Re: [PATCH] prevent sparc64 from invoking irq handlers on offline CPUs

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From: David Miller

Subject: Re: [PATCH] prevent sparc64 from invoking irq handlers on offline CPUs

Date: Tuesday, September 9, 2008 - 12:57 pm

From: Manfred Spraul <manfred@colorfullife.com>
Date: Tue, 09 Sep 2008 20:49:04 +0200

quoted text> David Miller wrote:
> > And IPI handler runs in HW irq context, therefore such an IPI-creates-an-IPI
> > should not be allowed, at least not directly.
> >
> > Actually the restriction seems to be that an IPI cannot be sent when
> > "irqs_disabled()", hmmm...
> >
> >   
> Does this apply to smp_send_reschedule() as well?
> A [rare] codepath in the current rcu code does to trigger quiescent states on remote cpus.

It does work on sparc64.  Such an IPI doesn't do a wait so there would
be no deadlock issues either.

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Messages in current thread:

[PATCH] prevent sparc64 from invoking irq handlers on offl ..., Paul E. McKenney, (Sun Aug 31, 10:33 am)

Re: [PATCH] prevent sparc64 from invoking irq handlers on ..., David Miller, (Tue Sep 2, 5:16 pm)

Re: [PATCH] prevent sparc64 from invoking irq handlers on ..., Paul E. McKenney, (Tue Sep 2, 5:42 pm)

Re: [PATCH] prevent sparc64 from invoking irq handlers on ..., David Miller, (Wed Sep 3, 2:21 am)

Re: [PATCH] prevent sparc64 from invoking irq handlers on ..., Paul E. McKenney, (Wed Sep 3, 8:42 am)

Re: [PATCH] prevent sparc64 from invoking irq handlers on ..., David Miller, (Mon Sep 8, 5:17 pm)

Re: [PATCH] prevent sparc64 from invoking irq handlers on ..., Paul E. McKenney, (Tue Sep 9, 7:54 am)

Re: [PATCH] prevent sparc64 from invoking irq handlers on ..., Manfred Spraul, (Tue Sep 9, 11:49 am)

Re: [PATCH] prevent sparc64 from invoking irq handlers on ..., David Miller, (Tue Sep 9, 12:57 pm)


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