linux-kernel - Re: [PATCH] fs/9p: Fix a datatype used with V9FS_DIRECT

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Date:   Tue, 25 Apr 2023 16:08:39 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Eric Van Hensbergen <ericvh@...nel.org>,
        Latchesar Ionkov <lucho@...kov.net>,
        Christian Schoenebeck <linux_oss@...debyte.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        v9fs@...ts.linux.dev
Subject: Re: [PATCH] fs/9p: Fix a datatype used with V9FS_DIRECT_IO

Christophe JAILLET wrote on Tue, Apr 25, 2023 at 08:47:27AM +0200:
> The commit in Fixes has introduced some "enum p9_session_flags" values
> larger than a char.
> Such values are stored in "v9fs_session_info->flags" which is a char only.
> 
> Turn it into an int so that the "enum p9_session_flags" values can fit in
> it.

Good catch, thanks!

I'm surprised W=1 doesn't catch this... and now I'm checking higher
(noisy) W=, or even clang doesn't seem to print anything about e.g.
'v9ses->flags & V9FS_DIRECT_IO is never true' or other warnings I'd have
expected to come up -- out of curiosity how did you find this?

Would probably be interesting to run some form of the same in our
automation.

> Fixes: 6deffc8924b5 ("fs/9p: Add new mount modes")

(Not a problem per se: but note this commit hasn't been merged yet, so
using commit IDs is a bit dangerous. Might want to remark this in the
free comment section so Eric pays attention to not break that when applying)

> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Reviewed-by: Dominique Martinet <asmadeus@...ewreck.org>

-- 
Dominique