linux-kernel - Re: [PATCH] nfp: remove h from printk format specifier

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Message-ID: <65755252-96c3-a808-3e01-e377dd395ee7@redhat.com>
Date:   Fri, 25 Dec 2020 14:13:06 -0800
From:   Tom Rix <trix@...hat.com>
To:     Joe Perches <joe@...ches.com>,
        Simon Horman <simon.horman@...ronome.com>
Cc:     kuba@...nel.org, davem@...emloft.net, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, gustavoars@...nel.org,
        louis.peens@...ronome.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org, oss-drivers@...ronome.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nfp: remove h from printk format specifier


On 12/25/20 9:06 AM, Joe Perches wrote:
> On Fri, 2020-12-25 at 06:56 -0800, Tom Rix wrote:
>> On 12/24/20 2:39 PM, Joe Perches wrote:
> []
>>> Kernel code doesn't use a signed char or short with %hx or %hu very often
>>> but in case you didn't already know, any signed char/short emitted with
>>> anything like %hx or %hu needs to be left alone as sign extension occurs so:
>> Yes, this would also effect checkpatch.
> Of course but checkpatch is stupid and doesn't know types
> so it just assumes that the type argument is not signed.
>
> In general, that's a reasonable but imperfect assumption.
>
> coccinelle could probably do this properly as it's a much
> better parser.  clang-tidy should be able to as well.
>
Ok.

But types not matching the format string is a larger problem.

Has there been an effort to clean these up ?

Tom