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)
      |            ^~~~~~~~~~~~~~

Signed-off-by: Jisheng Zhang <jszhang@kernel.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
 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

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@kernel.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

But I guess that's just a nitpick. Feel free to add:

Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.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
>

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@kernel.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@gmail.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
> >