linux-kernel - Re: [PATCH] jump-label: initialize jump-label subsystem somewhat later

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Message-ID: <4EE8DA11.5020109@cavium.com>
Date:	Wed, 14 Dec 2011 09:17:05 -0800
From:	David Daney <david.daney@...ium.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	David Daney <ddaney.cavm@...il.com>, ralf@...ux-mips.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mips@...ux-mips.org,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	linux-kernel@...r.kernel.org, Jason Baron <jbaron@...hat.com>
Subject: Re: [PATCH] jump-label: initialize jump-label subsystem somewhat
 later

On 12/14/2011 08:51 AM, Peter Zijlstra wrote:
> On Wed, 2011-12-14 at 08:48 -0800, David Daney wrote:
>> From: David Daney<david.daney@...ium.com>
>>
>> commit 97ce2c88f9ad42e3c60a9beb9fca87abf3639faa breaks MIPS.
>>
>> The jump-lable initialization does I-Cache flushing after modifying
>> code.  On MIPS this is done by calling through the function pointer
>> flush_icache_range().  This function pointer is initialized mm_init().

Actually I misspoke, for MIPS we need jump_label_init() after 
trap_init(), not mm_init().

>>
>> As things stand, we cannot be calling jump_label_init() until after
>> mm_init() completes, so we move the call down to satisfy this
>> constraint.
>
> I'm fine as long as it stays before sched_init(), which it does. Jeremy
> is this still early enough for you?
>

Just tested a revised patch that moves it to between trap_init() and 
mm_init(), I propose that we do that instead.

New patch in a couple of minutes.

David Daney
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