Re: [PATCH] mm: fix -Wmissing-prototypes warnings

[Kees Cook <keescook@chromium.org>]

On Mon, Sep 09, 2019 at 09:52:40AM +0200, David Hildenbrand wrote:
> On 28.08.19 09:42, Yi Wang wrote:
> > We get two warnings when build kernel W=1:
> > mm/shuffle.c:36:12: warning: no previous prototype for ‘shuffle_show’
> > [-Wmissing-prototypes]
> > mm/sparse.c:220:6: warning: no previous prototype for
> > ‘subsection_mask_set’ [-Wmissing-prototypes]
> > 
> > Make the function static to fix this.
> > 
> > Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
> > ---
> >  mm/shuffle.c | 2 +-
> >  mm/sparse.c  | 2 +-
> >  2 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/mm/shuffle.c b/mm/shuffle.c
> > index 3ce1248..b3fe97f 100644
> > --- a/mm/shuffle.c
> > +++ b/mm/shuffle.c
> > @@ -33,7 +33,7 @@ __meminit void page_alloc_shuffle(enum mm_shuffle_ctl ctl)
> >  }
> >  
> >  static bool shuffle_param;
> > -extern int shuffle_show(char *buffer, const struct kernel_param *kp)
> > +static int shuffle_show(char *buffer, const struct kernel_param *kp)
> >  {
> >  	return sprintf(buffer, "%c\n", test_bit(SHUFFLE_ENABLE, &shuffle_state)
> >  			? 'Y' : 'N');
> > diff --git a/mm/sparse.c b/mm/sparse.c
> > index 72f010d..49006dd 100644
> > --- a/mm/sparse.c
> > +++ b/mm/sparse.c
> > @@ -217,7 +217,7 @@ static inline unsigned long first_present_section_nr(void)
> >  	return next_present_section_nr(-1);
> >  }
> >  
> > -void subsection_mask_set(unsigned long *map, unsigned long pfn,
> > +static void subsection_mask_set(unsigned long *map, unsigned long pfn,
> >  		unsigned long nr_pages)
> >  {
> >  	int idx = subsection_map_index(pfn);
> > 
> 
> Reviewed-by: David Hildenbrand <david@redhat.com>

Reviewed-by: Kees Cook <keescook@chromium.org>

Andrew, can you take this?

-- 
Kees Cook