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From: Andrew Lunn <andrew@lunn.ch>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org,
	Ravi Bangoria <ravi.bangoria@linux.ibm.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Kim Phillips <kim.phillips@arm.com>,
	Thomas Richter <tmricht@linux.ibm.com>,
	open list <linux-kernel@vger.kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	rmk+kernel@armlinux.org.uk, Ingo Molnar <mingo@redhat.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Jiri Olsa <jolsa@redhat.com>,
	l.stach@pengutronix.de
Subject: Re: [PATCH 2/2] perf tests: Add a test for the ARM 32-bit [vectors] page
Date: Thu, 25 Oct 2018 04:10:13 +0200	[thread overview]
Message-ID: <20181025021013.GA30116@lunn.ch> (raw)
In-Reply-To: <20181025000905.6095-3-f.fainelli@gmail.com>

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

  reply	other threads:[~2018-10-25  2:11 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-25  0:09 [PATCH 0/2] perf tests: Check for ARM " Florian Fainelli
2018-10-25  0:09 ` [PATCH 1/2] perf tools: Make find_vdso_map() more modular Florian Fainelli
2018-10-25  0:14   ` Florian Fainelli
2018-10-25  0:09 ` [PATCH 2/2] perf tests: Add a test for the ARM 32-bit [vectors] page Florian Fainelli
2018-10-25  2:10   ` Andrew Lunn [this message]
2018-10-25 17:19     ` Florian Fainelli
2018-10-25 17:32       ` Russell King - ARM Linux
2018-10-25 17:53         ` Florian Fainelli
2018-10-25 18:03           ` Russell King - ARM Linux
2018-10-31 22:21 ` [PATCH 0/2] perf tests: Check for ARM " Florian Fainelli

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