linux-kernel - Re: [PATCH 2/2] perf tests: Add a test for the ARM 32-bit [vectors] page

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Message-ID: <20181025021013.GA30116@lunn.ch>
Date:   Thu, 25 Oct 2018 04:10:13 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Kim Phillips <kim.phillips@....com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        open list <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        rmk+kernel@...linux.org.uk, Ingo Molnar <mingo@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jiri Olsa <jolsa@...hat.com>, l.stach@...gutronix.de
Subject: Re: [PATCH 2/2] perf tests: Add a test for the ARM 32-bit [vectors]
 page

On Wed, Oct 24, 2018 at 05:09:05PM -0700, Florian Fainelli wrote:
> perf on ARM requires CONFIG_KUSER_HELPERS to be turned on to allow some
> independance with respect to the ARM CPU being used. Add a test which
> tries to locate the [vectors] page, created when CONFIG_KUSER_HELPERS is
> turned on to help asses the system's health.

Hi Florian

I've suffered the pain from missing CONFIG_KUSER_HELPERS. The
segfaults give little clue as to what is going wrong,and gdb is not
much use either.

What i don't see here is any clue to CONFIG_KUSER_HELPERS. If the test
fails, could you print a message suggesting CONFIG_KUSER_HELPERS on
ARM?

	Andrew