linux-kernel - Re: [PATCH] nilfs2: Use div64_ul() instead of do

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Message-Id: <215C3176-D6E5-47CF-BC48-7A75CF75CE3F@toblux.com>
Date: Thu, 29 Feb 2024 22:14:48 +0100
From: Thorsten Blum <thorsten.blum@...lux.com>
To: Ryusuke Konishi <konishi.ryusuke@...il.com>
Cc: linux-nilfs@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nilfs2: Use div64_ul() instead of do_div()


> On Feb 29, 2024, at 21:40, Thorsten Blum <thorsten.blum@...lux.com> wrote:
> 
>> On Feb 29, 2024, at 20:41, Thorsten Blum <thorsten.blum@...lux.com> wrote:
>> 
>>> On Feb 29, 2024, at 19:45, Ryusuke Konishi <konishi.ryusuke@...il.com> wrote:
>>> 
>>> All of the fixes in this patch seem to be correct, but this doesn't
>>> cover nilfs_resize_fs(), nilfs_max_segment_count(), and
>>> nilfs_sb2_bad_offset(), which also have do_div() that doesn't use the
>>> return value.
>> 
>> For nilfs_sb2_bad_offset(), where the dividend is u64 and the divisor is u32, we
>> would need a dedicated function like div64_u32() that doesn't calculate the
>> remainder, which doesn't seem to exist. What do you think?
> 
> Never mind, there is div_u64(u64, u32). I'll submit a v2 shortly.

I left nilfs_sb2_bad_offset() unchanged in v2 because div_u64() still calculates
the remainder.

Thorsten