linux-kernel - Re: [PATCH 1/3] kbuild: add -fno-PIE

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Date:   Wed, 9 Nov 2016 07:10:42 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Michal Marek <mmarek@...e.com>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        x86@...nel.org, Al Viro <viro@...IV.linux.org.uk>,
        Ben Hutchings <ben@...adent.org.uk>,
        Sven Joachim <svenjoac@....de>,
        "Austin S. Hemmelgarn" <ahferroin7@...il.com>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 1/3] kbuild: add -fno-PIE


* Michal Marek <mmarek@...e.com> wrote:

> On Fri, Nov 04, 2016 at 07:39:38PM +0100, Sebastian Andrzej Siewior wrote:
> > Debian started to build the gcc with -fPIE by default so the kernel
> > build ends before it starts properly with:
> > |kernel/bounds.c:1:0: error: code model kernel does not support PIC mode
> > 
> > Also add to KBUILD_AFLAGS due to:
> > 
> > |gcc -Wp,-MD,arch/x86/entry/vdso/vdso32/.note.o.d … -mfentry -DCC_USING_FENTRY … vdso/vdso32/note.S
> > |arch/x86/entry/vdso/vdso32/note.S:1:0: sorry, unimplemented: -mfentry isn’t supported for 32-bit in combination with -fpic
> > 
> > Tagging it stable so it is possible to compile recent stable kernels as
> > well.
> > 
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> > ---
> >  Makefile | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/Makefile b/Makefile
> > index a2650f9c6a25..d61145ebf498 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -622,6 +622,8 @@ include arch/$(SRCARCH)/Makefile
> >  KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
> >  KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
> >  KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
> > +KBUILD_CFLAGS	+= $(call cc-option,-fno-PIE)
> > +KBUILD_AFLAGS	+= $(call cc-option,-fno-PIE)
> 
> Bad compiler. No pie for you.
> 
> I applied this one to kbuild.git. How about 2/3 and 3/3. Will these be
> merged via tip.git or shall I apply them as well?

I'd suggest applying them to the kbuild tree, as they are related.

Thanks,

	Ingo