crypto: scatterwalk - Inline start/map/done

This patch inlines the functions scatterwalk_start, scatterwalk_map
and scatterwalk_done as they're all tiny and mostly used by the block
cipher walker.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 40 insertions, 6 deletions

diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h
index 7e1a33645eb5..880e6be9e95e 100644
--- a/include/crypto/scatterwalk.h
+++ b/include/crypto/scatterwalk.h
@@ -16,14 +16,10 @@
 #ifndef _CRYPTO_SCATTERWALK_H
 #define _CRYPTO_SCATTERWALK_H
 
-#include <asm/kmap_types.h>
 #include <crypto/algapi.h>
-#include <linux/hardirq.h>
 #include <linux/highmem.h>
 #include <linux/kernel.h>
-#include <linux/mm.h>
 #include <linux/scatterlist.h>
-#include <linux/sched.h>
 
 static inline void scatterwalk_crypto_chain(struct scatterlist *head,
                                             struct scatterlist *sg,
@@ -83,11 +79,49 @@ static inline void scatterwalk_unmap(void *vaddr)
         kunmap_atomic(vaddr);
 }
 
-void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg);
+static inline void scatterwalk_start(struct scatter_walk *walk,
+                                     struct scatterlist *sg)
+{
+        walk->sg = sg;
+        walk->offset = sg->offset;
+}
+
+static inline void *scatterwalk_map(struct scatter_walk *walk)
+{
+        return kmap_atomic(scatterwalk_page(walk)) +
+               offset_in_page(walk->offset);
+}
+
+static inline void scatterwalk_pagedone(struct scatter_walk *walk, int out,
+                                        unsigned int more)
+{
+        if (out) {
+                struct page *page;
+
+                page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT);
+                /* Test ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE first as
+                 * PageSlab cannot be optimised away per se due to
+                 * use of volatile pointer.
+                 */
+                if (ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE && !PageSlab(page))
+                        flush_dcache_page(page);
+        }
+
+        if (more && walk->offset >= walk->sg->offset + walk->sg->length)
+                scatterwalk_start(walk, sg_next(walk->sg));
+}
+
+static inline void scatterwalk_done(struct scatter_walk *walk, int out,
+                                    int more)
+{
+        if (!more || walk->offset >= walk->sg->offset + walk->sg->length ||
+            !(walk->offset & (PAGE_SIZE - 1)))
+                scatterwalk_pagedone(walk, out, more);
+}
+
 void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
                             size_t nbytes, int out);
 void *scatterwalk_map(struct scatter_walk *walk);
-void scatterwalk_done(struct scatter_walk *walk, int out, int more);
 
 void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
                               unsigned int start, unsigned int nbytes, int out);