linux-kernel - Re: [PATCH v7 perf,bpf 12/15] perf, bpf: enable annotation of bpf program

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Message-ID: <20190311175641.GA19721@krava>
Date:   Mon, 11 Mar 2019 18:56:41 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        kernel-team@...com, peterz@...radead.org, acme@...hat.com,
        jolsa@...nel.org, namhyung@...nel.org
Subject: Re: [PATCH v7 perf,bpf 12/15] perf, bpf: enable annotation of bpf
 program

On Thu, Mar 07, 2019 at 09:58:07AM -0800, Song Liu wrote:

SNIP

> +		if (linfo && btf) {
> +			srcline = btf__name_by_offset(btf, linfo->line_off);
> +			nr_skip++;
> +		} else
> +			srcline = NULL;
> +
> +		fprintf(s, "\n");
> +		prev_buf_size = buf_size;
> +		fflush(s);
> +
> +		if (!opts->hide_src_code && srcline) {
> +			args->offset = -1;
> +			args->line = strdup(srcline);
> +			args->line_nr = 0;
> +			args->ms.sym  = sym;
> +			dl = disasm_line__new(args);
> +			if (dl) {
> +				annotation_line__add(&dl->al,
> +						     &notes->src->source);
> +			}
> +		}

I still miss answer for why is the line added twice for
!opts->hide_src_code && srcline ? code up and down

jirka

> +
> +		args->offset = pc;
> +		args->line = buf + prev_buf_size;
> +		args->line_nr = 0;
> +		args->ms.sym  = sym;
> +		dl = disasm_line__new(args);
> +		if (dl)
> +			annotation_line__add(&dl->al, &notes->src->source);
> +
> +		pc += count;
> +	} while (count > 0 && pc < len);

SNIP