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

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Date: Fri, 9 Feb 2024 16:45:42 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: David Ahern <dsahern@...il.com>
Cc: Andrea Claudi <aclaudi@...hat.com>, netdev@...r.kernel.org,
 sgallagh@...hat.com
Subject: Re: [PATCH] iproute2: fix build failure on ppc64le

On Fri, 9 Feb 2024 15:14:28 -0700
David Ahern <dsahern@...il.com> wrote:

> On 2/9/24 9:35 AM, Stephen Hemminger wrote:
> > On Fri,  9 Feb 2024 11:24:47 +0100
> > Andrea Claudi <aclaudi@...hat.com> wrote:
> >   
> >> ss.c:3244:34: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 2 has type ‘__u64’ {aka ‘long unsigned int’} [-Wformat=]
> >>  3244 |                 out(" rcv_nxt:%llu", s->mptcpi_rcv_nxt);
> >>       |                               ~~~^   ~~~~~~~~~~~~~~~~~
> >>       |                                  |    |
> >>       |                                  |    __u64 {aka long unsigned int}
> >>       |                                  long long unsigned int
> >>       |                               %lu
> >>
> >> This happens because __u64 is defined as long unsigned on ppc64le.  As
> >> pointed out by Florian Weimar, we should use -D__SANE_USERSPACE_TYPES__
> >> if we really want to use long long unsigned in iproute2.  
> > 
> > Ok, this looks good.
> > Another way to fix would be to use the macros defined in inttypes.h
> > 
> > 		out(" rcv_nxt:"PRIu64, s->mptcpi_rcv_nxt);
> >   
> 
> since the uapi is __u64, I think this is the better approach.

NVM
Tried it, but __u64 is not the same as uint64_t even on x86.
__u64 is long long unsigned int
uint64_t is long unsigned int