Re: [PATCH] replace BUG_ON to WARN_ON

Mike Rapoport
2023-01-30T10:14:28Z

Hi,

On Fri, Jan 27, 2023 at 08:58:44PM +0900, Hyunmin Lee wrote:
> Replace unnacessary BUG_ON to WARN_ON. These BUG_ONs verify aruguments of a function. Thus, the WARN_ONs return an EINVAL error when their condition is true.

Some users enable panic_on_warn, so for them WARN_ON will still crash a
machine.

I think a simple if() will be sufficient.

> Co-Developed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
> Co-Developed-by: Jeungwoo Yoo <casionwoo@gmail.com>
> Co-Developed-by: Sangyun Kim <sangyun.kim@snu.ac.kr>
> Signed-off-by: Hyunmin Lee <hn.min.lee@gmail.com>
> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
> Signed-off-by: Jeungwoo Yoo <casionwoo@gmail.com>
> Signed-off-by: Sangyun Kim <sangyun.kim@snu.ac.kr>
> Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
> ---
> mm/vmalloc.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 74afa2208558..9f9dba3132c5 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -1587,9 +1587,14 @@ static struct vmap_area *alloc_vmap_area(unsigned long size,
> int purged = 0;
> int ret;
>
> - BUG_ON(!size);
> - BUG_ON(offset_in_page(size));
> - BUG_ON(!is_power_of_2(align));
> + if (WARN_ON(!size))
> + return ERR_PTR(-EINVAL);
> +
> + if (WARN_ON(offset_in_page(size)))
> + return ERR_PTR(-EINVAL);
> +
> + if (WARN_ON(!is_power_of_2(align)))
> + return ERR_PTR(-EINVAL);
>
> if (unlikely(!vmap_initialized))
> return ERR_PTR(-EBUSY);
> --
> 2.25.1
>
>

--
Sincerely yours,
Mike.