linux-kernel - Re: [PATCH] ptp: drop redundant kasprintf() to create worker name

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Date:   Sat, 27 Oct 2018 06:04:45 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Kees Cook <keescook@...omium.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ptp: drop redundant kasprintf() to create worker name

On Fri, Oct 26, 2018 at 11:22:59PM +0200, Rasmus Villemoes wrote:
> Building with -Wformat-nonliteral, gcc complains
> 
> drivers/ptp/ptp_clock.c: In function ‘ptp_clock_register’:
> drivers/ptp/ptp_clock.c:239:26: warning: format not a string literal and no format arguments [-Wformat-nonliteral]
>             worker_name : info->name);
> 
> kthread_create_worker takes fmt+varargs to set the name of the
> worker, and that happens with a vsnprintf() to a stack buffer (that is
> then copied into task_comm). So there's no reason not to just pass
> "ptp%d", ptp->index to kthread_create_worker() and avoid the
> intermediate worker_name variable.

Acked-by: Richard Cochran <richardcochran@...il.com>