mm/slab: remove CONFIG_SLOB code from slab common code

CONFIG_SLOB has been removed from Kconfig. Remove code and #ifdef's
specific to SLOB in the slab headers and common code.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Acked-by: Lorenzo Stoakes <lstoakes@gmail.com>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>

1 files changed, 0 insertions, 39 deletions

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 45af70315a94..7f645a4c1298 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -298,19 +298,6 @@ static inline unsigned int arch_slab_minalign(void)
 #endif
 #endif
 
-#ifdef CONFIG_SLOB
-/*
- * SLOB passes all requests larger than one page to the page allocator.
- * No kmalloc array is necessary since objects of different sizes can
- * be allocated from the same page.
- */
-#define KMALLOC_SHIFT_HIGH	PAGE_SHIFT
-#define KMALLOC_SHIFT_MAX	(MAX_ORDER + PAGE_SHIFT - 1)
-#ifndef KMALLOC_SHIFT_LOW
-#define KMALLOC_SHIFT_LOW	3
-#endif
-#endif
-
 /* Maximum allocatable size */
 #define KMALLOC_MAX_SIZE	(1UL << KMALLOC_SHIFT_MAX)
 /* Maximum size for which we actually use a slab cache */
@@ -366,7 +353,6 @@ enum kmalloc_cache_type {
 	NR_KMALLOC_TYPES
 };
 
-#ifndef CONFIG_SLOB
 extern struct kmem_cache *
 kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1];
 
@@ -458,7 +444,6 @@ static __always_inline unsigned int __kmalloc_index(size_t size,
 }
 static_assert(PAGE_SHIFT <= 20);
 #define kmalloc_index(s) __kmalloc_index(s, true)
-#endif /* !CONFIG_SLOB */
 
 void *__kmalloc(size_t size, gfp_t flags) __assume_kmalloc_alignment __alloc_size(1);
 
@@ -487,10 +472,6 @@ void kmem_cache_free(struct kmem_cache *s, void *objp);
 void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p);
 int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, void **p);
 
-/*
- * Caller must not use kfree_bulk() on memory not originally allocated
- * by kmalloc(), because the SLOB allocator cannot handle this.
- */
 static __always_inline void kfree_bulk(size_t size, void **p)
 {
 	kmem_cache_free_bulk(NULL, size, p);
@@ -567,7 +548,6 @@ void *kmalloc_large_node(size_t size, gfp_t flags, int node) __assume_page_align
  *	Try really hard to succeed the allocation but fail
  *	eventually.
  */
-#ifndef CONFIG_SLOB
 static __always_inline __alloc_size(1) void *kmalloc(size_t size, gfp_t flags)
 {
 	if (__builtin_constant_p(size) && size) {
@@ -583,17 +563,7 @@ static __always_inline __alloc_size(1) void *kmalloc(size_t size, gfp_t flags)
 	}
 	return __kmalloc(size, flags);
 }
-#else
-static __always_inline __alloc_size(1) void *kmalloc(size_t size, gfp_t flags)
-{
-	if (__builtin_constant_p(size) && size > KMALLOC_MAX_CACHE_SIZE)
-		return kmalloc_large(size, flags);
-
-	return __kmalloc(size, flags);
-}
-#endif
 
-#ifndef CONFIG_SLOB
 static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp_t flags, int node)
 {
 	if (__builtin_constant_p(size) && size) {
@@ -609,15 +579,6 @@ static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp_t fla
 	}
 	return __kmalloc_node(size, flags, node);
 }
-#else
-static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp_t flags, int node)
-{
-	if (__builtin_constant_p(size) && size > KMALLOC_MAX_CACHE_SIZE)
-		return kmalloc_large_node(size, flags, node);
-
-	return __kmalloc_node(size, flags, node);
-}
-#endif
 
 /**
  * kmalloc_array - allocate memory for an array.