linux-toradex.git/include/asm-powerpc/pgtable-4k.h, branch v2.6.19.2

[PATCH] Standardize pxx_page macros

2006-09-26T15:48:51+00:00

One of the changes necessary for shared page tables is to standardize the
pxx_page macros.  pte_page and pmd_page have always returned the struct
page associated with their entry, while pte_page_kernel and pmd_page_kernel
have returned the kernel virtual address.  pud_page and pgd_page, on the
other hand, return the kernel virtual address.

Shared page tables needs pud_page and pgd_page to return the actual page
structures.  There are very few actual users of these functions, so it is
simple to standardize their usage.

Since this is basic cleanup, I am submitting these changes as a standalone
patch.  Per Hugh Dickins' comments about it, I am also changing the
pxx_page_kernel macros to pxx_page_vaddr to clarify their meaning.

Signed-off-by: Dave McCracken 
Cc: Hugh Dickins 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

powerpc: Use 64k pages without needing cache-inhibited large pages

2006-06-15T00:45:18+00:00

Some POWER5+ machines can do 64k hardware pages for normal memory but
not for cache-inhibited pages.  This patch lets us use 64k hardware
pages for most user processes on such machines (assuming the kernel
has been configured with CONFIG_PPC_64K_PAGES=y).  User processes
start out using 64k pages and get switched to 4k pages if they use any
non-cacheable mappings.

With this, we use 64k pages for the vmalloc region and 4k pages for
the imalloc region.  If anything creates a non-cacheable mapping in
the vmalloc region, the vmalloc region will get switched to 4k pages.
I don't know of any driver other than the DRM that would do this,
though, and these machines don't have AGP.

When a region gets switched from 64k pages to 4k pages, we do not have
to clear out all the 64k HPTEs from the hash table immediately.  We
use the _PAGE_COMBO bit in the Linux PTE to indicate whether the page
was hashed in as a 64k page or a set of 4k pages.  If hash_page is
trying to insert a 4k page for a Linux PTE and it sees that it has
already been inserted as a 64k page, it first invalidates the 64k HPTE
before inserting the 4k HPTE.  The hash invalidation routines also use
the _PAGE_COMBO bit, to determine whether to look for a 64k HPTE or a
set of 4k HPTEs to remove.  With those two changes, we can tolerate a
mix of 4k and 64k HPTEs in the hash table, and they will all get
removed when the address space is torn down.

Signed-off-by: Paul Mackerras

Merge ../linux-2.6

2006-03-09T03:32:05+00:00

[PATCH] powerpc: Fix incorrect pud_ERROR() message

2006-03-03T11:00:52+00:00

The powerpc pud_ERROR() function misleadingly prints a message
indicating a pmd error.  This patch fixes it.

Signed-off-by: David Gibson 
Signed-off-by: Paul Mackerras

[PATCH] powerpc: Fixup for STRICT_MM_TYPECHECKS

2006-02-24T03:05:58+00:00

Currently ARCH=powerpc will not compile when STRICT_MM_TYPECHECKS is
turned on and CONFIG_64K_PAGES is turned off.  This corrects the
problem.

Signed-off-by: David Gibson 
Signed-off-by: Paul Mackerras

powerpc: Trivially merge several headers from asm-ppc64 to asm-powerpc

2005-11-19T09:17:32+00:00

For these, I have just done the lame-o merge where the file ends up
looking like:

	#ifndef CONFIG_PPC64
	#include 
	#else
	... contents from asm-ppc64/foo.h
	#endif

so nothing has changed, really, except that we reduce include/asm-ppc64
a bit more.

Signed-off-by: Paul Mackerras