Re: [main-line]Build warnings on PowerPC system

[Christophe Leroy]

Le 27/03/2025 à 17:24, Venkat Rao Bagalkote a écrit :
> On 27/03/25 8:36 pm, Madhavan Srinivasan wrote:
> > On 3/27/25 7:31 PM, Venkat Rao Bagalkote wrote:
> > > On 27/03/25 7:22 pm, Madhavan Srinivasan wrote:
> > > > On 3/27/25 12:33 AM, Venkat Rao Bagalkote wrote:
> > > > > Greetings!!!
> > > > >
> > > > > I see below build warnings while compiling mainline kernel on IBM 
> > > > > Power9 system.
> > > > >
> > > > > Repo Link: https://eur01.safelinks.protection.outlook.com/? 
> > > > > url=https%3A%2F%2Fgit.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git%2F&data=05%7C02%7Cchristophe.leroy2%40cs-soprasteria.com%7Cd6121f3814a7497bc5e608dd6d4be6c8%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638786894952762400%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=3el3Uw9JR2vxDzjOIvF%2BVnienBrwtOsA%2Ftg0kGBqziE%3D&reserved=0
> > > > >
> > > > > Head Commit: f6e0150b2003fb2b9265028a618aa1732b3edc8f
> > > > >
> > > > > Attached is the .config.
> > > > >
> > > > > Machine: IBM Power9
> > > > >
> > > > > gcc version 11.5.0
> > > > What is the ld version in your system.
> > > Please find the ld version below.
> > >
> > > GNU ld version 2.35.2-59.el9
> >
> > ah ok that explains. Kindly can you try with this patch and let us 
> > know whether
> > this fixes the warning in your setup
> >
> >
> > diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
> > index 1db60fe13802..09ceb5a42d81 100755
> > --- a/arch/powerpc/boot/wrapper
> > +++ b/arch/powerpc/boot/wrapper
> > @@ -235,7 +235,7 @@ fi
> >   # suppress some warnings in recent ld versions
> >   nowarn="-z noexecstack"
> >   if ! ld_is_lld; then
> > -       if [ "$LD_VERSION" -ge "$(echo 2.39 | ld_version)" ]; then
> > +       if [ "$LD_VERSION" -ge "$(echo 2.35 | ld_version)" ]; then
> >                  nowarn="$nowarn --no-warn-rwx-segments"
> >          fi
> >   fi
> Above change fixes the issue. No warnings observed. Thank you!!

Take care, this must be a special version of binutils.

With regular 2.36.1 I get following error:

$ /opt/gcc/gcc-8.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
GNU ld (GNU Binutils) 2.36.1
Copyright (C) 2021 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later 
version.
This program has absolutely no warranty.

$ /opt/gcc/gcc-8.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld 
--no-warn-rwx-segments test.o
/opt/gcc/gcc-8.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld: 
unrecognized option '--no-warn-rwx-segments'
/opt/gcc/gcc-8.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld: use 
the --help option for usage information