linux-kernel - Re: [PATCH v3 1/3] tracing/user_events: Fix incorrect return value for writing operation when events are disable

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Date:   Thu, 22 Jun 2023 20:20:40 +0000
From:   Beau Belgrave <beaub@...ux.microsoft.com>
To:     sunliming <sunliming@...inos.cn>
Cc:     rostedt@...dmis.org, mhiramat@...nel.org, kelulanainsley@...il.com,
        linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] tracing/user_events: Fix incorrect return value
 for writing operation when events are disable

On Wed, Jun 21, 2023 at 02:08:24PM +0800, sunliming wrote:
> The writing operation return the count of writes regardless of whether events
> are enabled or disabled. Switch it to return 0 to indicates that the event
> is disabled.
> 
> Signed-off-by: sunliming <sunliming@...inos.cn>

This looks good to me.

Acked-by: Beau Belgrave <beaub@...ux.microsoft.com>

Thanks!

> ---
>  kernel/trace/trace_events_user.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c
> index 1ac5ba5685ed..c085ff829a58 100644
> --- a/kernel/trace/trace_events_user.c
> +++ b/kernel/trace/trace_events_user.c
> @@ -1957,7 +1957,8 @@ static ssize_t user_events_write_core(struct file *file, struct iov_iter *i)
>  
>  		if (unlikely(faulted))
>  			return -EFAULT;
> -	}
> +	} else
> +		return 0;
>  
>  	return ret;
>  }
> -- 
> 2.25.1