linux-kernel - Re: [PATCH v4 0/3] tracing/user_events: Fix incorrect return value for writes when events are disabled and add its tests

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Message-ID: <20230626163621.GA104@W11-BEAU-MD.localdomain>
Date:   Mon, 26 Jun 2023 09:36:21 -0700
From:   Beau Belgrave <beaub@...ux.microsoft.com>
To:     sunliming <sunliming@...inos.cn>
Cc:     rostedt@...dmis.org, mhiramat@...nel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 0/3] tracing/user_events: Fix incorrect return value
 for writes when events are disabled and add its tests

On Mon, Jun 26, 2023 at 07:13:41PM +0800, sunliming wrote:
> Now the writing operation return the count of writes regardless of whether
> events are enabled or disabled. Fix this by just return -EBADF when events
> are disabled.
> 
> v3 -> v4:
> - Change the return value from zero to -EBADF
> 

Applied these locally, ran a few tests. This looks good to me.

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

Thanks,
-Beau

> v2 -> v3:
> - Change the return value from -ENOENT to zero
> 
> v1 -> v2:
> - Change the return value from -EFAULT to -ENOENT
> 
> sunliming (3):
>   tracing/user_events: Fix incorrect return value for writing operation
>     when events are disabled
>   selftests/user_events: Enable the event before write_fault test in
>     ftrace self-test
>   selftests/user_events: Add test cases when event is disabled
> 
>  kernel/trace/trace_events_user.c                  | 3 ++-
>  tools/testing/selftests/user_events/ftrace_test.c | 8 ++++++++
>  2 files changed, 10 insertions(+), 1 deletion(-)
> 
> -- 
> 2.25.1