linux-kernel - Re: [PATCH 3/3] perf stat: Add --metrics-file option

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Message-ID: <20200423132446.GN1136647@krava>
Date:   Thu, 23 Apr 2020 15:24:46 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <ak@...ux.intel.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>,
        Joe Mario <jmario@...hat.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>
Subject: Re: [PATCH 3/3] perf stat: Add --metrics-file option

On Tue, Apr 21, 2020 at 01:06:30PM -0700, Andi Kleen wrote:
> > > Also there are some asserts that can be triggered by expressions. I think
> > > you should fix those too and convert them to errors.
> > 
> > do you have some details on this? examples of those failures?
> 
> At a minimum 
> 
> /* Caller must make sure id is allocated */
> void expr__add_id(struct parse_ctx *ctx, const char *name, double val)
> {
>         int idx;
>         assert(ctx->num_ids < MAX_PARSE_ID);
> 
> 
> -Andi
> 

I did it and then I realized this is already caught in the parsing
code (expr.y) with this check:

        if (ctx->num_ids + 1 >= EXPR_MAX_OTHER) {
                pr_err("failed: way too many variables\n");
                YYABORT;
        }

so that assert can stay there and shouldn't be ever hit

jirka