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 EA7522F2B; Wed, 1 Feb 2023 16:40:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 092EBC433EF; Wed, 1 Feb 2023 16:40:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1675269654; bh=KSq1dYBd01CzJMTzCKqs3/YS7g3At35mPs1z5Nkv6oc=; h=From:Date:Subject:To:Cc:From; b=pLn5/92olQ9nSSmkCMuwj0xDGN1IQyrCHURuiCr6Yvz7DZZ1xzj0xwncGpVapYgKQ x4UvvH4nl69IDx71CiE4rchBSe1rgHO7f9apalpCeBREUYDCz5ElsKhCTxmdqgeWZb HW3kqmUR7ema+E5KwMX9p8Qw1Wt9kTg+3tJ54GAdsVBSliJTPlexPoHFX6Pqs9vHNt FuWxniMl4FOnxoOb63OEjHbv+Hy4djOvVAgfbC4PE9ZSstEA/uplUO9Uw69qKeOtjv eD10TIBYkwn0+/8XsYM8lWlorSD3E6DFhdMAVsb1GF5LWCWnkOCnMzd0JPjaGuvswv cEBdt5pe/n7VA== From: Nathan Chancellor Date: Wed, 01 Feb 2023 09:40:22 -0700 Subject: [PATCH] f2fs: Fix type of single bit bitfield in f2fs_io_info Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20230201-f2fs-fix-single-length-bitfields-v1-1-e386f7916b94@kernel.org> X-B4-Tracking: v=1; b=H4sIAPWV2mMC/x3NywoCMQyF4VcZsjbQqQuLryIueknbQK2SFBkY5 t3tuPw58J0dlIRJ4b7sIPRl5XefsV4WiNX3QshpNlhjr8aaFbPNipk3VO6lETbqZVQMPDJTS4o puxhvjpwzHiYTvBIG8T3WE3p5HSTn8BGazv/78TyOHxPv+SWLAAAA To: jaegeuk@kernel.org, chao@kernel.org Cc: ndesaulniers@google.com, trix@redhat.com, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, patches@lists.linux.dev, kernel test robot , Nathan Chancellor X-Mailer: b4 0.12.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=2740; i=nathan@kernel.org; h=from:subject:message-id; bh=KSq1dYBd01CzJMTzCKqs3/YS7g3At35mPs1z5Nkv6oc=; b=owGbwMvMwCEmm602sfCA1DTG02pJDMm3ponK+HZaB8susOx5+HD3Be2z2eVxq2sn7JBWWu25+ rurt5dkRykLgxgHg6yYIkv1Y9XjhoZzzjLeODUJZg4rE8gQBi5OAZjI9mWMDPfVpHOfPMr9qxNd +XXlDeYXhpfDFJcrCvdG5SS3y3AxcjH8Zu25G351up/Ea2X55u0n3/jZu72XDg3IWCFu69pUIRL ADgA= X-Developer-Key: i=nathan@kernel.org; a=openpgp; fpr=2437CB76E544CB6AB3D9DFD399739260CB6CB716 Clang warns: ../fs/f2fs/data.c:995:17: error: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Werror,-Wsingle-bit-bitfield-constant-conversion] fio->submitted = 1; ^ ~ ../fs/f2fs/data.c:1011:15: error: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Werror,-Wsingle-bit-bitfield-constant-conversion] fio->retry = 1; ^ ~ ../fs/f2fs/segment.c:3320:16: error: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Werror,-Wsingle-bit-bitfield-constant-conversion] fio->in_list = 1; ^ ~ There is not a bug here because the value of these fields is never explicitly compared against (just whether it is zero or non-zero) but it is easy to silence the warning by using an unsigned type to allow an assignment of 0 or 1 without implicit conversion. Fixes: 998863dadd2c ("f2fs: reduce stack memory cost by using bitfield in struct f2fs_io_info") Link: https://github.com/ClangBuiltLinux/linux/issues/1796 Reported-by: kernel test robot Signed-off-by: Nathan Chancellor --- fs/f2fs/f2fs.h | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 08dc64c5050e..89f6fdfeed19 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -1213,12 +1213,12 @@ struct f2fs_io_info { int compr_blocks; /* # of compressed block addresses */ int need_lock:8; /* indicate we need to lock cp_rwsem */ int version:8; /* version of the node */ - int submitted:1; /* indicate IO submission */ - int in_list:1; /* indicate fio is in io_list */ - int is_por:1; /* indicate IO is from recovery or not */ - int retry:1; /* need to reallocate block address */ - int encrypted:1; /* indicate file is encrypted */ - int post_read:1; /* require post read */ + unsigned int submitted:1; /* indicate IO submission */ + unsigned int in_list:1; /* indicate fio is in io_list */ + unsigned int is_por:1; /* indicate IO is from recovery or not */ + unsigned int retry:1; /* need to reallocate block address */ + unsigned int encrypted:1; /* indicate file is encrypted */ + unsigned int post_read:1; /* require post read */ enum iostat_type io_type; /* io type */ struct writeback_control *io_wbc; /* writeback control */ struct bio **bio; /* bio for ipu */ --- base-commit: de6b3a5e09b29c014bd04044b023896107cfa2ee change-id: 20230201-f2fs-fix-single-length-bitfields-df8cc78e880a Best regards, -- Nathan Chancellor