Subject: Re: [PATCH 1/2] Export get_user_pages_fast
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reply-To: benh@kernel.crashing.org
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andrew Morton <akpm@linux-foundation.org>, Avi Kivity <avi@qumranet.com>,
       Adrian Bunk <bunk@kernel.org>, Rusty Russell <rusty@rustcorp.com.au>,
       lguest <lguest@ozlabs.org>, linux-kernel@vger.kernel.org
In-Reply-To: <200807311848.13142.nickpiggin@yahoo.com.au>
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	 <200807311810.57821.nickpiggin@yahoo.com.au>
	 <20080731012151.41733ef6.akpm@linux-foundation.org>
	 <200807311848.13142.nickpiggin@yahoo.com.au>
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Date: Thu, 31 Jul 2008 18:52:23 +1000
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On Thu, 2008-07-31 at 18:48 +1000, Nick Piggin wrote:
> > If we do this then corresponding changes should be made to the powerpc
> > patch upon which Ben presently sits.
> 
> Powerpc will still use the CONFIG symbol for the moment because 32-bit TLB
> flushing has not been verified to work, so we don't want to pull in the
> 64-bit gup. There is some discussion going on, but they probably need at
> least to implement pte_special, and then also do RCU freeing of page tables.

It's just a matter of building gup.c or not .. as long as it's
in the makefile as obj-$(CONFIG_PPC64) (as I put it in the merged
version of the patch), the weak symbol should work.

Ben.


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