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PowerPC: Disable SLUB for configurations in which slab page structs are modified

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PowerPC uses the slab allocator to manage the lowest level of the page
table.  In high cpu configurations we also use the page struct to split the
page table lock.  Disallow the selection of SLUB for that case.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Paul Mackerras <paulus@samba.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-05-06 14:49:38 -07:00 committed by Linus Torvalds
parent 614410d589
commit 3052086483
1 changed files with 13 additions and 0 deletions
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13
arch/powerpc/Kconfig
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@ -117,6 +117,19 @@ config GENERIC_BUG
default y
depends on BUG
#
# 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
help