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authorFrederic Weisbecker <fweisbec@gmail.com>2010-05-15 23:15:20 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2010-05-16 01:57:42 +0200
commit23637d477c1f53acbb176a02c241d60a25888fae (patch)
tree6d2e9e4a9f6fa2428e0ace29cf764212b823598a /arch/Kconfig
parentc01d4323309a90a298fd81cf3a059ee1b12be2e9 (diff)
downloadlwn-23637d477c1f53acbb176a02c241d60a25888fae.tar.gz
lwn-23637d477c1f53acbb176a02c241d60a25888fae.zip
lockup_detector: Introduce CONFIG_HARDLOCKUP_DETECTOR
This new config is deemed to simplify even more the lockup detector dependencies and can make it easier to bring a smooth sorting between archs that support the new generic lockup detector and those that still have their own, especially for those that are in the middle of this migration. Instead of checking whether we have CONFIG_LOCKUP_DETECTOR + CONFIG_PERF_EVENTS_NMI each time an arch wants to know if it needs to build its own lockup detector, take a shortcut with this new config. It is enabled only if the hardlockup detection part of the whole lockup detector is on. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Don Zickus <dzickus@redhat.com> Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Diffstat (limited to 'arch/Kconfig')
-rw-r--r--arch/Kconfig4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index 89b0efb50948..35084f280087 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -147,5 +147,9 @@ config HAVE_USER_RETURN_NOTIFIER
config HAVE_PERF_EVENTS_NMI
bool
+ help
+ System hardware can generate an NMI using the perf event
+ subsystem. Also has support for calculating CPU cycle events
+ to determine how many clock cycles in a given period.
source "kernel/gcov/Kconfig"