linux-kernel - Re: [PATCH 3/3] tracing/probes: Fix return value when "(fault)" is injected

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Date:   Wed, 5 Jul 2023 22:49:56 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     Dan Carpenter <dan.carpenter@...aro.org>,
        linux-trace-kernel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] tracing/probes: Fix return value when "(fault)" is
 injected

On Sun,  2 Jul 2023 23:47:35 +0900
"Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:

> From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> When the "(fault)" is injected, the return value of fetch_store_string*()
> should be the length of the "(fault)", but an error code is returned.
> Fix it to return the correct length and update the data_loc according the
> updated length.
> This needs to update a ftracetest test case, which expects trace output
> to appear as '(fault)' instead of '"(fault)"'.
> 

Ah, because of patch 2, the ret < 0 makes it return without printing the
"fault"?

Reviewed-by: Steven Rostedt (Google) <rostedt@...dmis.org>

-- Steve


> Fixes: 2e9906f84fc7 ("tracing: Add "(fault)" name injection to kernel probes")
> Cc: stable@...r.kernel.org
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> ---