From: Ingo Molnar <mingo@elte.hu>
To: Tsutomu OWA <tsutomu.owa@toshiba.co.jp>
Cc: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC] [patch 4/6 -rt] powerpc 2.6.20-rt8: fix a runtime warnings for xmon
Date: Wed, 7 Mar 2007 10:16:38 +0100 [thread overview]
Message-ID: <20070307091638.GC1783@elte.hu> (raw)
In-Reply-To: <yyi3b4h25jj.wl@toshiba.co.jp>
* Tsutomu OWA <tsutomu.owa@toshiba.co.jp> wrote:
> @@ -342,6 +342,7 @@ static int xmon_core(struct pt_regs *reg
>
> msr = mfmsr();
> mtmsr(msr & ~MSR_EE); /* disable interrupts */
> + preempt_disable();
i'm not an xmon expert, but maybe it might make more sense to first
disable preemption, then interrupts - otherwise you could be preempted
right after having disabled these interrupts (and be scheduled to
another CPU, etc.). What is the difference between local_irq_save() and
the above 'disable interrupts' sequence? If it's not the same and
xmon_core() relied on having hardirqs disabled then it might make sense
to do a local_irq_save() there, instead of a preempt_disable().
Ingo
next prev parent reply other threads:[~2007-03-07 9:16 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-07 1:34 [patch 0/6 -rt] powerpc 2.6.20-rt8: fix boot/runtime errors/warnings for PowerPC(ppc64) Tsutomu OWA
2007-03-07 1:36 ` [patch 1/6 -rt] powerpc 2.6.20-rt8: add preemption checks for NEED_RESCHED_DELAYED Tsutomu OWA
2007-03-16 19:20 ` Sergei Shtylyov
2007-03-19 0:00 ` Tsutomu OWA
2007-03-07 1:37 ` [patch 2/6 -rt] powerpc 2.6.20-rt8: to convert spinlocks to raw ones Tsutomu OWA
2007-03-07 14:38 ` Sergei Shtylyov
2007-03-07 14:43 ` Benjamin Herrenschmidt
2007-03-07 14:54 ` Sergei Shtylyov
2007-03-07 16:49 ` Paul Mackerras
2007-03-07 17:30 ` Sergei Shtylyov
2007-03-07 19:21 ` Paul Mackerras
2007-03-07 21:21 ` Sergei Shtylyov
2007-03-07 21:30 ` Paul Mackerras
2007-03-08 0:43 ` Bill Huey
2007-03-08 3:26 ` Paul Mackerras
2007-03-08 4:00 ` Bill Huey
2007-03-07 1:39 ` [patch 3/6 -rt] powerpc 2.6.20-rt8: fix a runtime warning for smp_processor_id() Tsutomu OWA
2007-03-07 1:42 ` [RFC] [patch 4/6 -rt] powerpc 2.6.20-rt8: fix a runtime warnings for xmon Tsutomu OWA
2007-03-07 9:16 ` Ingo Molnar [this message]
2007-03-07 10:10 ` Benjamin Herrenschmidt
2007-03-07 10:54 ` Tsutomu OWA
2007-03-07 11:06 ` Arnd Bergmann
2007-03-07 1:45 ` [RFC] [patch 5/6] powerpc 2.6.20-rt8: fix a boot error for handle_percpu_irq Tsutomu OWA
2007-03-07 21:29 ` Sergei Shtylyov
2007-03-07 1:47 ` [patch 6/6 -rt] powerpc 2.6.20-rt8: fix boot/runtime errors/warnings Tsutomu OWA
2007-03-07 9:13 ` [patch 0/6 -rt] powerpc 2.6.20-rt8: fix boot/runtime errors/warnings for PowerPC(ppc64) Ingo Molnar
2007-03-07 14:26 ` Sergei Shtylyov
2007-03-08 2:28 ` Tsutomu OWA
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