From: ebiederm@xmission.com (Eric W. Biederman)
To: Ingo Molnar <mingo@elte.hu>
Cc: Yinghai Lu <yinghai@kernel.org>,
mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org,
tglx@linutronix.de, linux-tip-commits@vger.kernel.org
Subject: Re: [tip:x86/irq] x86: apic: Fix mismerge, add arch_probe_nr_irqs() again
Date: Sat, 27 Feb 2010 02:12:34 -0800 [thread overview]
Message-ID: <m1zl2voulp.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <20100227095313.GG31794@elte.hu> (Ingo Molnar's message of "Sat\, 27 Feb 2010 10\:53\:13 +0100")
Ingo Molnar <mingo@elte.hu> writes:
>> Ingo do you have any idea what NR_IRQS or nr_irqs were/are on
>> that failing machine?
>
> Sorry, not - and the merge window doesnt leave much time to revisit the
> problem right now.
>
> But the failures were very real and 100% caused by this: they resulted in
> non-existent /dev/sda* nodes and resulting fsck failure by rc.
I have looked it over a second time and I have convinced myself
that arch_probe_nr_irqs will in the worst case reduce nr_irqs,
and never increase it beyond NR_IRQS. So this revert (keeping
arch_probe_nr_irqs) is safe.
It makes little sense that a larger nr_irqs would be a problem,
but clearly there are assumptions somewhere that we still need
to remove.
Eric
next prev parent reply other threads:[~2010-02-27 10:12 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-03 3:31 x86: fix race in create_irq_nr on irq_desc Brandon Philips
2010-02-03 10:20 ` Yinghai Lu
2010-02-03 17:42 ` Brandon Philips
2010-02-03 19:31 ` Yinghai Lu
2010-02-04 3:17 ` Brandon Philips
2010-02-05 8:45 ` [PATCH] x86: keep chip_data in create_irq_nr Yinghai Lu
2010-02-05 21:05 ` Brandon Philips
2010-02-05 21:42 ` H. Peter Anvin
2010-02-05 21:09 ` [PATCH] x86: keep chip_data in create_irq_nr and destroy_irq Brandon Philips
2010-02-05 22:44 ` Yinghai Lu
2010-02-05 22:55 ` Brandon Philips
2010-02-06 0:06 ` Yinghai Lu
2010-02-06 0:18 ` [PATCH v2] " Brandon Philips
2010-02-06 6:42 ` [PATCH v3] " Brandon Philips
2010-02-06 7:16 ` Yinghai Lu
2010-02-06 20:05 ` Brandon Philips
2010-02-07 21:02 ` [PATCH v4] " Brandon Philips
2010-02-19 6:06 ` [tip:x86/urgent] x86, irq: Keep " tip-bot for Brandon Philips
2010-02-26 10:26 ` [tip:x86/irq] x86: apic: Fix mismerge, add arch_probe_nr_irqs() again tip-bot for Ingo Molnar
2010-02-26 18:19 ` Yinghai Lu
2010-02-27 9:10 ` Ingo Molnar
2010-02-27 9:37 ` Eric W. Biederman
2010-02-27 9:53 ` Ingo Molnar
2010-02-27 10:12 ` Eric W. Biederman [this message]
2010-03-01 11:22 ` Ian Campbell
2010-03-01 18:34 ` Eric W. Biederman
2010-03-01 21:44 ` Ian Campbell
2010-03-01 21:58 ` Eric W. Biederman
2010-03-02 8:31 ` Thomas Gleixner
2010-03-10 10:55 ` Ian Campbell
2010-03-10 10:55 ` [PATCH] x86: namespace some I/O APIC related structures and functions ijc
2010-03-10 17:07 ` Eric W. Biederman
2010-03-10 10:55 ` [PATCH] irq: move some interrupt arch_* functions into struct irq_chip ijc
2010-03-10 11:00 ` Ian Campbell
2010-03-10 17:18 ` Eric W. Biederman
2010-03-10 17:41 ` Ian Campbell
2010-03-10 18:11 ` Eric W. Biederman
2010-03-10 12:06 ` Yinghai Lu
2010-03-10 12:51 ` Ian Campbell
2010-03-10 17:42 ` Eric W. Biederman
2010-03-10 17:50 ` Ian Campbell
2010-03-10 18:15 ` Eric W. Biederman
2010-03-10 18:28 ` Ian Campbell
2010-03-10 18:27 ` Jeremy Fitzhardinge
2010-03-10 18:59 ` Yinghai Lu
2010-03-10 19:15 ` Eric W. Biederman
2010-03-10 22:07 ` Michael Ellerman
2010-03-10 10:55 ` [PATCH] x86: irq_desc->chip_data is always correct whether or not SPARSE_IRQ is enabled ijc
2010-03-01 22:01 ` [tip:x86/irq] x86: apic: Fix mismerge, add arch_probe_nr_irqs() again Jeremy Fitzhardinge
2010-02-27 12:57 ` [tip:x86/apic] " tip-bot for Ingo Molnar
2010-02-03 10:32 ` x86: fix race in create_irq_nr on irq_desc Yinghai Lu
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