Messages in this thread | | | Date | Wed, 22 Oct 2008 23:35:40 -0400 | From | Aristeu Rozanski <> | Subject | Re: [RFC][PATCH] nmi watchdog: handle NMI_IO_APIC on nmi_watchdog |
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> > > but this stops all NMIs, not just the IO-APIC generated ones, doesnt it? > > external NMIs would come by LINT1, no? > > Correct. > > > after reading a lot and talking with Vivek, what I understood was that 8259 is > > also connected to LINT0, so timer interrupts would be reported both in > > IOAPIC and on LINT0. LVT0 is being configured on setup_nmi() to generate > > an NMI. Also, the same timer interrupt would generate an regular interrupt > > coming from IOAPIC. Clearing the APIC_DM_NMI on LVT0 would disable the > > NMI delivery, but not the regular interrupt. > > or am I missing something here? > > You are correct. The routing of the 8254 timer interrupt may vary, but > the NMI watchdog it drives, if supported, always uses the LINT0 input of > all the local APICs. thanks
> You seem to be writing in reply to a very old thread -- please make sure > your concerns are still valid with current code. For example we have an > implementation of __acpi_nmi_disable() now, which is exactly your proposed > one. didn't noticed that, sorry.
-- Aristeu
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