diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2009-08-13 20:38:17 +0200 |
|---|---|---|
| committer | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2009-08-13 20:34:38 +0200 |
| commit | d45a398fca6b03f16d01c9253c3a8c96d804f532 (patch) | |
| tree | dc8b7971555641c94910e2fb9d5266597616213d /arch/arm/Kconfig | |
| parent | 0d928b0b616d1c5c5fe76019a87cba171ca91633 (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/Kconfig | 13 |
1 files changed, 1 insertions, 12 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index aef63c8e3d2d..eac1a927ca6e 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 |