From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7668A1DA4C; Tue, 10 Sep 2024 10:45:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725965131; cv=none; b=GFzSco5Rj/89z4+FFgafBzHO9ok9//dQg4J588q1dP5IgHtzRNzGH9Cy+g47rtLrr0hzTf3Ip4NDxnTE99qnR2etUKBCtS1zDXxsaNzoJRxITweL2HAB4krQ8xIeXlwNdnHOseN7s9RjP0dNDmK9Gg6wETGg52elmCW39TWbjcc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725965131; c=relaxed/simple; bh=q0AennzIc/1s39LuIGlQ0iX9gCNjSfzA10/kSlf2SzM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MvRwG/isfjegeOlwiEATFxV5uxnX+lce+h6RXSLOetvAfveZh9SoyNyBGWeCvkBtohnFIXIsmMy4O2RqCp5qvSDir7emruIPsCgw4RHEplz6TU7tD5cn0rCk64K72dANiOFKMaP1+ltHdxiqOoOaWCdtr4QQ7u+PZhDrnVwpaU4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0sxe+fb7; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="0sxe+fb7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F24A8C4CEC3; Tue, 10 Sep 2024 10:45:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1725965131; bh=q0AennzIc/1s39LuIGlQ0iX9gCNjSfzA10/kSlf2SzM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0sxe+fb78csD2yaif75gN8ipZ4HSb8PFskblUKzBhHYywA2vjUmqA2W5e21d1bfa5 2ed5JNAwO9wfot6ipThm5loEhkhOM9VDEGtn5r8cfO4USSswCmIFibixOnvwbx8zwB 0KK00MIcZRM6P8vwgSc7u89Bu49ZPpsOVbu0NazE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Geert Uytterhoeven , Qu Wenruo , David Sterba , Sasha Levin Subject: [PATCH 5.10 147/186] btrfs: initialize location to fix -Wmaybe-uninitialized in btrfs_lookup_dentry() Date: Tue, 10 Sep 2024 11:34:02 +0200 Message-ID: <20240910092600.655505758@linuxfoundation.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910092554.645718780@linuxfoundation.org> References: <20240910092554.645718780@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: David Sterba [ Upstream commit b8e947e9f64cac9df85a07672b658df5b2bcff07 ] Some arch + compiler combinations report a potentially unused variable location in btrfs_lookup_dentry(). This is a false alert as the variable is passed by value and always valid or there's an error. The compilers cannot probably reason about that although btrfs_inode_by_name() is in the same file. > + /kisskb/src/fs/btrfs/inode.c: error: 'location.objectid' may be used +uninitialized in this function [-Werror=maybe-uninitialized]: => 5603:9 > + /kisskb/src/fs/btrfs/inode.c: error: 'location.type' may be used +uninitialized in this function [-Werror=maybe-uninitialized]: => 5674:5 m68k-gcc8/m68k-allmodconfig mips-gcc8/mips-allmodconfig powerpc-gcc5/powerpc-all{mod,yes}config powerpc-gcc5/ppc64_defconfig Initialize it to zero, this should fix the warnings and won't change the behaviour as btrfs_inode_by_name() accepts only a root or inode item types, otherwise returns an error. Reported-by: Geert Uytterhoeven Tested-by: Geert Uytterhoeven Link: https://lore.kernel.org/linux-btrfs/bd4e9928-17b3-9257-8ba7-6b7f9bbb639a@linux-m68k.org/ Reviewed-by: Qu Wenruo Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 4bf28f74605f..cd3156a9a268 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -5527,7 +5527,7 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) struct inode *inode; struct btrfs_root *root = BTRFS_I(dir)->root; struct btrfs_root *sub_root = root; - struct btrfs_key location; + struct btrfs_key location = { 0 }; u8 di_type = 0; int ret = 0; -- 2.43.0