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

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Date:   Tue, 16 May 2017 13:37:11 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>
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 2017/05/15 01:22PM, Steven Rostedt wrote:
> 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.

:facepalm:
I'll respin. Thanks.

- Naveen