Messages in this thread |  | | Date | Wed, 19 Aug 2020 17:32:50 +0200 | From | peterz@infradea ... | Subject | Re: [PATCH 1/2] lockdep: improve current->(hard|soft)irqs_enabled synchronisation with actual irq state |
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On Wed, Aug 19, 2020 at 08:39:13PM +1000, Alexey Kardashevskiy wrote:
> > or current upstream? > > The upstream 18445bf405cb (13 hours old) also shows the problem. Yours > 1/2 still fixes it.
Afaict that just reduces the window.
Isn't the problem that:
arch/powerpc/kernel/exceptions-64e.S
START_EXCEPTION(perfmon); NORMAL_EXCEPTION_PROLOG(0x260, BOOKE_INTERRUPT_PERFORMANCE_MONITOR, PROLOG_ADDITION_NONE) EXCEPTION_COMMON(0x260) INTS_DISABLE # RECONCILE_IRQ_STATE # TRACE_DISABLE_INTS # TRACE_WITH_FRAME_BUFFER(trace_hardirqs_off) # # but we haven't done nmi_enter() yet... whoopsy
CHECK_NAPPING() addi r3,r1,STACK_FRAME_OVERHEAD bl performance_monitor_exception # perf_irq() # perf_event_interrupt # __perf_event_interrupt # nmi_enter()
That is, afaict your entry code is buggered.
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