linux-kernel - Re: [PATCH perf/core v2 0/8] perf tools: Update strbuf to remove xrealloc

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Date:	Fri, 29 Apr 2016 12:14:29 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <mhiramat@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH perf/core v2 0/8] perf tools: Update strbuf to remove
 xrealloc

Em Sat, Apr 30, 2016 at 12:09:41AM +0900, Masami Hiramatsu escreveu:
> Hi Arnaldo, 
> 
> Here is the 2nd version of the strbuf update, and just rebased on
> the latest perf/core :) In order to avoid confusion, I've added
> v2 on tag.
> 
> This patch series does refactoring strbuf and xrealloc related code
> to remove xrealloc since it can call die() to exit immediately when
> it hits any error. Instead of that, it should return error code to
> the caller so that the caller can handle its error.
> 
> Thus, at first, this changes the strbuf APIs to return error code
> instead of die() immediately. And then changing API callers according
> to the following rules.
>  - Check the return value of strbuf APIs and handle errors and,
>    - If the caller returns an error code (errno), it returns
>      the return value of strbuf APIs.
>    - If the caller just return -1 or NULl in error case, it also
>      returns -1 or NULL in case of strbuf error. 
>    - If the caller can call die() directly, it also call die()
>      in case of strbuf error.
>  - Error checking patches are splitted for each subcommand, since
>    it will help review.
> 
> This also removes xrealloc and ALLOC_GROW from libperf, so that no
> one use it anymore.

Thanks a lot, I'll try reviewing this this weekend,

- Arnaldo
 
> Thank you,
> 
> ---
> 
> Masami Hiramatsu (8):
>       perf: Rewrite strbuf not to die
>       perf probe: Check the return value of strbuf APIs
>       perf help: Make check_emacsclient_version to check strbuf APIs
>       perf: Make alias handler to check return value of strbuf
>       perf header: Make topology checkers to check return value of strbuf
>       perf pmu: Make pmu_formats_string to check return value of strbuf
>       perf help: Do not use ALLOC_GROW in add_cmd_list
>       perf tools: Remove xrealloc and ALLOC_GROW
> 
> 
>  tools/perf/builtin-help.c          |   18 ++--
>  tools/perf/perf.c                  |    8 +-
>  tools/perf/util/Build              |    1 
>  tools/perf/util/cache.h            |   19 -----
>  tools/perf/util/dwarf-aux.c        |   50 +++++-------
>  tools/perf/util/header.c           |   31 +++++---
>  tools/perf/util/help-unknown-cmd.c |   30 +++++--
>  tools/perf/util/pmu.c              |   10 +-
>  tools/perf/util/probe-event.c      |  146 +++++++++++++++++++++---------------
>  tools/perf/util/probe-finder.c     |   30 ++++---
>  tools/perf/util/quote.c            |   36 +++++----
>  tools/perf/util/quote.h            |    2 
>  tools/perf/util/strbuf.c           |   93 +++++++++++++++++------
>  tools/perf/util/strbuf.h           |   25 ++++--
>  tools/perf/util/util.h             |    6 -
>  tools/perf/util/wrapper.c          |   29 -------
>  16 files changed, 291 insertions(+), 243 deletions(-)
>  delete mode 100644 tools/perf/util/wrapper.c
> 
> --
> Masami Hiramatsu