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sched: Make sleeping inside spinlock detection working in !CONFIG_PREEMPT

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Select CONFIG_PREEMPT_COUNT when we enable the sleeping inside
spinlock detection, so that the preempt offset gets correctly
incremented/decremented from preempt_disable()/preempt_enable().

This makes the preempt count eventually working in !CONFIG_PREEMPT
when that debug option is set and thus fixes the detection of explicit
preemption disabled sections under such config. Code that sleeps
in explicitly preempt disabled section can be finally spotted
in non-preemptible kernels.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
This commit is contained in:
Frederic Weisbecker 2011-06-08 01:51:02 +02:00
parent bdd4e85dc3
commit e8f7c70f44
1 changed files with 1 additions and 0 deletions
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lib/Kconfig.debug
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@ -650,6 +650,7 @@ config TRACE_IRQFLAGS
config DEBUG_SPINLOCK_SLEEP
bool "Spinlock debugging: sleep-inside-spinlock checking"
select PREEMPT_COUNT
depends on DEBUG_KERNEL
help
If you say Y here, various routines which may sleep will become very