linux-kernel - Re: [PATCH v2 0/2] fs: clear a UBSAN shift-out-of-bounds warning

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Message-ID: <Y4BkJd3Jy6MY3cdu@ZenIV>
Date:   Fri, 25 Nov 2022 06:43:49 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Zhen Lei <thunder.leizhen@...wei.com>
Cc:     Eric Biggers <ebiggers@...nel.org>, linux-fsdevel@...r.kernel.org,
        Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/2] fs: clear a UBSAN shift-out-of-bounds warning

On Mon, Nov 21, 2022 at 10:44:16AM +0800, Zhen Lei wrote:
> v1 -- > v2:
> 1. Replace INT_LIMIT(loff_t) with OFFSET_MAX in btrfs.
> 2. Replace INT_LIMIT() with type_max().

Looks fine, except that I'd rather go for commit message
along the lines of "INT_LIMIT tries to do what type_max does,
except that type_max doesn't rely upon undefined behaviour;
might as well use type_max() instead"

If you want to credit UBSAN - sure, no problem, just don't
clutter the commit message with that.  As it is, it reads
as "make $TOOL STFU"...