Commit:     30520864839dc796fd314812e7036e754880b47d
Parent:     614410d5892af5f86d0ec14e28f9f6d5f4ac9e9b
Author:     Christoph Lameter <[EMAIL PROTECTED]>
AuthorDate: Sun May 6 14:49:38 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Mon May 7 12:12:53 2007 -0700

    PowerPC: Disable SLUB for configurations in which slab page structs are 
    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 <[EMAIL PROTECTED]>
    Cc: Hugh Dickins <[EMAIL PROTECTED]>
    Cc: Paul Mackerras <[EMAIL PROTECTED]>
    Acked-by: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
 arch/powerpc/Kconfig |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a54a9a2..8de5f9f 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.
+       bool
+       default y
+       depends on SPLIT_PTLOCK_CPUS <= NR_CPUS
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