linux-kernel - Re: [PATCH 1/4] ftrace: Simplify glob handling in unregister_ftrace_function_probe

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Message-ID: <20170515132210.5efab11c@gandalf.local.home>
Date:   Mon, 15 May 2017 13:22:10 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:     Shuah Khan <shuah@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 1/4] ftrace: Simplify glob handling in
 unregister_ftrace_function_probe_func()

On Sun, 14 May 2017 01:01:01 +0530
"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> wrote:

> Handle a NULL glob properly.
> 
> Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> ---
>  kernel/trace/ftrace.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 39dca4e86a94..28dc824ad072 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -4144,9 +4144,9 @@ unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
>  	int i, ret = -ENODEV;
>  	int size;
>  
> -	if (glob && (strcmp(glob, "*") == 0 || !strlen(glob)))
> +	if (!glob || (glob && (strcmp(glob, "*") == 0 || !strlen(glob))))

Actually, this can also be simplified.

	if (!glob || strcmp(glob, "*") == 0) || !strlen(glob))

No need to check if glob exists past the first expression.

-- Steve

>  		func_g.search = NULL;
> -	else if (glob) {
> +	else {
>  		int not;
>  
>  		func_g.type = filter_parse_regex(glob, strlen(glob),