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[POWERPC] Don't use SLAB/SLUB for PTE pages

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The SLUB allocator relies on struct page fields first_page and slab,
overwritten by ptl when SPLIT_PTLOCK: so the SLUB allocator cannot then
be used for the lowest level of pagetable pages.  This was obstructing
SLUB on PowerPC, which uses kmem_caches for its pagetables.  So convert
its pte level to use normal gfp pages (whereas pmd, pud and 64k-page pgd
want partpages, so continue to use kmem_caches for pmd, pud and pgd).

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Hugh Dickins
2007-05-09 14:38:48 +10:00
committed by Paul Mackerras
parent f1fa74f4af
commit 517e22638c
3 changed files with 19 additions and 42 deletions
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arch/powerpc/Kconfig
-13
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@@ -120,19 +120,6 @@ config GENERIC_BUG
config SYS_SUPPORTS_APM_EMULATION
bool
#
# Powerpc uses the slab allocator to manage its ptes and the
# page structs of ptes are used for splitting the page table
# lock for configurations supporting more than SPLIT_PTLOCK_CPUS.
#
# In that special configuration the page structs of slabs are modified.
# This setting disables the selection of SLUB as a slab allocator.
#
config ARCH_USES_SLAB_PAGE_STRUCT
bool
default y
depends on SPLIT_PTLOCK_CPUS <= NR_CPUS
config DEFAULT_UIMAGE
bool
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