linux-kernel - Re: [PATCH 1/2] libsubcmd: Fix OPT_CALLBACK

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Date:   Fri, 17 Jul 2020 09:10:45 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     acme@...hat.com
Cc:     jolsa@...hat.com, linux-kernel@...r.kernel.org,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: Re: [PATCH 1/2] libsubcmd: Fix OPT_CALLBACK_SET()

Hi Arnaldo,

Can you please consider this trivial fix.

Ravi

On 6/19/20 7:04 PM, Ravi Bangoria wrote:
> Any option macro with _SET suffix should set opt->set variable which
> is not happening for OPT_CALLBACK_SET(). This is causing issues with
> perf record --switch-output-event. Fix that.
> 
> Before:
>    # ./perf record --overwrite -e sched:*switch,syscalls:sys_enter_mmap \
>             --switch-output-event syscalls:sys_enter_mmap
>    ^C[ perf record: Woken up 1 times to write data ]
>    [ perf record: Captured and wrote 0.297 MB perf.data (657 samples) ]
> 
> After:
> 
>    $ ./perf record --overwrite -e sched:*switch,syscalls:sys_enter_mmap \
>            --switch-output-event syscalls:sys_enter_mmap
>    [ perf record: dump data: Woken up 1 times ]
>    [ perf record: Dump perf.data.2020061918144542 ]
>    [ perf record: dump data: Woken up 1 times ]
>    [ perf record: Dump perf.data.2020061918144608 ]
>    [ perf record: dump data: Woken up 1 times ]
>    [ perf record: Dump perf.data.2020061918144660 ]
>    ^C[ perf record: dump data: Woken up 1 times ]
>    [ perf record: Dump perf.data.2020061918144784 ]
>    [ perf record: Woken up 0 times to write data ]
>    [ perf record: Dump perf.data.2020061918144803 ]
>    [ perf record: Captured and wrote 0.419 MB perf.data.<timestamp> ]
> 
> Fixes: 636eb4d001b1 ("libsubcmd: Introduce OPT_CALLBACK_SET()")
> Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
> ---
>   tools/lib/subcmd/parse-options.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/tools/lib/subcmd/parse-options.c b/tools/lib/subcmd/parse-options.c
> index dbb9efbf718a..39ebf6192016 100644
> --- a/tools/lib/subcmd/parse-options.c
> +++ b/tools/lib/subcmd/parse-options.c
> @@ -237,6 +237,9 @@ static int get_value(struct parse_opt_ctx_t *p,
>   		return err;
>   
>   	case OPTION_CALLBACK:
> +		if (opt->set)
> +			*(bool *)opt->set = true;
> +
>   		if (unset)
>   			return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
>   		if (opt->flags & PARSE_OPT_NOARG)
>