sched: Make sleeping inside spinlock detection working in !CONFIG_PRE…

…EMPT 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 <[email protected]> Acked-by: Paul E. McKenney <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Peter Zijlstra <[email protected]>
cbmeeks · Jun 10, 2011 · e8f7c70 · e8f7c70
1 parent bdd4e85
commit e8f7c70
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
@@ -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