Re: [BUG] perf tools: Build failure in v6.16-rc1

[Arnaldo Carvalho de Melo <acme@kernel.org>]

On Wed, Jun 11, 2025 at 11:25:42AM +0200, Sebastian Andrzej Siewior wrote:
> On 2025-06-10 11:34:44 [-0700], Namhyung Kim wrote:
> > Hello,
> Hi,
> 
> > I've updated the perf-tools-next to v6.16-rc1 and found a build error
> > like below on alpine linux 3.18.
> > 
> >   In file included from bench/futex.c:6:
> >   /usr/include/sys/prctl.h:88:8: error: redefinition of 'struct prctl_mm_map'
> >      88 | struct prctl_mm_map {
> >         |        ^~~~~~~~~~~~
> >   In file included from bench/futex.c:5:
> >   /linux/tools/include/uapi/linux/prctl.h:134:8: note: originally defined here
> >     134 | struct prctl_mm_map {
> >         |        ^~~~~~~~~~~~
> >   make[4]: *** [/linux/tools/build/Makefile.build:86: /build/bench/futex.o] Error 1
> > 
> > git bisect says it's the first commit introduced the failure.
> 
> Hmm. So your /usr/include/sys/prctl.h and
> /linux/tools/include/uapi/linux/prctl.h both provide struct
> prctl_mm_map but their include guard must be different.
> 
> My /usr/include/sys/prctl.h is provided by glibc and contains the
> prctl() declaration. It includes also linux/prctl.h.
> The tools/include/uapi/linux/prctl.h is the same as
> /usr/include/linux/prctl.h.
> 
> The /usr/include/sys/prctl.h on alpine linux is different. This is
> probably coming from musl. It contains the PR_* definition and the
> prctl() declaration. So it clashes here because now the one struct is
> available twice.
> 
> The man page for prctl(2) says:
> |       #include <linux/prctl.h>  /* Definition of PR_* constants */
> |       #include <sys/prctl.h>
> 
> so musl doesn't follow this.
> 
> To align with the other builds, I guess the following help:

So I noticed this as well in perf-tools/perf-tools, I'm trying with your
patch applied, lets see...

- Arnaldo
 
> diff --git a/tools/perf/bench/futex.c b/tools/perf/bench/futex.c
> index 26382e4d8d4ce..540261f299b1d 100644
> --- a/tools/perf/bench/futex.c
> +++ b/tools/perf/bench/futex.c
> @@ -2,7 +2,6 @@
>  #include <err.h>
>  #include <stdio.h>
>  #include <stdlib.h>
> -#include <linux/prctl.h>
>  #include <sys/prctl.h>
>  
>  #include "futex.h"
> 
> Sebastian