From: David Miller <davem@davemloft.net>
To: manfred@colorfullife.com
Cc: paulmck@linux.vnet.ibm.com, linux-kernel@vger.kernel.org,
wli@holomorphy.com, sparclinux@vger.kernel.org,
akpm@linux-foundation.org
Subject: Re: [PATCH] prevent sparc64 from invoking irq handlers on offline CPUs
Date: Tue, 09 Sep 2008 12:57:14 -0700 (PDT) [thread overview]
Message-ID: <20080909.125714.35737132.davem@davemloft.net> (raw)
In-Reply-To: <48C6C520.5070103@colorfullife.com>
From: Manfred Spraul <manfred@colorfullife.com>
Date: Tue, 09 Sep 2008 20:49:04 +0200
> 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.
prev parent reply other threads:[~2008-09-09 19:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-31 17:33 Paul E. McKenney
2008-09-03 0:16 ` David Miller
2008-09-03 0:42 ` Paul E. McKenney
2008-09-03 9:21 ` David Miller
2008-09-03 15:42 ` Paul E. McKenney
2008-09-09 0:17 ` David Miller
2008-09-09 14:54 ` Paul E. McKenney
2008-09-09 18:49 ` Manfred Spraul
2008-09-09 19:57 ` David Miller [this message]
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