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    Subject[PATCH 3/4] 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 <>
    Acked-by: Paul E. McKenney <>
    Cc: Ingo Molnar <>
    Cc: Peter Zijlstra <>
    lib/Kconfig.debug | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
    index 28afa4c..a7dd7b5 100644
    --- a/lib/Kconfig.debug
    +++ b/lib/Kconfig.debug
    @@ -650,6 +650,7 @@ config TRACE_IRQFLAGS

    bool "Spinlock debugging: sleep-inside-spinlock checking"
    + select PREEMPT_COUNT
    depends on DEBUG_KERNEL
    If you say Y here, various routines which may sleep will become very

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      Last update: 2011-06-10 15:33    [W:0.026 / U:7.424 seconds]
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