From patchwork Tue Sep 5 16:15:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Josef Bacik X-Patchwork-Id: 13374809 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD87DCA0FF3 for ; Tue, 5 Sep 2023 16:42:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240841AbjIEQmR (ORCPT ); Tue, 5 Sep 2023 12:42:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49348 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347352AbjIEQRt (ORCPT ); Tue, 5 Sep 2023 12:17:49 -0400 Received: from mail-qt1-x834.google.com (mail-qt1-x834.google.com [IPv6:2607:f8b0:4864:20::834]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5914A198A for ; Tue, 5 Sep 2023 09:17:07 -0700 (PDT) Received: by mail-qt1-x834.google.com with SMTP id d75a77b69052e-414b0bdea1cso18040851cf.1 for ; Tue, 05 Sep 2023 09:17:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=toxicpanda-com.20230601.gappssmtp.com; s=20230601; t=1693930531; x=1694535331; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=EmYmqap4MEl+WNijUh97ca11ozjINI/sVf8zC35dAHQ=; b=Td7UCP7EYU9J5MA2c+KmxyDGNoKSw/EeI6ccHIn784nZwus9QYay7tmiWWOts0i4QX HjBQL+5PpX4VnGx9SXJfCvjWm0HK0kXuiH+n7E6/LnED3it8xMdsf9HiGPxIqW3Jcp2S DJDpfBUVy9o3lz3rsZZUAeQWBhJJxUih4oad3Cf8HKIcW1yAirN63MrHWidaL8oRZ/Bh ALGtlkkfmCwI1I/piBDqmSnl7aK0JK3lcXJH3hhd6X72DgaPVasTEoVrVUZb/m02pTyf UTeMIm/Q4K51y7k8tYMO3rXhjW2i5lrqVUT3wJOws77b/ika6Do4uLtCK80dXv9QeK0r sj2w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693930531; x=1694535331; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=EmYmqap4MEl+WNijUh97ca11ozjINI/sVf8zC35dAHQ=; b=UOqBK1ekIZeYXSkZvU9zGT9wY9RFNqVq/K1Pa+tSBvOK/BCRFYc6vPh0MWUrw/uaz9 jkpEvHeauViuA6dMQUZ3kQqAOqLs8bjMRbqZrhyhSsYk2sCF7RjKfLLfAzfGm4r6O3O7 SyqsYyl6ca05/tcSx5De9VudDuURQur9ZgAbUaYW4MQCiWoi9k92zwXyFt93SN86pSP3 WMjuhUbUhrV8XOttZx9xxESz/xp+wviLREcVPXcdtgimE/tqt6N/rjUUIxfB0OlKZH7V EODyqsa2OsCPqtxIJ3dDDFkIltcGrVs/ZC55DW3ZyHjj7pUflA2b+jKLu5B95TyV6y1a TheA== X-Gm-Message-State: AOJu0Yxuu+UsDm1r252s+RNwfOY8GH5t5v5AbHFUDK0ASxZGqnaB/KB1 Ps5IVgkeoSHULrIDdur+fQaL1emUASjpcs24klU= X-Google-Smtp-Source: AGHT+IFk6SEm7uudHruaBpP8y06xQTuQBuSup9Cvaw17FKPGXlFwLpkj+6uqvFl0PeAObCnp7L3WEQ== X-Received: by 2002:ad4:4582:0:b0:64a:157:1d01 with SMTP id x2-20020ad44582000000b0064a01571d01mr12340062qvu.4.1693930530989; Tue, 05 Sep 2023 09:15:30 -0700 (PDT) Received: from localhost (cpe-76-182-20-124.nc.res.rr.com. [76.182.20.124]) by smtp.gmail.com with ESMTPSA id e1-20020a0ce3c1000000b0063d2a70dff5sm4567134qvl.72.2023.09.05.09.15.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Sep 2023 09:15:30 -0700 (PDT) From: Josef Bacik To: linux-btrfs@vger.kernel.org, kernel-team@fb.com Cc: Jens Axboe Subject: [PATCH 2/2] btrfs: initialize start_slot in btrfs_log_prealloc_extents Date: Tue, 5 Sep 2023 12:15:24 -0400 Message-ID: X-Mailer: git-send-email 2.41.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Jens reported a compiler warning when using CONFIG_CC_OPTIMIZE_FOR_SIZE=y that looks like this fs/btrfs/tree-log.c: In function ‘btrfs_log_prealloc_extents’: fs/btrfs/tree-log.c:4828:23: warning: ‘start_slot’ may be used uninitialized [-Wmaybe-uninitialized] 4828 | ret = copy_items(trans, inode, dst_path, path, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4829 | start_slot, ins_nr, 1, 0); | ~~~~~~~~~~~~~~~~~~~~~~~~~ fs/btrfs/tree-log.c:4725:13: note: ‘start_slot’ was declared here 4725 | int start_slot; | ^~~~~~~~~~ The compiler is incorrect, as we only use this code when ins_len > 0, and when ins_len > 0 we have start_slot properly initialized. However we generally find the -Wmaybe-uninitialized warnings valuable, so initialize start_slot to get rid of the warning. Reported-by: Jens Axboe Signed-off-by: Josef Bacik Tested-by: Jens Axboe --- fs/btrfs/tree-log.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index d1e46b839519..cbb17b542131 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -4722,7 +4722,7 @@ static int btrfs_log_prealloc_extents(struct btrfs_trans_handle *trans, struct extent_buffer *leaf; int slot; int ins_nr = 0; - int start_slot; + int start_slot = 0; int ret; if (!(inode->flags & BTRFS_INODE_PREALLOC))