: <20200603233203.1695403-1-keescook@chromium.org> MIME-Version: 1.0 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Using uninitialized_var() is dangerous as it papers over real bugs[1] (or can in the future), and suppresses unrelated compiler warnings (e.g. "unused variable"). If the compiler thinks it is uninitialized, either simply initialize the variable or make compiler changes. As a precursor to removing[2] this[3] macro[4], just remove this variable since it was actually unused: drivers/ide/ide-taskfile.c:232:34: warning: unused variable 'flags' [-Wunused-variable] unsigned long uninitialized_var(flags); ^ [1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/ [2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/ [3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/ [4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/ Signed-off-by: Kees Cook Reviewed-by: Nick Desaulniers --- drivers/ide/ide-taskfile.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c index aab6a10435b6..a26f85ab58a9 100644 --- a/drivers/ide/ide-taskfile.c +++ b/drivers/ide/ide-taskfile.c @@ -229,7 +229,6 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd, ide_hwif_t *hwif = drive->hwif; struct scatterlist *sg = hwif->sg_table; struct scatterlist *cursg = cmd->cursg; - unsigned long uninitialized_var(flags); struct page *page; unsigned int offset; u8 *buf;