linux-kernel - Re: [PATCH 05/10] perf tools: Add expr__del

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Date:   Sun, 28 Jun 2020 23:52:40 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>,
        "Paul A. Clarke" <pc@...ibm.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 05/10] perf tools: Add expr__del_id function

On Fri, Jun 26, 2020 at 01:55:37PM -0700, Ian Rogers wrote:
> On Fri, Jun 26, 2020 at 12:47 PM Jiri Olsa <jolsa@...nel.org> wrote:
> >
> > Adding expr__del_id function to remove ID from hashmap.
> > It will save us few lines in following changes.
> >
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  tools/perf/util/expr.c | 21 +++++++++++++--------
> >  tools/perf/util/expr.h |  1 +
> >  2 files changed, 14 insertions(+), 8 deletions(-)
> >
> > diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
> > index 29cdef18849c..aa14c7111ecc 100644
> > --- a/tools/perf/util/expr.c
> > +++ b/tools/perf/util/expr.c
> > @@ -75,6 +75,17 @@ int expr__get_id(struct expr_parse_ctx *ctx, const char *id,
> >         return hashmap__find(&ctx->ids, id, (void **)data) ? 0 : -1;
> >  }
> >
> > +void expr__del_id(struct expr_parse_ctx *ctx, const char *id)
> > +{
> > +       struct expr_parse_data *old_val = NULL;
> > +       char *old_key = NULL;
> > +
> > +       hashmap__delete(&ctx->ids, id,
> > +                       (const void **)&old_key, (void **)&old_val);
> > +       free(old_key);
> > +       free(old_val);
> > +}
> > +
> >  void expr__ctx_init(struct expr_parse_ctx *ctx)
> >  {
> >         hashmap__init(&ctx->ids, key_hash, key_equal, NULL);
> > @@ -132,16 +143,10 @@ int expr__parse(double *final_val, struct expr_parse_ctx *ctx,
> >  int expr__find_other(const char *expr, const char *one,
> >                      struct expr_parse_ctx *ctx, int runtime)
> >  {
> > -       struct expr_parse_data *old_val = NULL;
> > -       char *old_key = NULL;
> >         int ret = __expr__parse(NULL, ctx, expr, EXPR_OTHER, runtime);
> >
> > -       if (one) {
> > -               hashmap__delete(&ctx->ids, one,
> > -                               (const void **)&old_key, (void **)&old_val);
> > -               free(old_key);
> > -               free(old_val);
> > -       }
> > +       if (one)
> > +               expr__del_id(ctx, one);
> 
> Nit, I always have to read the code to know why we have "one" as an
> argument. Could we remove it as an argument and have the caller use
> expr__del_id?

I'll check sounds like good thing to do

thanks,
jirka