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SubjectRe: [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@gmail.com>
> > Signed-off-by: Michal Marek <mmarek@suse.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@it.uu.se>

Hi Russell,

should I resend the patch with the comment by Mikael?

Thanks,
Michal


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