Merge commit 'v2.6.32' into reiserfs/kill-bkl

Merge-reason: The tree was based 2.6.31. It's better to be up to date
with 2.6.32. Although no conflicting changes were made in between,
it gives benchmarking results closer to the lastest kernel behaviour.

1 files changed, 12 insertions, 5 deletions

diff --git a/include/linux/io-mapping.h b/include/linux/io-mapping.h
index 0adb0f91568c..97eb928b4924 100644
--- a/include/linux/io-mapping.h
+++ b/include/linux/io-mapping.h
@@ -49,23 +49,30 @@ static inline struct io_mapping *
 io_mapping_create_wc(resource_size_t base, unsigned long size)
 {
         struct io_mapping *iomap;
-
-        if (!is_io_mapping_possible(base, size))
-                return NULL;
+        pgprot_t prot;
 
         iomap = kmalloc(sizeof(*iomap), GFP_KERNEL);
         if (!iomap)
-                return NULL;
+                goto out_err;
+
+        if (iomap_create_wc(base, size, &prot))
+                goto out_free;
 
         iomap->base = base;
         iomap->size = size;
-        iomap->prot = pgprot_writecombine(__pgprot(__PAGE_KERNEL));
+        iomap->prot = prot;
         return iomap;
+
+out_free:
+        kfree(iomap);
+out_err:
+        return NULL;
 }
 
 static inline void
 io_mapping_free(struct io_mapping *mapping)
 {
+        iomap_free(mapping->base, mapping->size);
         kfree(mapping);
 }