netdev - Re: [PATCH] sctp: chunk.c: correct format string for size

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Date:   Fri, 01 Mar 2019 14:22:30 -0800
From:   Joe Perches <joe@...ches.com>
To:     Matthias Maennich <maennich@...gle.com>
Cc:     Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sctp: chunk.c: correct format string for size_t in
 printk

On Thu, 2019-02-28 at 11:36 +0000, Matthias Maennich wrote:
> According to Documentation/core-api/printk-formats.rst, size_t should be
> printed with %zu, rather than %Zu.
> 
> In addition, using %Zu triggers a warning on clang (-Wformat-extra-args):
[]
> diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
[]
> @@ -192,7 +192,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
>  	if (unlikely(!max_data)) {
>  		max_data = sctp_min_frag_point(sctp_sk(asoc->base.sk),
>  					       sctp_datachk_len(&asoc->stream));
> -		pr_warn_ratelimited("%s: asoc:%p frag_point is zero, forcing max_data to default minimum (%Zu)",
> +		pr_warn_ratelimited("%s: asoc:%p frag_point is zero, forcing max_data to default minimum (%zu)",
>  				    __func__, asoc, max_data);

trivia: the format is also missing a terminating '\n'