linux-kernel - Re: [PATCH v3 0/2] perf tests: Check for ARM [vectors] page

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Message-ID: <20181227105539.GA4521@sejong>
Date:   Thu, 27 Dec 2018 19:55:39 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-kernel@...r.kernel.org, cphealy@...il.com,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Kim Phillips <kim.phillips@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        rmk+kernel@...linux.org.uk, l.stach@...gutronix.de,
        kernel-team@....com
Subject: Re: [PATCH v3 0/2] perf tests: Check for ARM [vectors] page

Hello,

On Thu, Dec 20, 2018 at 07:43:35PM -0800, Florian Fainelli wrote:
> Hi all,
> 
> I just painfully learned that perf would segfault when
> CONFIG_KUSER_HELPERS is disabled because it unconditionally makes use of

Could you please elaborate?

Thanks,
Namhyung


> it. This patch series adds an ARM test for that by leveraging the
> existing find_vdso_map() function and making it more generic and capable
> of location any map within /proc/self/maps.
> 
> Changes in v3:
> 
> - remove find_vdso_map() call find_map() with VDSO__MAP_NAME
> 
> Changes in v2:
> 
> - use strlen() instead of sizeof() -1 since we made the page name a
>   parameter
> - use TEST_OK/TEST_FAIL in lieu of 0/-1
> - added an error message indicating CONFIG_KUSER_HELPERS might be
>   disabled
> 
> Florian Fainelli (2):
>   perf tools: Make find_vdso_map() more modular
>   perf tests: Add a test for the ARM 32-bit [vectors] page
> 
>  tools/perf/Makefile.perf                      |  4 ++--
>  tools/perf/arch/arm/tests/Build               |  1 +
>  tools/perf/arch/arm/tests/arch-tests.c        |  4 ++++
>  tools/perf/arch/arm/tests/vectors-page.c      | 24 +++++++++++++++++++
>  tools/perf/perf-read-vdso.c                   |  6 ++---
>  tools/perf/tests/tests.h                      |  5 ++++
>  .../perf/util/{find-vdso-map.c => find-map.c} |  7 +++---
>  tools/perf/util/vdso.c                        |  6 ++---
>  8 files changed, 45 insertions(+), 12 deletions(-)
>  create mode 100644 tools/perf/arch/arm/tests/vectors-page.c
>  rename tools/perf/util/{find-vdso-map.c => find-map.c} (71%)
> 
> -- 
> 2.17.1
>