linux-kernel - Re: [PATCH] coredump: fix compile warning when ELF

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Message-ID: <Y4VCxuC5UgY80R3t@xhacker>
Date:   Tue, 29 Nov 2022 07:22:46 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] coredump: fix compile warning when ELF_CORE=n while
 COREDUMP=y

On Mon, Nov 28, 2022 at 08:29:56PM +0530, Ritesh Harjani (IBM) wrote:
> On 22/11/28 09:50PM, Jisheng Zhang wrote:
> > fix below build warning when ELF_CORE=n while COREDUMP=y:
> >
> > fs/coredump.c:834:12: warning: ‘dump_emit_page’ defined but not used [-Wunused-function]
> >   834 | static int dump_emit_page(struct coredump_params *cprm, struct
> >       page *page)
> >       |            ^~~~~~~~~~~~~~
> 
> Fixes: 06bbaa6dc53c: "[coredump] don't use __kernel_write() on kmap_local_page()"
> 
> >
> > Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> > ---
> >  fs/coredump.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/fs/coredump.c b/fs/coredump.c
> > index 7bad7785e8e6..8663042ebe9c 100644
> > --- a/fs/coredump.c
> > +++ b/fs/coredump.c
> > @@ -831,6 +831,7 @@ static int __dump_skip(struct coredump_params *cprm, size_t nr)
> >  	}
> >  }
> >
> > +#ifdef CONFIG_ELF_CORE
> 
> Instead of this ^^^, we could even move the definition of dump_emit_page() in
> the same #ifdef as of dump_user_range(). Since dump_user_range() is the only
> caller of dump_emit_page().
> 
> #ifdef CONFIG_ELF_CORE
> [here]
> int dump_user_range(struct coredump_params *cprm, unsigned long start,
> 		    unsigned long len)
> {..}
> #endif
> 

I planed to patch like this, but I saw the final patch diffstat was
a bit more. I'll send out a v2.

Thanks

> But I guess that's just a nitpick. Feel free to add:
> 
> Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
> 
> -ritesh
> 
> >  static int dump_emit_page(struct coredump_params *cprm, struct page *page)
> >  {
> >  	struct bio_vec bvec = {
> > @@ -863,6 +864,7 @@ static int dump_emit_page(struct coredump_params *cprm, struct page *page)
> >
> >  	return 1;
> >  }
> > +#endif
> >
> >  int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
> >  {
> > --
> > 2.37.2
> >