linux-kernel - RE: [PATCH 0/5] Generic smp_call_function(), improvements, and smp_call_function

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Message-ID: <1FE6DD409037234FAB833C420AA843ECE1387F@orsmsx424.amr.corp.intel.com>
Date:	Fri, 21 Mar 2008 11:56:42 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Jens Axboe" <jens.axboe@...cle.com>
Cc:	<linux-kernel@...r.kernel.org>, <npiggin@...e.de>,
	<paulus@...ba.org>, <tglx@...utronix.de>, <mingo@...hat.com>
Subject: RE: [PATCH 0/5] Generic smp_call_function(), improvements, and smp_call_function_single()

> My thinking was that it may need a bit of help to ensure that the init
> function for single call data works,

The problem may be worse than that.  I see that you have a per-cpu
"call_single_queue" on which you do some list operations.  On ia64
the per-cpu variables live at the same virtual address on each processor
with a per-cpu TLB mapping directing them to a different physical
address on each.  This makes Linux lists very confused.

-Tony
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