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authorNick Piggin <npiggin@kernel.dk>2011-01-07 17:49:17 +1100
committerNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:16 +1100
commitccd35fb9f4da856b105ea0f1e0cab3702e8ae6ba (patch)
treeacb71aa4ae7d1f1ed17bdd79033a6bad5e27186d /mm/slub.c
parent786a5e15b613a9cee4fc9139fc3113a5ab0fde79 (diff)
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kernel: kmem_ptr_validate considered harmful
This is a nasty and error prone API. It is no longer used, remove it. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c40
1 files changed, 0 insertions, 40 deletions
diff --git a/mm/slub.c b/mm/slub.c
index bec0e355fba..a2fe1727ed8 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1917,17 +1917,6 @@ void kmem_cache_free(struct kmem_cache *s, void *x)
}
EXPORT_SYMBOL(kmem_cache_free);
-/* Figure out on which slab page the object resides */
-static struct page *get_object_page(const void *x)
-{
- struct page *page = virt_to_head_page(x);
-
- if (!PageSlab(page))
- return NULL;
-
- return page;
-}
-
/*
* Object placement in a slab is made very easy because we always start at
* offset 0. If we tune the size of the object to the alignment then we can
@@ -2386,35 +2375,6 @@ error:
}
/*
- * Check if a given pointer is valid
- */
-int kmem_ptr_validate(struct kmem_cache *s, const void *object)
-{
- struct page *page;
-
- if (!kern_ptr_validate(object, s->size))
- return 0;
-
- page = get_object_page(object);
-
- if (!page || s != page->slab)
- /* No slab or wrong slab */
- return 0;
-
- if (!check_valid_pointer(s, page, object))
- return 0;
-
- /*
- * We could also check if the object is on the slabs freelist.
- * But this would be too expensive and it seems that the main
- * purpose of kmem_ptr_valid() is to check if the object belongs
- * to a certain slab.
- */
- return 1;
-}
-EXPORT_SYMBOL(kmem_ptr_validate);
-
-/*
* Determine the size of a slab object
*/
unsigned int kmem_cache_size(struct kmem_cache *s)