linux-kernel - Re: pte_offset_map for ppc assumes HIGHPTE

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Message-Id: <1185405015.5439.369.camel@localhost.localdomain>
Date:	Thu, 26 Jul 2007 09:10:15 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Satya <satyakiran@...il.com>
Cc:	linuxppc-dev@...abs.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: pte_offset_map for ppc assumes HIGHPTE

On Wed, 2007-07-25 at 17:16 -0500, Satya wrote:
> hello,
> The implementation of pte_offset_map() for ppc assumes that PTEs are
> kept in highmem (CONFIG_HIGHPTE). There is only one implmentation of
> pte_offset_map() as follows (include/asm-ppc/pgtable.h):
> 
> #define pte_offset_map(dir, addr)               \
>          ((pte_t *) kmap_atomic(pmd_page(*(dir)), KM_PTE0) + pte_index(addr))
> 
> Shouldn't this be made conditional according to CONFIG_HIGHPTE is
> defined or not (as implemented in include/asm-i386/pgtable.h) ?
> 
> the same goes for pte_offset_map_nested and the corresponding unmap functions.

Do we have CONFIG_HIGHMEM without CONFIG_HIGHPTE ? If yes, then indeed,
we should change that. Though I'm not sure I see the point of splitting
those 2 options.

Ben.
 

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