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From: Grant Grundler <grundler@parisc-linux.org>
To: parisc-linux@lists.parisc-linux.org
Subject: [parisc-linux] init_idle and local_irq_save
Date: Mon, 29 Mar 2004 09:03:57 -0700	[thread overview]
Message-ID: <20040329160357.GA31448@colo.lackof.org> (raw)

Hi all,
I'm trying to get 2.6 SMP working on a UP box and was walking
through the init sequence. I have two questions related to init_idle()
in kernel/sched.c:

o local_irq_save()/local_irq_restore are called without an
  obvious local_irq_disable() call in between. Is this really
  needed for some other reason or is the local_irq_disable() missing?

o double_rq_lock() acquires the locks with lowest address first.
  double_rq_unlock() does not release those in the inverse order.
  Is that a problem?
  I'm just nervous since I didn't see the local_irq_disable()
  in init_idle() which would guarantee both unlock's happen atomically.

thanks,
grant

             reply	other threads:[~2004-03-29 16:03 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-03-29 16:03 Grant Grundler [this message]
2004-03-29 16:17 ` [parisc-linux] init_idle and local_irq_save James Bottomley
2004-03-29 16:31 ` Matthew Wilcox

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