On Thu, Feb 28, 2019 at 11:36:52AM +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):
>
> net/sctp/chunk.c:196:25: warning: data argument not used by format string [-Wformat-extra-args]
> __func__, asoc, max_data);
> ~~~~~~~~~~~~~~~~^~~~~~~~~
> ./include/linux/printk.h:440:49: note: expanded from macro 'pr_warn_ratelimited'
> printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
> ./include/linux/printk.h:424:17: note: expanded from macro 'printk_ratelimited'
> printk(fmt, ##__VA_ARGS__); \
> ~~~ ^
>
> Fixes: 5b5e0928f742 ("lib/vsprintf.c: remove %Z support")
> Link: https://github.com/ClangBuiltLinux/linux/issues/378
> Signed-off-by: Matthias Maennich <maennich@xxxxxxxxxx>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
> ---
> net/sctp/chunk.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
> index 64bef313d436..5cb7c1ff97e9 100644
> --- 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);
> }
>
> --
> 2.21.0.rc2.261.ga7da99ff1b-goog
>
