[CRYPTO] scatterwalk: Move scatterwalk.h to linux/crypto

The scatterwalk infrastructure is used by algorithms so it needs to
move out of crypto for future users that may live in drivers/crypto
or asm/*/crypto.

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

1 files changed, 34 insertions, 2 deletions

diff --git a/crypto/scatterwalk.h b/include/crypto/scatterwalk.h
index fd5517d2a7a9..07b6f17122d2 100644
--- a/crypto/scatterwalk.h
+++ b/include/crypto/scatterwalk.h
@@ -1,9 +1,10 @@
 /*
- * Cryptographic API.
+ * Cryptographic scatter and gather helpers.
  *
  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  * Copyright (c) 2002 Adam J. Richter <adam@yggdrasil.com>
  * Copyright (c) 2004 Jean-Luc Cooke <jlcooke@certainkey.com>
+ * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
@@ -15,10 +16,41 @@
 #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 "internal.h"
+static inline enum km_type crypto_kmap_type(int out)
+{
+	enum km_type type;
+
+	if (in_softirq())
+		type = out * (KM_SOFTIRQ1 - KM_SOFTIRQ0) + KM_SOFTIRQ0;
+	else
+		type = out * (KM_USER1 - KM_USER0) + KM_USER0;
+
+	return type;
+}
+
+static inline void *crypto_kmap(struct page *page, int out)
+{
+	return kmap_atomic(page, crypto_kmap_type(out));
+}
+
+static inline void crypto_kunmap(void *vaddr, int out)
+{
+	kunmap_atomic(vaddr, crypto_kmap_type(out));
+}
+
+static inline void crypto_yield(u32 flags)
+{
+	if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
+		cond_resched();
+}
 
 static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in,
 						struct scatter_walk *walk_out)