linux-kernel - Re: [PATCH v2 0/2] perf tests: Check for ARM [vectors] page

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Date:   Mon, 26 Nov 2018 16:27:43 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-kernel@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        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
Subject: Re: [PATCH v2 0/2] perf tests: Check for ARM [vectors] page

On 11/13/18 2:44 PM, Florian Fainelli wrote:
> On 10/25/18 10:55 AM, 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
>> 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.
> 
> Did not get much feedback, you are all probably busy attending LPC
> conferences, but I was wondering if this did make sense or if there is a
> better approach that should be looked at?
> 
> I am starting to see additional tests failing that require some ARM
> (32-bit) specific changes, and not accumulating too many of these fixes
> on top of that series would be neat.
> 
> Thank you!

Ping? Would you prefer a resend to avoid any possible conflicts? Thanks

> 
>>
>> 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/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/tests/tests.h                 |  5 ++++
>>  tools/perf/util/find-map.c               | 31 ++++++++++++++++++++++++
>>  tools/perf/util/find-vdso-map.c          | 30 +++--------------------
>>  6 files changed, 68 insertions(+), 27 deletions(-)
>>  create mode 100644 tools/perf/arch/arm/tests/vectors-page.c
>>  create mode 100644 tools/perf/util/find-map.c
>>
> 
> 


-- 
Florian