linux-kernel - Re: [PATCH 07/10] ftrace: pass KBUILD_CFLAGS to record

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Date:	Tue, 3 Aug 2010 22:12:47 +0530
From:	Rabin Vincent <rabin@....in>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 07/10] ftrace: pass KBUILD_CFLAGS to record_mcount.pl

Steven, Frederic,

I'd like to resurrect this old ARM dynamic ftrace patchset.  It still
applies on next except for a small merge conflict in one of the
ARM-specific patches.

On Sat, Mar 13, 2010 at 12:19:44PM +0530, Rabin Vincent wrote:
> On ARM, we have two ABIs, and the ABI used is controlled via a config
> option.  Object files built with one ABI can't be merged with object
> files built with the other ABI.  So, record_mcount.pl needs to use the
> same compiler flags as the kernel when generating the object file with
> the mcount locations.  Ensure this by passing CFLAGS to the script.
> 
> Signed-off-by: Rabin Vincent <rabin@....in>

This is the only non-arch/arm/ patch in the series which doesn't have
either of your Acked-bys, so if you'd be willing to ack it, I'll send in
the lot via rmk's ARM patch system for .37.

Alternatively, this one and "[PATCH 03/10] ftrace: allow building
without frame pointers" could go in via the tracing tree for .36?  Then
I'll send in the ARM specific stuff for .37 via the ARM tree.

Thanks,
Rabin

> ---
>  scripts/Makefile.build |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 0b94d2f..2535c11 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -209,7 +209,8 @@ ifdef CONFIG_FTRACE_MCOUNT_RECORD
>  cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
>  	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
>  	"$(if $(CONFIG_64BIT),64,32)" \
> -	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
> +	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
> +	"$(LD)" "$(NM)" "$(RM)" "$(MV)" \
>  	"$(if $(part-of-module),1,0)" "$(@)";
>  endif
>  
> -- 
> 1.7.0
> 
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