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 7EB883A4F2A; Tue, 10 Mar 2026 17:28:26 +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=1773163706; cv=none; b=BZanBGUXxMM7QreyTKjVyeo5mXcR2rCoioCOJyBb6bPDEAaX6SgtWlr7cc5j54oG5ISuLTH/qlrKpKgZC3kohPMATivzDuV0LFaQuHdo7ylyn/rhzwUR8ys2B4Xy0ahGOtcMZYtcU8Qp3p8lgGR2x6ECjKwLIqt1uaDaI3QVgk8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773163706; c=relaxed/simple; bh=q/MA2EPx5lJgB6HZP9ewlQVZn3z96gyXREivMza9azM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=SeMX47tsql5Rhcg2EqNmXV0+wKmAR29whyFfzAy1d77PMMCNFfAonO6MmqrXN2MIsKMD8Fn8uV1tV89wDwxBaU+STPzzmgUe1XrbSvlx0Ho3aER+Hd8hUZuef0dY4OUHVhZyrBi6pThRPK8vueaXRF0kDqf9iGUCnpBE+GMnlVQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LgOBuB78; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LgOBuB78" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ABF50C19423; Tue, 10 Mar 2026 17:28:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773163706; bh=q/MA2EPx5lJgB6HZP9ewlQVZn3z96gyXREivMza9azM=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=LgOBuB78xavER0ssRCZu/MI9N/npwSRacODBIw3BRijWcYu6KKRFpt4g+9TiGI/7g WzY8FYaqzXWwjzbLMUhOJUaCdIZLLaP5Xtw4vmlpOkk0MUK68yyr8nAL4FgMS4InCJ hyA2PZEgFaZ+gxyA44UIS3TCjQoamSt1YmHSESOigymTkNrK7niQUTFwxPyAfqhYmd nFd5Q/D0Tgm+bFv407u3eJ/712XRevA+VkrDQz/F8C3DyF0D4+bHziEFdwSNmg9Lpv 5P82t9YQ4s0j2fDObgSX+GgYVJfGL+VycqA5lGS6oVk+tpLNJSzXZNTX3dI1ZvCMhQ PYstmOL6l3niQ== Message-ID: <78190c229db1d61cd45caf0f55d0f8d4fb1e8787.camel@kernel.org> Subject: Re: [PATCH 1/2] nilfs2: fix 64-bit division operations in nilfs_bmap_find_target_in_group() From: Jeff Layton To: Viacheslav Dubeyko , Christian Brauner , Ryusuke Konishi , Mimi Zohar , Roberto Sassu , Dmitry Kasatkin , Eric Snowberg , Paul Moore , James Morris , "Serge E. Hallyn" Cc: linux-nilfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, kernel test robot Date: Tue, 10 Mar 2026 13:28:22 -0400 In-Reply-To: References: <20260310-iino-u64-v1-0-18422a053b04@kernel.org> <20260310-iino-u64-v1-1-18422a053b04@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ 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CHqumUHRry+RF0lH00clzX/W8OrQJZtoBPXv9ahka/Vp7kEulcBJr1cH5Wz/WprhsIM7U9pse1f1g Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.3 (3.58.3-1.fc43) Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-03-10 at 09:54 -0700, Viacheslav Dubeyko wrote: > On Tue, 2026-03-10 at 07:43 -0400, Jeff Layton wrote: > > With the change to make inode->i_ino a u64, the build started failing > > on > > 32-bit ARM with: > >=20 > > =C2=A0=C2=A0=C2=A0 ERROR: modpost: "__aeabi_uldivmod" [fs/nilfs2/nilfs2= .ko] > > undefined! > >=20 > > Fix this by using the 64-bit division interfaces in > > nilfs_bmap_find_target_in_group(). > >=20 > > Fixes: 998a59d371c2 ("treewide: fix missed i_ino format specifier > > conversions") > > Reported-by: kernel test robot > > Closes: > > https://lore.kernel.org/oe-kbuild-all/202603100602.KPxiClIO-lkp@intel.c= om/ > > Signed-off-by: Jeff Layton > > --- > > =C2=A0fs/nilfs2/bmap.c | 9 ++++++--- > > =C2=A01 file changed, 6 insertions(+), 3 deletions(-) > >=20 > > diff --git a/fs/nilfs2/bmap.c b/fs/nilfs2/bmap.c > > index > > 824f2bd91c167965ec3a660202b6e6c5f1fe007e..4ce9a93149a5af13bc215cc1877 > > a757e2c6cf49b 100644 > > --- a/fs/nilfs2/bmap.c > > +++ b/fs/nilfs2/bmap.c > > @@ -455,11 +455,14 @@ __u64 nilfs_bmap_find_target_in_group(const > > struct nilfs_bmap *bmap) > > =C2=A0{ > > =C2=A0 struct inode *dat =3D nilfs_bmap_get_dat(bmap); > > =C2=A0 unsigned long entries_per_group =3D > > nilfs_palloc_entries_per_group(dat); > > - unsigned long group =3D bmap->b_inode->i_ino / > > entries_per_group; > > + unsigned long group; > > + u32 rem; > > + > > + group =3D div_u64(bmap->b_inode->i_ino, entries_per_group); > > + div_u64_rem(bmap->b_inode->i_ino, NILFS_BMAP_GROUP_DIV, > > &rem); > > =C2=A0 > > =C2=A0 return group * entries_per_group + > > - (bmap->b_inode->i_ino % NILFS_BMAP_GROUP_DIV) * > > - (entries_per_group / NILFS_BMAP_GROUP_DIV); > > + =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 rem * (entries_per_group / NILFS= _BMAP_GROUP_DIV); > > =C2=A0} > > =C2=A0 > > =C2=A0static struct lock_class_key nilfs_bmap_dat_lock_key; >=20 > Makes sense. :) Maybe, rem is not very good variable name, but the > whole logic looks good. >=20 > Reviewed-by: Viacheslav Dubeyko >=20 Thanks. My thinking was "remainder" but I don't have an objection if you guys want to change it. --=20 Jeff Layton