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    SubjectRe: [PATCH v3 04/20] lockdep: Add preemption enabled/disabled assertion APIs
    On 2020-07-06 22:50:04 [+0200], Peter Zijlstra wrote:
    > On Tue, Jun 30, 2020 at 07:44:36AM +0200, Ahmed S. Darwish wrote:
    > > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
    > > index d74ac0fd6b2d..e5e2e632b749 100644
    > > --- a/lib/Kconfig.debug
    > > +++ b/lib/Kconfig.debug
    > > @@ -1118,6 +1118,7 @@ config PROVE_LOCKING
    > > select DEBUG_RWSEMS
    > > select DEBUG_WW_MUTEX_SLOWPATH
    > > select DEBUG_LOCK_ALLOC
    > > + select PREEMPT_COUNT if !ARCH_NO_PREEMPT
    > > select TRACE_IRQFLAGS
    > > default n
    > > help
    >
    > I suspect this can be done unconditional, the thing that requires arch
    > support is CONFIG_PREEMPTION.

    |$ git grep -C 2 PREEMPT_COUNT lib/Kconfig.debug
    |lib/Kconfig.debug-config DEBUG_ATOMIC_SLEEP
    |lib/Kconfig.debug- bool "Sleep inside atomic section checking"
    |lib/Kconfig.debug: select PREEMPT_COUNT
    |lib/Kconfig.debug- depends on DEBUG_KERNEL
    |lib/Kconfig.debug- depends on !ARCH_NO_PREEMPT

    There will be a build fault if you force preempt_count.

    Sebastian

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