linux-kernel - Re: [patch 7/7] powerpc: lockless get_user_pages

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Message-Id: <20080609013204.7c291b68.akpm@linux-foundation.org>
Date:	Mon, 9 Jun 2008 01:32:04 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	npiggin@...e.de
Cc:	torvalds@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
	paulus@...ba.org
Subject: Re: [patch 7/7] powerpc: lockless get_user_pages_fast

On Thu, 05 Jun 2008 19:43:07 +1000 npiggin@...e.de wrote:

> Implement lockless get_user_pages_fast for powerpc. Page table existence is
> guaranteed with RCU, and speculative page references are used to take a
> reference to the pages without having a prior existence guarantee on them.
> 

arch/powerpc/mm/gup.c: In function `get_user_pages_fast':
arch/powerpc/mm/gup.c:156: error: `SLICE_LOW_TOP' undeclared (first use in this function)
arch/powerpc/mm/gup.c:156: error: (Each undeclared identifier is reported only once
arch/powerpc/mm/gup.c:156: error: for each function it appears in.)
arch/powerpc/mm/gup.c:178: error: implicit declaration of function `get_slice_psize'
arch/powerpc/mm/gup.c:178: error: `mmu_huge_psize' undeclared (first use in this function)
arch/powerpc/mm/gup.c:182: error: implicit declaration of function `huge_pte_offset'
arch/powerpc/mm/gup.c:182: warning: assignment makes pointer from integer without a cast

with

http://userweb.kernel.org/~akpm/config-g5.txt

I don't immediately know why - adding asm/page.h to gup.c doesn't help.
I'm suspecting a recursive include problem somewhere.

I'll drop it, sorry - too much other stuff to fix over here.
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