linux-kernel - Re: [PATCH 4/6] h8300 CONFIG

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Date:	Sat, 16 Feb 2008 11:46:47 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/6] h8300 CONFIG_KALLSYMS fix

On Fri, Feb 15, 2008 at 10:32:01PM -0800, Andrew Morton wrote:
> On Sat, 16 Feb 2008 01:13:47 -0500 Yoshinori Sato <ysato@...rs.sourceforge.jp> wrote:
> 
> > Please comment "C_SYMBOL_PREFIX".
> > 
> >  Makefile           |    3 ++-
> >  arch/h8300/Kconfig |    4 ++++
> >  2 files changed, 6 insertions(+), 1 deletions(-)
> > 
> > diff --git a/Makefile b/Makefile
> > index c162370..745e31f 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -751,7 +751,8 @@ endef
> >  # Generate .S file with all kernel symbols
> >  quiet_cmd_kallsyms = KSYM    $@
> >        cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
> > -                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
> > +                     $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) \
> > +                     $(if $(CONFIG_C_SYMBOL_PREFIX),--symbol-prefix='_') > $@
> >  
> >  .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
> >  	$(call if_changed_dep,as_o_S)
> > diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
> > index 085dc6e..2804edd 100644
> > --- a/arch/h8300/Kconfig
> > +++ b/arch/h8300/Kconfig
> > @@ -87,6 +87,10 @@ config HZ
> >  	int
> >  	default 100
> >  
> > +config C_SYMBOL_PREFIX
> > +	bool
> > +	default y
> > +
> >  source "init/Kconfig"
> >  
> >  source "arch/h8300/Kconfig.cpu"
> > -- 

The intent with this patch is fine but we should go for
another implementation.

In arch/Kconfig we should put the general config symbol
that says if we use '_' or not - where the default is to
not use underscore.

Something like this:
diff --git a/arch/Kconfig b/arch/Kconfig
index 3d72dc3..f2928c5 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -29,3 +29,8 @@ config KPROBES

 config HAVE_KPROBES
        def_bool n
+
+# Architectures where binutils prefix C symbols with
+# underscore '_' shall select this symbol.
+config SYMBOL_C_PREFIX
+       bool


Then in the relevant architectures we should do a

 config H8300
+	select SYMBOL_C_PREFIX	# We prefix C symbols with '_'

And we should do this for all the relevant architectures:
blackfin, v850 springs to my mind.
For the other archs as separate patches via the respective
maintainers.

	Sam
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