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-rw-r--r--include/linux/slab.h39
1 files changed, 28 insertions, 11 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 0c621752caa6..9690c14eb7fb 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -169,11 +169,7 @@ struct kmem_cache {
struct list_head list; /* List of all slab caches on the system */
};
-#define KMALLOC_MAX_SIZE (1UL << 30)
-
-#include <linux/slob_def.h>
-
-#else /* CONFIG_SLOB */
+#endif /* CONFIG_SLOB */
/*
* Kmalloc array related definitions
@@ -195,7 +191,9 @@ struct kmem_cache {
#ifndef KMALLOC_SHIFT_LOW
#define KMALLOC_SHIFT_LOW 5
#endif
-#else
+#endif
+
+#ifdef CONFIG_SLUB
/*
* SLUB allocates up to order 2 pages directly and otherwise
* passes the request to the page allocator.
@@ -207,6 +205,19 @@ struct kmem_cache {
#endif
#endif
+#ifdef CONFIG_SLOB
+/*
+ * SLOB passes all page size and larger requests to the page allocator.
+ * No kmalloc array is necessary since objects of different sizes can
+ * be allocated from the same page.
+ */
+#define KMALLOC_SHIFT_MAX 30
+#define KMALLOC_SHIFT_HIGH PAGE_SHIFT
+#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 */
@@ -221,6 +232,7 @@ struct kmem_cache {
#define KMALLOC_MIN_SIZE (1 << KMALLOC_SHIFT_LOW)
#endif
+#ifndef CONFIG_SLOB
extern struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
#ifdef CONFIG_ZONE_DMA
extern struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1];
@@ -275,13 +287,18 @@ static __always_inline int kmalloc_index(size_t size)
/* Will never be reached. Needed because the compiler may complain */
return -1;
}
+#endif /* !CONFIG_SLOB */
#ifdef CONFIG_SLAB
#include <linux/slab_def.h>
-#elif defined(CONFIG_SLUB)
+#endif
+
+#ifdef CONFIG_SLUB
#include <linux/slub_def.h>
-#else
-#error "Unknown slab allocator"
+#endif
+
+#ifdef CONFIG_SLOB
+#include <linux/slob_def.h>
#endif
/*
@@ -291,6 +308,7 @@ static __always_inline int kmalloc_index(size_t size)
*/
static __always_inline int kmalloc_size(int n)
{
+#ifndef CONFIG_SLOB
if (n > 2)
return 1 << n;
@@ -299,10 +317,9 @@ static __always_inline int kmalloc_size(int n)
if (n == 2 && KMALLOC_MIN_SIZE <= 64)
return 192;
-
+#endif
return 0;
}
-#endif /* !CONFIG_SLOB */
/*
* Setting ARCH_SLAB_MINALIGN in arch headers allows a different alignment.