linux-kernel - [PATCH 2/4] lockup_detector: Adapt CONFIG_PERF_EVENT

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Date:	Sun, 16 May 2010 04:33:58 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Don Zickus <dzickus@...hat.com>,
	Cyrill Gorcunov <gorcunov@...il.com>
Subject: [PATCH 2/4] lockup_detector: Adapt CONFIG_PERF_EVENT_NMI to other archs

CONFIG_PERF_EVENT_NMI is something that need to be enabled from the
arch. This is fine on x86 as PERF_EVENTS is builtin but if other
archs select it, they will need to handle the PERF_EVENTS dependency.

Instead, handle the dependency in the generic layer:

- archs need to tell what they support through HAVE_PERF_EVENTS_NMI
- Enable magically PERF_EVENTS_NMI if we have PERF_EVENTS and
  HAVE_PERF_EVENTS_NMI.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Cyrill Gorcunov <gorcunov@...il.com>
---
 arch/Kconfig     |    3 +++
 arch/x86/Kconfig |    2 +-
 init/Kconfig     |    3 +--
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index e5eb133..89b0efb 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -145,4 +145,7 @@ config HAVE_HW_BREAKPOINT
 config HAVE_USER_RETURN_NOTIFIER
 	bool
 
+config HAVE_PERF_EVENTS_NMI
+	bool
+
 source "kernel/gcov/Kconfig"
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 3cb28cd..3cb5bb0 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -54,7 +54,7 @@ config X86
 	select HAVE_KERNEL_LZO
 	select HAVE_HW_BREAKPOINT
 	select PERF_EVENTS
-	select PERF_EVENTS_NMI
+	select HAVE_PERF_EVENTS_NMI
 	select ANON_INODES
 	select HAVE_ARCH_KMEMCHECK
 	select HAVE_USER_RETURN_NOTIFIER
diff --git a/init/Kconfig b/init/Kconfig
index e44e254..ab733c3 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -943,8 +943,7 @@ config PERF_USE_VMALLOC
 	  See tools/perf/design.txt for details
 
 config PERF_EVENTS_NMI
-	bool
-	depends on PERF_EVENTS
+	def_bool PERF_EVENTS && HAVE_PERF_EVENTS_NMI
 	help
 	  System hardware can generate an NMI using the perf event
 	  subsystem.  Also has support for calculating CPU cycle events
-- 
1.6.2.3

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