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Re: [PATCH v2 13/13] perf tools: add feature header record to pipe-mode

From Jiri Olsa <jolsa@redhat.com>
Newsgroups linux.kernel
Subject Re: [PATCH v2 13/13] perf tools: add feature header record to pipe-mode
Date 2017-05-25 10:20 +0200
Message-ID <tKW9X-5J4-21@gated-at.bofh.it> (permalink)
References <tKcTv-a4-3@gated-at.bofh.it> <tKcTw-a4-23@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tue, May 23, 2017 at 12:48:53AM -0700, David Carrillo-Cisneros wrote:

SNIP

> +	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
> +		if (!feat_ops[feat].has_record) {
> +			pr_debug("No record header feature for header :%d\n", feat);
> +			continue;
> +		}
> +
> +		fdd.offset = sizeof(*fe);
> +
> +		ret = feat_ops[feat].write(&fdd, evlist);
> +		if (ret || fdd.offset <= (ssize_t)sizeof(*fe)) {
> +			pr_debug("Error writing feature\n");
> +			continue;
> +		}
> +
> +		/* fdd.buf may have changed due to realloc in do_write() */
> +		fe = fdd.buf;
> +		memset(fe, 0, sizeof(*fe));

no need to wipe it out if you set all the members just below
(apart from header.misc, which is not used)

jirka

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Thread

[PATCH v2 13/13] perf tools: add feature header record to pipe-mode David Carrillo-Cisneros <davidcc@google.com> - 2017-05-23 10:00 +0200
  Re: [PATCH v2 13/13] perf tools: add feature header record to  pipe-mode Namhyung Kim <namhyung@kernel.org> - 2017-05-24 17:50 +0200
  Re: [PATCH v2 13/13] perf tools: add feature header record to  pipe-mode Jiri Olsa <jolsa@redhat.com> - 2017-05-25 10:10 +0200
  Re: [PATCH v2 13/13] perf tools: add feature header record to  pipe-mode Jiri Olsa <jolsa@redhat.com> - 2017-05-25 10:20 +0200
    Re: [PATCH v2 13/13] perf tools: add feature header record to pipe-mode David Carrillo-Cisneros <davidcc@google.com> - 2017-06-06 03:40 +0200
      Re: [PATCH v2 13/13] perf tools: add feature header record to  pipe-mode Jiri Olsa <jolsa@redhat.com> - 2017-06-06 13:10 +0200
        Re: [PATCH v2 13/13] perf tools: add feature header record to pipe-mode David Carrillo-Cisneros <davidcc@google.com> - 2017-06-06 20:20 +0200
  Re: [PATCH v2 13/13] perf tools: add feature header record to  pipe-mode Jiri Olsa <jolsa@redhat.com> - 2017-05-25 10:20 +0200
  Re: [PATCH v2 13/13] perf tools: add feature header record to  pipe-mode Jiri Olsa <jolsa@redhat.com> - 2017-05-25 10:20 +0200
    Re: [PATCH v2 13/13] perf tools: add feature header record to  pipe-mode Jiri Olsa <jolsa@redhat.com> - 2017-06-06 13:10 +0200
  Re: [PATCH v2 13/13] perf tools: add feature header record to  pipe-mode Jiri Olsa <jolsa@redhat.com> - 2017-05-25 10:20 +0200
  Re: [PATCH v2 13/13] perf tools: add feature header record to  pipe-mode Jiri Olsa <jolsa@redhat.com> - 2017-05-25 10:20 +0200

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