linux-kernel - Re: [PATCH] init/version.c: Define version_string only if CONFIG

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Message-Id: <1216070438.6497.27.camel@dguilak-desk>
Date:	Mon, 14 Jul 2008 14:20:38 -0700
From:	Daniel Guilak <guilak@...ux.vnet.ibm.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	linux-kernel@...r.kernel.org, trivial@...nel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	daniel@...ielguilak.com
Subject: Re: [PATCH] init/version.c: Define version_string only if
	CONFIG_KALLSYMS is not defined.

On Mon, 2008-07-14 at 12:38 -0700, Randy Dunlap wrote:
> On Mon, 14 Jul 2008 12:04:46 -0700 Daniel Guilak wrote:
> 
> > int Version_* is only used with ksymoops, which is only needed (according to
> > README and Documentation/Changes) if CONFIG_KALLSYMS is NOT defined.  Therefore
> > this patch defines version_string only if CONFIG_KALLSYMS is not defined.
> > 
> > Signed-off-by: Daniel Guilak <daniel@...ielguilak.com>
> > ---
> >  init/version.c |    2 ++
> >  1 files changed, 2 insertions(+), 0 deletions(-)
> > 
> > Depends on "[PATCH] init/version.c: Silenced sparse warning by declaring the version string."
> > 
> > diff --git a/init/version.c b/init/version.c
> > index 041fd82..52a8b98 100644
> > --- a/init/version.c
> > +++ b/init/version.c
> > @@ -13,11 +13,13 @@
> >  #include <linux/utsrelease.h>
> >  #include <linux/version.h>
> >  
> > +#ifndef CONFIG_KALLSYMS
> >  #define version(a) Version_ ## a
> >  #define version_string(a) version(a)
> >  
> >  extern int version_string(LINUX_VERSION_CODE);
> >  int version_string(LINUX_VERSION_CODE);
> > +#endif
> >  
> >  struct uts_namespace init_uts_ns = {
> >  	.kref = {
> > -- 
> 
> Does not apply cleanly to linux-2.6.26, linux-next-20080714, or Linus-git-head.
> 

Did you apply "[PATCH] init/version.c: Silenced sparse warning by
declaring the version string." beforehand? I just applied it on the most
recent tree and I didn't have any issues.

> and why do we ned both extern int version_string()
> and int version_string() ?
Because sparse was complaining that it wasn't prototyped or static.
There isn't a header file to put it in since it only exists to be a
kernel.
> ---
> ~Randy
> Linux Plumbers Conference, 17-19 September 2008, Portland, Oregon USA
> http://linuxplumbersconf.org/

--Daniel

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