Merge upstream kernel changes into 'C/H/S support' branch of libata.

1 files changed, 40 insertions, 0 deletions

diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
new file mode 100644
index 0000000000..7fd0576a44
--- /dev/null
+++ b/include/linux/genalloc.h
@@ -0,0 +1,40 @@
+/*
+ * Basic general purpose allocator for managing special purpose memory
+ * not managed by the regular kmalloc/kfree interface.
+ * Uses for this includes on-device special memory, uncached memory
+ * etc.
+ *
+ * This code is based on the buddy allocator found in the sym53c8xx_2
+ * driver, adapted for general purpose use.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+ */
+
+#include <linux/spinlock.h>
+
+#define ALLOC_MIN_SHIFT         5 /* 32 bytes minimum */
+/*
+ *  Link between free memory chunks of a given size.
+ */
+struct gen_pool_link {
+        struct gen_pool_link *next;
+};
+
+/*
+ *  Memory pool descriptor.
+ */
+struct gen_pool {
+        spinlock_t lock;
+        unsigned long (*get_new_chunk)(struct gen_pool *);
+        struct gen_pool *next;
+        struct gen_pool_link *h;
+        unsigned long private;
+        int max_chunk_shift;
+};
+
+unsigned long gen_pool_alloc(struct gen_pool *poolp, int size);
+void gen_pool_free(struct gen_pool *mp, unsigned long ptr, int size);
+struct gen_pool *gen_pool_create(int nr_chunks, int max_chunk_shift,
+                                 unsigned long (*fp)(struct gen_pool *),
+                                 unsigned long data);