netdev - Re: [PATCH] iproute2: fix build failure on ppc64le

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Date: Wed, 14 Feb 2024 20:10:54 -0700
From: David Ahern <dsahern@...il.com>
To: Stephen Hemminger <stephen@...workplumber.org>
Cc: Andrea Claudi <aclaudi@...hat.com>, netdev@...r.kernel.org,
 sgallagh@...hat.com
Subject: Re: [PATCH] iproute2: fix build failure on ppc64le

On 2/14/24 8:05 PM, Stephen Hemminger wrote:
> 
> I just did this:
> 
> diff --git a/misc/ss.c b/misc/ss.c
> index 5296cabe9982..679d50b8fef6 100644
> --- a/misc/ss.c
> +++ b/misc/ss.c
> @@ -8,6 +8,7 @@
>  #include <stdio.h>
>  #include <stdlib.h>
>  #include <unistd.h>
> +#include <inttypes.h>
>  #include <fcntl.h>
>  #include <sys/ioctl.h>
>  #include <sys/socket.h>
> @@ -3241,7 +3242,7 @@ static void mptcp_stats_print(struct mptcp_info *s)
>         if (s->mptcpi_snd_una)
>                 out(" snd_una:%llu", s->mptcpi_snd_una);
>         if (s->mptcpi_rcv_nxt)
> -               out(" rcv_nxt:%llu", s->mptcpi_rcv_nxt);
> +               out(" rcv_nxt:%" PRIu64, s->mptcpi_rcv_nxt);
>         if (s->mptcpi_local_addr_used)
>                 out(" local_addr_used:%u", s->mptcpi_local_addr_used);
>         if (s->mptcpi_local_addr_max)
> 
> 
> And got this:
>     CC       ss.o
> ss.c: In function ‘mptcp_stats_print’:
> ss.c:3245:21: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘__u64’ {aka ‘long long unsigned int’} [-Wformat=]
>  3245 |                 out(" rcv_nxt:%" PRIu64, s->mptcpi_rcv_nxt);
>       |                     ^~~~~~~~~~~~         ~~~~~~~~~~~~~~~~~
>       |                                           |
>       |                                           __u64 {aka long long unsigned int}
> In file included from ss.c:11:
> /usr/include/inttypes.h:105:41: note: format string is defined here
>   105 | # define PRIu64         __PRI64_PREFIX "u"
> 

Andrea: can you check on how perf (kernel utils) compiles on ppc64le? I
thought Arnaldo had build "farms" for all of the architectures; maybe
not for this one. __u64 is used a lot in the perf_events UAPI and PRIu64
is used extensively in the userspace code.