linux-kernel - Re: [PATCH 1/2] Export get_user_pages

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Date:	Thu, 31 Jul 2008 18:56:39 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	benh@...nel.crashing.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Avi Kivity <avi@...ranet.com>, Adrian Bunk <bunk@...nel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	lguest <lguest@...abs.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Export get_user_pages_fast

On Thursday 31 July 2008 18:52, Benjamin Herrenschmidt wrote:
> 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.

I see. Here we are, then.

View attachment "out-of-line-gup.patch" of type "text/x-diff" (4249 bytes)