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

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Date:   Fri, 17 Jul 2020 09:34:35 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Cc:     acme@...hat.com, jolsa@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] libsubcmd: Fix OPT_CALLBACK_SET()

Em Fri, Jul 17, 2020 at 09:10:45AM +0530, Ravi Bangoria escreveu:
> Hi Arnaldo,
> 
> Can you please consider this trivial fix.

Trivial but important, sorry for taking so long, applied to perf/urgent,
aimed at v5.8,

- Arnaldo
 
> 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)
> > 

-- 

- Arnaldo