linux-kernel - Re: [PATCH RESEND v2] bus: ARM CCN PMU driver

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Date:	Wed, 23 Jul 2014 23:29:33 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Pawel Moll <pawel.moll@....com>
Cc:	Olof Johansson <olof@...om.net>, Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	arm@...nel.org
Subject: Re: [PATCH RESEND v2] bus: ARM CCN PMU driver

On Wednesday 23 July 2014 22:23:38 Arnd Bergmann wrote:
> On Tuesday 22 July 2014, Pawel Moll wrote:
> > Driver providing perf backend for ARM Cache Coherent Network
> > interconnect. Supports counting all hardware events and crosspoint
> > watchpoints.
> > 
> > Currently works with CCN-504 only, although there should be
> > no changes required for CCN-508 (just impossible to test it now).
> > 
> > Signed-off-by: Pawel Moll <pawel.moll@....com>
> 
> Applied to next/drivers, thanks!

I'm getting build errors with CONFIG_PERF_EVENTS disabled. 
Is the patch below the right answer, or should we still load
the driver and #ifdef the perf-events code?

It seems to me that the driver doesn't do anything besides
perf events, but I could be missing something.

	Arnd

diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index 5c0c2764839f..603eb1be4f6a 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -53,6 +53,7 @@ config ARM_CCI
 config ARM_CCN
 	bool "ARM CCN driver support"
 	depends on ARM || ARM64
+	depends on PERF_EVENTS
 	help
 	  PMU (perf) driver supporting the ARM CCN (Cache Coherent Network)
 	  interconnect.

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