linux-kernel - Re: [PATCH] vhost: Use ERR_CAST inlined function instead of ERR_PTR(PTR

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Message-ID: <20250716045617-mutt-send-email-mst@kernel.org>
Date: Wed, 16 Jul 2025 04:57:33 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Pei Xiao <xiaopei01@...inos.cn>
Cc: virtualization@...ts.linux.dev, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [PATCH] vhost:  Use ERR_CAST inlined function instead of
 ERR_PTR(PTR_ERR(...))

On Wed, Jun 04, 2025 at 02:55:48PM +0800, Pei Xiao wrote:
> cocci warning:
> ./kernel/vhost_task.c:148:9-16: WARNING: ERR_CAST can be used with tsk
> 
> Use ERR_CAST inlined function instead of ERR_PTR(PTR_ERR(...)).
> 
> Signed-off-by: Pei Xiao <xiaopei01@...inos.cn>
> ---
>  kernel/vhost_task.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/vhost_task.c b/kernel/vhost_task.c
> index 2f844c279a3e..8c4a82c0bdbe 100644
> --- a/kernel/vhost_task.c
> +++ b/kernel/vhost_task.c
> @@ -111,7 +111,7 @@ EXPORT_SYMBOL_GPL(vhost_task_stop);
>   * @arg: data to be passed to fn and handled_kill
>   * @name: the thread's name
>   *
> - * This returns a specialized task for use by the vhost layer or ERR_PTR() on
> + * This returns a specialized task for use by the vhost layer or ERR_CAST() on

ERR_PTR is the type so it's appropriate here, I think.


>   * failure. The returned task is inactive, and the caller must fire it up
>   * through vhost_task_start().
>   */
> @@ -145,7 +145,7 @@ struct vhost_task *vhost_task_create(bool (*fn)(void *),
>  	tsk = copy_process(NULL, 0, NUMA_NO_NODE, &args);
>  	if (IS_ERR(tsk)) {
>  		kfree(vtsk);
> -		return ERR_PTR(PTR_ERR(tsk));
> +		return ERR_CAST(tsk);
>  	}
>  
>  	vtsk->task = tsk;
> -- 
> 2.25.1