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Subject: Re: [PATCH] [POWERPC] Free a PTE bit on ppc64 with 64K pages
From: Michael Ellerman <michael@ellerman.id.au>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Date: Tue, 10 Jun 2008 14:00:51 +1000
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Cc: linuxppc-dev@ozlabs.org, Paul Mackerras <paulus@samba.org>
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On Thu, 2008-05-29 at 15:51 +1000, Benjamin Herrenschmidt wrote:
> This patch frees a PTE bit when using 64K pages on ppc64. This is done
> by getting rid of the separate _PAGE_HASHPTE bit. Instead, we just test
> if any of the 16 sub-page bits is set. For non-combo pages (ie. real
> 64K pages), we set SUB0 and the location encoding in that field.
>=20
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> ---
>=20
> Please review and make sure I didn't miss something ...=20

This doesn't build for CONFIG_PPC_64K_PAGES=3Dn and
CONFIG_PPC_HAS_HASH_64K=3Dy, because the asm is protected by the latter
but the header definitions are protected by the former.

cheers

--=20
Michael Ellerman
OzLabs, IBM Australia Development Lab

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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