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From: William Lee Irwin III <>
To: Andi Kleen <>
Cc: Mikael Pettersson <>,
Subject: Re: [BUG][2.6.0-test3-bk7] x86-64 UP_IOAPIC panic caused by cpumask_t conversion
Date: Tue, 19 Aug 2003 16:51:26 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Mikael Pettersson <> writes:
> Nasty.
> But why does i386/UP work?

On Wed, Aug 20, 2003 at 01:39:10AM +0200, Andi Kleen wrote:
> > (I believe this is the correct thing to do, except having
> > CONFIG_X86_IO_APIC in generic code isn't quite right.)
> Better would be to undo the cpumask_t changes in io_apic.c
> and go back to unsigned long masks there again.
> Obviously a cpu mask is not the right data structure to manage APICs
> Another way would be to do whatever i386 does to avoid the problem.
> The IO-APIC code is unfortunately quite out of date/unsynced compared to i386,
> maybe it just needs some bug fix ported over. I will check that later.

Odd; I have a UP IO-APIC ia32 box here and it appears to do okay; there
is a question of sparse APIC ID's and APIC ID space needing to be
independent of NR_CPUS handled in the ia32 code that isn't handled in
the x86_64 code. It was handled for ia32 by using a bitmap of size
MAX_APICS (physid_mask_t) instead of cpumask_t for the things, which
appears to eliminate various special cases for xAPIC's too.

-- wli

  reply	other threads:[~2003-08-19 23:50 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
2003-08-19 23:39 ` Andi Kleen
2003-08-19 23:51   ` William Lee Irwin III [this message]
2003-08-19 23:57     ` Andi Kleen
2003-08-20  0:39       ` [PATCH] physid_maskt for x86-64 was R[BUG][2.6.0-test3-bk7] " Andi Kleen
2003-08-19 22:57 [BUG][2.6.0-test3-bk7] " Mikael Pettersson

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