SLUB: i386 support

SLUB cannot run on i386 at this point because i386 uses the page->private and
page->index field of slab pages for the pgd cache.

Make SLUB run on i386 by replacing the pgd slab cache with a quicklist.
Limit the changes as much as possible. Leave the improvised linked list in place
etc etc. This has been working here for a couple of weeks now.

Acked-by: William Lee Irwin III <wli@holomorphy.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 7 deletions

diff --git a/arch/i386/mm/init.c b/arch/i386/mm/init.c
index c50782efa5c..b22ce8d6b1b 100644
--- a/arch/i386/mm/init.c
+++ b/arch/i386/mm/init.c
@@ -740,7 +740,6 @@ int remove_memory(u64 start, u64 size)
 EXPORT_SYMBOL_GPL(remove_memory);
 #endif
 
-struct kmem_cache *pgd_cache;
 struct kmem_cache *pmd_cache;
 
 void __init pgtable_cache_init(void)
@@ -764,12 +763,6 @@ void __init pgtable_cache_init(void)
                         pgd_size = PAGE_SIZE;
                 }
         }
-        pgd_cache = kmem_cache_create("pgd",
-                                pgd_size,
-                                pgd_size,
-                                SLAB_PANIC,
-                                pgd_ctor,
-                                (!SHARED_KERNEL_PMD) ? pgd_dtor : NULL);
 }
 
 /*