linux-kernel - Re: [PATCH] s390/mm: Silence compiler warning when compiling without CONFIG

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Message-Id: <20190408132823.GA13200@osiris>
Date:   Mon, 8 Apr 2019 15:28:23 +0200
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Thomas Huth <thuth@...hat.com>
Cc:     David Hildenbrand <david@...hat.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] s390/mm: Silence compiler warning when compiling without
 CONFIG_PGSTE

On Mon, Apr 08, 2019 at 12:36:32PM +0200, Thomas Huth wrote:
> On 08/04/2019 09.09, David Hildenbrand wrote:
> > On 07.04.19 14:55, Thomas Huth wrote:
> >> If CONFIG_PGSTE is not set (e.g. when compiling without KVM), GCC complains:
> >>
> >>   CC      arch/s390/mm/pgtable.o
> >> arch/s390/mm/pgtable.c:413:15: warning: ‘pmd_alloc_map’ defined but not
> >>  used [-Wunused-function]
> >>  static pmd_t *pmd_alloc_map(struct mm_struct *mm, unsigned long addr)
> >>                ^~~~~~~~~~~~~
> >>
> >> Wrap the function with "#ifdef CONFIG_PGSTE" to silence the warning.
> >>
> >> Signed-off-by: Thomas Huth <thuth@...hat.com>
> >> ---
> >>  arch/s390/mm/pgtable.c | 2 ++
> >>  1 file changed, 2 insertions(+)
> >>
> >> diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
> >> index 8485d6dc2754..9ebd01219812 100644
> >> --- a/arch/s390/mm/pgtable.c
> >> +++ b/arch/s390/mm/pgtable.c
> >> @@ -410,6 +410,7 @@ static inline pmd_t pmdp_flush_lazy(struct mm_struct *mm,
> >>  	return old;
> >>  }
> >>  
> >> +#ifdef CONFIG_PGSTE
> >>  static pmd_t *pmd_alloc_map(struct mm_struct *mm, unsigned long addr)
> >>  {
> >>  	pgd_t *pgd;
> >> @@ -427,6 +428,7 @@ static pmd_t *pmd_alloc_map(struct mm_struct *mm, unsigned long addr)
> >>  	pmd = pmd_alloc(mm, pud, addr);
> >>  	return pmd;
> >>  }
> >> +#endif
> >>  
> > 
> > We could also move the function down to the functions where it is used
> 
> Yeah, I thought about that, too. Both have advantages:
> 
> - If we keep the code here, "git blame" shows a nicer history of these
>   lines
> - If we move the code, we need less #ifdefs
> 
> I'll leave the decision to the maintainers... Martin, Heiko?

Applied without changes. Thanks!