* Benjamin Herrenschmidt <b...@kernel.crashing.org> [2010-07-23 15:11:00]:
> On Fri, 2010-07-23 at 10:38 +0530, Vaidyanathan Srinivasan wrote: > > Yes. extended_cede_processor() will return with interrupts enabled in > > the cpu. (This is done by the hypervisor). Under normal cases we > > cannot be interrupted because no IO interrupts are routed to us after > > xics_teardown_cpu() and since the CPU is out of the map, nobody will > > send us IPIs. > > What about decrementer ? Decrementer expiry event handling is bit complex. The event as such may not bring back the extended_cede_processor() cpu, but may be marked pending when we get out of this state eventually. I will find more information on this event and update. > > Though H_CEDE will return with interrupts enabled, it is unlikely that > > an interrupt can be delivered in this context. > > Well, if interrupts are soft-disabled, even if one occurs, we will just > mask and return, so that at least should be ok. Yes. We will immediately return to the extended_cede_processor() in the while loop until the preferred_offline_state is changed. --Vaidy _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
