sched/clock: Prevent tracing recursion in sched_clock_cpu()
Prevent tracing of preempt_disable/enable() in sched_clock_cpu(). When CONFIG_DEBUG_PREEMPT is enabled, preempt_disable/enable() are traced and this causes trace_clock() users (and probably others) to go into an infinite recursion. Systems with a stable sched_clock() are not affected. This problem is similar to that fixed by upstream commit 95ef1e52 ("KVM guest: prevent tracing recursion with kvmclock"). Signed-off-by: NFernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> Signed-off-by: NPeter Zijlstra <peterz@infradead.org> Acked-by: NSteven Rostedt <rostedt@goodmis.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1394083528.4524.3.camel@nexusSigned-off-by: NIngo Molnar <mingo@kernel.org>
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