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

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>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a54a9a2e36f3..8de5f9ff4ade 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -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