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Subject: Re: [PATCH 04 of 32] update futex compound knowledge
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Date: Mon, 01 Mar 2010 19:07:29 +0100
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To: Andrea Arcangeli <aarcange@redhat.com>
Cc: linux-mm@kvack.org, Marcelo Tosatti <mtosatti@redhat.com>, Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>, Izik Eidus <ieidus@redhat.com>, Hugh Dickins <hugh.dickins@tiscali.co.uk>, Nick Piggin <npiggin@suse.de>, Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>, Dave Hansen <dave@linux.vnet.ibm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Ingo Molnar <mingo@elte.hu>, Mike Travis <travis@sgi.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Christoph Lameter <cl@linux-foundation.org>, Chris Wright <chrisw@sous-sol.org>, Andrew Morton <akpm@linux-foundation.org>, bpicco@redhat.com, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Balbir Singh <balbir@linux.vnet.ibm.com>, Arnd Bergmann <arnd@arndb.de>
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On Mon, 2010-03-01 at 18:58 +0100, Andrea Arcangeli wrote:
> 
> But nothing risks to break at build time, simply any arch with
> transparent hugepage support also has to implement
> __get_user_pages_fast. Disabling irq and using __get_user_pages_fast
> looked the best way to serialize against split_huge_page here (rather
> than taking locks). 

PowerPC uses rcu-free'd pagetables for gup_fast() iirc, so no need to
disable IRQs there.

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