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

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Date:	Mon, 26 Jul 2010 15:04:18 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Russell King <linux@....linux.org.uk>
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 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?

Thanks,
Michal
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