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

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Date:	Tue, 09 Sep 2008 20:49:04 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	David Miller <davem@...emloft.net>
CC:	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	wli@...omorphy.com, sparclinux@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] prevent sparc64 from invoking irq handlers on offline
 CPUs

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.

--
    Manfred

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