linux-kernel - Re: [PATCH] arm: Build with -fno-dwarf2-cfi-asm

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Message-ID: <20100726131122.GD23399@n2100.arm.linux.org.uk>
Date:	Mon, 26 Jul 2010 14:11:22 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Michal Marek <mmarek@...e.cz>
Cc:	Mikael Pettersson <mikpe@...uu.se>,
	Robert Nelson <robertcnelson@...il.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm: Build with -fno-dwarf2-cfi-asm

On Mon, Jul 26, 2010 at 03:04:18PM +0200, Michal Marek wrote:
> On 10.7.2010 15:02, Mikael Pettersson wrote:
> > Michal Marek writes:
> >  > Commit d0679c7 restricted this workaround to powerpc only, but it turns
> >  > out that ARM needs it as well. Fixes
> >  > https://bugzilla.kernel.org/show_bug.cgi?id=16310 .
> >  > 
> >  > Reported-and-Tested-by: Robert Nelson <robertcnelson@...il.com>
> >  > Signed-off-by: Michal Marek <mmarek@...e.cz>
> >  > ---
> >  >  arch/arm/Makefile |    5 +++++
> >  >  1 files changed, 5 insertions(+), 0 deletions(-)
> >  > 
> >  > diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> >  > index 64ba313..862d4ba 100644
> >  > --- a/arch/arm/Makefile
> >  > +++ b/arch/arm/Makefile
> >  > @@ -21,6 +21,11 @@ GZFLAGS		:=-9
> >  >  # Explicitly specifiy 32-bit ARM ISA since toolchain default can be -mthumb:
> >  >  KBUILD_CFLAGS	+=$(call cc-option,-marm,)
> >  >  
> >  > +# FIXME: the module load should be taught about the additional relocs
> >  > +# generated by this.
> >  > +# revert to pre-gcc-4.4 behaviour of .eh_frame
> >  > +KBUILD_CFLAGS	+= $(call cc-option,-fno-dwarf2-cfi-asm)
> > 
> > Appears related to gcc PR40521, which should be fixed in gcc-4.4.3,
> > though it may have been re-broken in gcc-4.5.0 for in a corner case
> > <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40521#c24> that may or
> > may not apply to the kernel.  There's also a related binutils issue.
> > 
> > The above fix seems appropriate, but the FIXME comment seems wrong:
> > this is about getting the right kind of exception unwind tables in
> > the entire kernel, not just relocs in modules.
> > 
> > The comment should just say:
> > # Never generate .eh_frame:
> > 
> > So for the fix without the comment part:
> > 
> > Acked-by: Mikael Pettersson <mikpe@...uu.se>
> 
> Hi Russell,
> 
> should I resend the patch with the comment by Mikael?

Yes please - and please put it in the patch system.
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