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Message-ID: <Y9eYbPuq5Nw9Njxf@kernel.org>
Date: Mon, 30 Jan 2023 12:14:04 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Hyunmin Lee <hn.min.lee@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Uladzislau Rezki <urezki@...il.com>,
Christoph Hellwig <hch@...radead.org>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] replace BUG_ON to WARN_ON
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@...el.com>
> Co-Developed-by: Jeungwoo Yoo <casionwoo@...il.com>
> Co-Developed-by: Sangyun Kim <sangyun.kim@....ac.kr>
> Signed-off-by: Hyunmin Lee <hn.min.lee@...il.com>
> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@...el.com>
> Signed-off-by: Jeungwoo Yoo <casionwoo@...il.com>
> Signed-off-by: Sangyun Kim <sangyun.kim@....ac.kr>
> Cc: Hyeonggon Yoo <42.hyeyoo@...il.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.
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