linux-kernel - Re: [PATCH v3 04/12] Add "handle page fault" PV helper.

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Message-ID: <87ljfv4u3z.fsf@basil.nowhere.org>
Date:	Mon, 18 Jan 2010 10:53:20 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Gleb Natapov <gleb@...hat.com>, kvm@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, avi@...hat.com,
	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com, riel@...hat.com,
	cl@...ux-foundation.org
Subject: Re: [PATCH v3 04/12] Add "handle page fault" PV helper.

Peter Zijlstra <peterz@...radead.org> writes:
>
> Whatever are we doing to end up in do_page_fault() as it stands? Surely
> we can tell the CPU to go elsewhere to handle faults?
>
> Isn't that as simple as calling set_intr_gate(14, my_page_fault)
> somewhere on the cpuinit instead of the regular page_fault handler?

That typically requires ugly ifdefs in entry*S and could be described
as code obfuscation ("come from")

As long as he avoids a global reference (patch) the if should be practially
free anyways.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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