From 5205d08b5f5d8b81b6463d46033a56bec08409cc Mon Sep 17 00:00:00 2001
From: =?utf8?q?Fran=C3=A7ois=20Tigeot?= <ftigeot@wolfpond.org>
Date: Sat, 28 Feb 2015 09:46:22 +0100
Subject: [PATCH] drm: Add asm/uaccess.h functions

* __copy_to_user() and __copy_from_user(), obtained from OpenBSD

* __copy_to_user_inatomic() and __copy_from_user_inatomic_nocache(),
  obtained from FreeBSD
---
 sys/dev/drm/include/asm/uaccess.h | 36 +++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/sys/dev/drm/include/asm/uaccess.h b/sys/dev/drm/include/asm/uaccess.h
index e432d52a53..a7d8d83713 100644
--- a/sys/dev/drm/include/asm/uaccess.h
+++ b/sys/dev/drm/include/asm/uaccess.h
@@ -47,4 +47,40 @@ copy_from_user(void *to, const void *from, unsigned long n)
 	return 0;
 }
 
+static inline int
+__copy_to_user(void *to, const void *from, unsigned len)
+{
+	if (copyout(from, to, len))
+		return len;
+	return 0;
+}
+
+static inline unsigned long
+__copy_from_user(void *to, const void *from, unsigned len)
+{
+	if (copyin(from, to, len))
+		return len;
+	return 0;
+}
+
+static inline int
+__copy_to_user_inatomic(void __user *to, const void *from, unsigned n)
+{
+	return (copyout_nofault(from, to, n) != 0 ? n : 0);
+}
+
+static inline unsigned long
+__copy_from_user_inatomic_nocache(void *to, const void __user *from,
+    unsigned long n)
+{
+	/*
+	 * XXXKIB.  Equivalent Linux function is implemented using
+	 * MOVNTI for aligned moves.  For unaligned head and tail,
+	 * normal move is performed.  As such, it is not incorrect, if
+	 * only somewhat slower, to use normal copyin.  All uses
+	 * except shmem_pwrite_fast() have the destination mapped WC.
+	 */
+	return ((copyin_nofault(__DECONST(void *, from), to, n) != 0 ? n : 0));
+}
+
 #endif	/* _ASM_UACCESS_H_ */
-- 
2.41.0