Messages in this thread | | | Date | Mon, 27 Apr 2020 18:54:10 +0300 | From | Leon Romanovsky <> | Subject | Re: [PATCH] x86/apic: Fix circular locking dependency between console and hrtimer locks |
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On Mon, Apr 27, 2020 at 05:31:21PM +0200, Thomas Gleixner wrote: > Leon Romanovsky <leon@kernel.org> writes: > > OK, I consulted with verification people and back then the trigger was: > > Reproduce when run "echo 1 > /sys/kernel/debug/clear_warn_once" after > > reboot > > That explains it. > > > [ 0.937310] Freeing SMP alternatives memory: 32K > > [ 0.940471] TSC deadline timer enabled > > So here is the first one which sets 'once'. Of course if you clear 'once' > afterwards then this triggers because the context is completely > different. > > So the right thing to do is to move this out of __setup_APIC_LVTT() and > be done with it.
Thanks a lot.
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