linux-kernel - Re: [PATCH] xen/evtchn: replace if (cond) BUG() with BUG

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Date:   Wed, 17 Mar 2021 18:31:20 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc:     jgross@...e.com, sstabellini@...nel.org,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen/evtchn: replace if (cond) BUG() with BUG_ON()


On 3/16/21 11:04 PM, Jiapeng Chong wrote:
> Fix the following coccicheck warnings:
>
> ./drivers/xen/evtchn.c:412:2-5: WARNING: Use BUG_ON instead of if
> condition followed by BUG.
>
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
> ---
>  drivers/xen/evtchn.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
> index c99415a..b1c59bc 100644
> --- a/drivers/xen/evtchn.c
> +++ b/drivers/xen/evtchn.c
> @@ -408,8 +408,7 @@ static int evtchn_bind_to_user(struct per_user_data *u, evtchn_port_t port)
>  err:
>  	/* bind failed, should close the port now */
>  	close.port = port;
> -	if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
> -		BUG();
> +	BUG_ON(HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0);



Is it actually worth doing a BUG() here at all? Seems to me WARN_ON_ONCE() should be sufficient.


-boris


>  	del_evtchn(u, evtchn);
>  	return rc;
>  }