linux-kernel - Re: [PATCH] tracing: initialize variable in create_dyn

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Date:   Thu, 14 Mar 2019 14:05:02 -0700
From:   Frank Rowand <frowand.list@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: Re: [PATCH] tracing: initialize variable in create_dyn_event()

Hi Steve,

Ping.

-Frank


On 1/24/19 6:17 PM, frowand.list@...il.com wrote:
> From: Frank Rowand <frank.rowand@...y.com>
> 
> Fix compile warning in create_dyn_event(): 'ret' may be used uninitialized
> in this function [-Wuninitialized].
> 
> Fixes: 5448d44c3855 ("tracing: Add unified dynamic event framework")
> 
> Signed-off-by: Frank Rowand <frank.rowand@...y.com>
> ---
> 
> Compile and boot tested only.  Please verify the initialization value
> of zero is correct.
> 
> There is also a sparse warning you might want to check into (when
> ARCH=arm, so 32 bit):
> 
>    include/uapi/linux/perf_event.h:147:56: warning: cast truncates bits from constant value (8000000000000000 becomes 0)
> 
> 
>  kernel/trace/trace_dynevent.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
> index dd1f43588d70..4f633476c307 100644
> --- a/kernel/trace/trace_dynevent.c
> +++ b/kernel/trace/trace_dynevent.c
> @@ -74,7 +74,7 @@ int dyn_event_release(int argc, char **argv, struct dyn_event_operations *type)
>  static int create_dyn_event(int argc, char **argv)
>  {
>  	struct dyn_event_operations *ops;
> -	int ret;
> +	int ret = 0;
>  
>  	if (argv[0][0] == '-' || argv[0][0] == '!')
>  		return dyn_event_release(argc, argv, NULL);
>