Provide example copy_in_user implementation

[Pavel Machek]

Hi!

This patch adds example copy_in_user implementation (copy_in_user is
needed for new ioctl32 implementation, all 64bit archs will need
it)... Please apply,

								Pavel

Index: linux/include/asm-generic/uaccess.h
===================================================================
--- linux.orig/include/asm-generic/uaccess.h	2003-06-17 17:10:44.000000000 +0200
+++ linux/include/asm-generic/uaccess.h	2003-06-16 16:09:52.000000000 +0200
@@ -0,0 +1,13 @@
+static inline unsigned long copy_in_user(void *dst, const void *src, unsigned size) 
+{ 
+	unsigned i, ret;
+	unsigned char c;
+	for (i=0; i<size; i++) {
+		if (copy_from_user(&c, src+i, 1)) 
+			return size-i;
+		if (copy_to_user(dst+i, &c, 1))
+			return size-i;
+	}
+	return 0;
+}	
+

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