sched: Make sleeping inside spinlock detection working in !CONFIG_PREEMPT
authorFrederic Weisbecker <fweisbec@gmail.com>
Tue, 7 Jun 2011 23:51:02 +0000 (01:51 +0200)
committerFrederic Weisbecker <fweisbec@gmail.com>
Fri, 10 Jun 2011 13:16:06 +0000 (15:16 +0200)
commite8f7c70f44f75c827c04239b0ae5f0068b65b76e
treef09f5a5189833e26a0d95ff42359f19f740066df
parentbdd4e85dc36cdbcfc1608a5b2a17c80a9db8986a
sched: Make sleeping inside spinlock detection working in !CONFIG_PREEMPT

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>
lib/Kconfig.debug