linux-kernel - Re: [PATCH] b/arch/x86/mm/pti.c

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Date:   Thu, 21 Mar 2019 15:33:30 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Dave Hansen <dave.hansen@...el.com>
cc:     Valdis Klētnieks <valdis.kletnieks@...edu>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] b/arch/x86/mm/pti.c - make local symbols static

On Tue, 12 Mar 2019, Dave Hansen wrote:

> > Make both variables static.
> 
> "pti_set_kernel_image_nonglobal(void)" is an awfully funny looking
> variable. ;)
> 
> > Signed-off-by: Valdis Kletnieks <valdis.kletnieks@...edu>
> > 
> > ---
> > diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
> > index 4fee5c3003ed..139b28a01ce4 100644
> > --- a/arch/x86/mm/pti.c
> > +++ b/arch/x86/mm/pti.c
> > @@ -77,7 +77,7 @@ static void __init pti_print_if_secure(const char *reason)
> >  		pr_info("%s\n", reason);
> >  }
> >  
> > -enum pti_mode {
> > +static enum pti_mode {
> 
> I'm struggling to figure out why we would want to do this.  If there's a
> really good reason, I think we probably need to do it en masse:

Because its:

enum pti_mode {
 ....
} pti_mode;

So that's both enum and variable declaration. 

> $ grep -r '^enum.{' arch/x86/ | wc -l
> 48

In the other cases it's a enum declaration without declaring a variable at
the same time. Making them static would be obviously bogus.

Thanks,

	tglx