linux-kernel - Re: [PATCH] tools/power turbostat: Fix build with musl

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Message-ID: <aE-T0cZsdoCZOD_Y@mozart.vkv.me>
Date: Sun, 15 Jun 2025 20:47:29 -0700
From: Calvin Owens <calvin@...nvd.org>
To: "Zhang, Rui" <rui.zhang@...el.com>
Cc: "dedekind1@...il.com" <dedekind1@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"lenb@...nel.org" <lenb@...nel.org>
Subject: Re: [PATCH] tools/power turbostat: Fix build with musl

On Monday 06/16 at 01:31 +0000, Zhang, Rui wrote:
> On Fri, 2025-06-13 at 20:45 +0300, Artem Bityutskiy wrote:
> > On Fri, 2025-06-13 at 09:54 -0700, Calvin Owens wrote:
> > >     turbostat.c: In function 'parse_int_file':
> > >     turbostat.c:5567:19: error: 'PATH_MAX' undeclared (first use in
> > > this function)
> > >      5567 |         char path[PATH_MAX];
> > >           |                   ^~~~~~~~
> > > 
> > >     turbostat.c: In function 'probe_graphics':
> > >     turbostat.c:6787:19: error: 'PATH_MAX' undeclared (first use in
> > > this function)
> > >      6787 |         char path[PATH_MAX];
> > >           |                   ^~~~~~~~
> > > 
> > > Signed-off-by: Calvin Owens <calvin@...nvd.org>
> > Reviewed-by: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
> > 
> May I know how to reproduce this?

Hi Rui,

Just build turbostat with musl as libc, here's a quick chroot repro that
works on my Debian laptop:

    wget https://gentoo.osuosl.org/releases/amd64/autobuilds/current-stage3-amd64-musl/stage3-amd64-musl-20250601T163943Z.tar.xz
    mkdir tmp
    sudo tar xf stage3-amd64-musl-20250601T163943Z.tar.xz -C ./tmp
    wget https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.15.2.tar.xz
    sudo mv linux-6.15.2.tar.xz tmp
    sudo chroot tmp /bin/bash
    gentoo / # tar xf linux-6.15.2.tar.xz
    gentoo / # cd linux-6.15.2/tools/power/x86/turbostat/
    gentoo /linux-6.15.2/tools/power/x86/turbostat # make
    gcc -O2 -Wall -Wextra -I../../../include -DMSRHEADER='"../../../../arch/x86/include/asm/msr-index.h"' -DINTEL_FAMILY_HEADER='"../../../../arch/x86/include/asm/intel-family.h"' -DBUILD_BUG_HEADER='"../../../../include/linux/build_bug.h"' -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2 turbostat.c -o /root/linux-6.15.2/tools/power/x86/turbostat/turbostat  -lcap -lrt
    turbostat.c: In function 'parse_int_file':
    turbostat.c:5567:19: error: 'PATH_MAX' undeclared (first use in this function)
     5567 |         char path[PATH_MAX];
          |                   ^~~~~~~~
    turbostat.c:5567:19: note: each undeclared identifier is reported only once for each function it appears in
    turbostat.c:5567:14: warning: unused variable 'path' [-Wunused-variable]
     5567 |         char path[PATH_MAX];
          |              ^~~~
    turbostat.c: In function 'probe_graphics':
    turbostat.c:6787:19: error: 'PATH_MAX' undeclared (first use in this function)
     6787 |         char path[PATH_MAX];
          |                   ^~~~~~~~
    turbostat.c:6787:14: warning: unused variable 'path' [-Wunused-variable]
     6787 |         char path[PATH_MAX];
          |              ^~~~
    make: *** [Makefile:23: turbostat] Error 1

Thanks,
Calvin