[PATCH] vmalloc: optimization, cleanup, bugfixes

- reorder 'struct vm_struct' to speedup lookups on CPUS with small cache
  lines.  The fields 'next,addr,size' should be now in the same cache line,
  to speedup lookups.

- One minor cleanup in __get_vm_area_node()

- Bugfixes in vmalloc_user() and vmalloc_32_user() NULL returns from
  __vmalloc() and __find_vm_area() were not tested.

[akpm@osdl.org: remove redundant BUG_ONs]
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index dc9a29d84ab..924e502905d 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -23,13 +23,14 @@ struct vm_area_struct;
 #endif
 
 struct vm_struct {
+        /* keep next,addr,size together to speedup lookups */
+        struct vm_struct        *next;
         void                    *addr;
         unsigned long           size;
         unsigned long           flags;
         struct page             **pages;
         unsigned int            nr_pages;
         unsigned long           phys_addr;
-        struct vm_struct        *next;
 };
 
 /*