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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2009-08-13 20:38:17 +0200
committerUwe Kleine-König <u.kleine-koenig@pengutronix.de>2009-08-13 20:34:38 +0200
commitd45a398fca6b03f16d01c9253c3a8c96d804f532 (patch)
treedc8b7971555641c94910e2fb9d5266597616213d /arch/arm/Kconfig
parent0d928b0b616d1c5c5fe76019a87cba171ca91633 (diff)
Use kernel/Kconfig.preempt for ARM
before this patch ARM had it's own definition of CONFIG_PREEMPT. Instead of that use the general definition provided in kernel/Kconfig.preempt. This patch changes the available options in *config. Namely PREEMPT isn't a stand alone bool anymore, but part of a 'choice' the following Kconfig symbols are added: PREEMPT_NONE PREEMPT_VOLUNTARY Selecting PREEMPT_NONE now produces exactly the code as not selecting PREEMPT before (apart from a comment in /sys/kernel/debug/tracing/(per_cpu/cpuX/)?trace). The only difference PREEMPT_VOLUNTARY does is that might_resched might reschedule. Both should't introduce regressions. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Russell King <linux@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/Kconfig')
-rw-r--r--arch/arm/Kconfig13
1 files changed, 1 insertions, 12 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index aef63c8e3d2..eac1a927ca6 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -962,18 +962,7 @@ config LOCAL_TIMERS
accounting to be spread across the timer interval, preventing a
"thundering herd" at every timer tick.
-config PREEMPT
- bool "Preemptible Kernel (EXPERIMENTAL)"
- depends on EXPERIMENTAL
- help
- This option reduces the latency of the kernel when reacting to
- real-time or interactive events by allowing a low priority process to
- be preempted even if it is in kernel mode executing a system call.
- This allows applications to run more reliably even when the system is
- under load.
-
- Say Y here if you are building a kernel for a desktop, embedded
- or real-time system. Say N if you are unsure.
+source kernel/Kconfig.preempt
config HZ
int