Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 236 insertions, 0 deletions

diff --git a/kernel/arch/x86/include/asm/uaccess_64.h b/kernel/arch/x86/include/asm/uaccess_64.h
new file mode 100644
index 000000000..f2f9b39b2
--- /dev/null
+++ b/kernel/arch/x86/include/asm/uaccess_64.h
@@ -0,0 +1,236 @@
+#ifndef _ASM_X86_UACCESS_64_H
+#define _ASM_X86_UACCESS_64_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/compiler.h>
+#include <linux/errno.h>
+#include <linux/lockdep.h>
+#include <asm/alternative.h>
+#include <asm/cpufeature.h>
+#include <asm/page.h>
+
+/*
+ * Copy To/From Userspace
+ */
+
+/* Handles exceptions in both to and from, but doesn't do access_ok */
+__must_check unsigned long
+copy_user_enhanced_fast_string(void *to, const void *from, unsigned len);
+__must_check unsigned long
+copy_user_generic_string(void *to, const void *from, unsigned len);
+__must_check unsigned long
+copy_user_generic_unrolled(void *to, const void *from, unsigned len);
+
+static __always_inline __must_check unsigned long
+copy_user_generic(void *to, const void *from, unsigned len)
+{
+	unsigned ret;
+
+	/*
+	 * If CPU has ERMS feature, use copy_user_enhanced_fast_string.
+	 * Otherwise, if CPU has rep_good feature, use copy_user_generic_string.
+	 * Otherwise, use copy_user_generic_unrolled.
+	 */
+	alternative_call_2(copy_user_generic_unrolled,
+			 copy_user_generic_string,
+			 X86_FEATURE_REP_GOOD,
+			 copy_user_enhanced_fast_string,
+			 X86_FEATURE_ERMS,
+			 ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from),
+				     "=d" (len)),
+			 "1" (to), "2" (from), "3" (len)
+			 : "memory", "rcx", "r8", "r9", "r10", "r11");
+	return ret;
+}
+
+__must_check unsigned long
+copy_in_user(void __user *to, const void __user *from, unsigned len);
+
+static __always_inline __must_check
+int __copy_from_user_nocheck(void *dst, const void __user *src, unsigned size)
+{
+	int ret = 0;
+
+	if (!__builtin_constant_p(size))
+		return copy_user_generic(dst, (__force void *)src, size);
+	switch (size) {
+	case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
+			      ret, "b", "b", "=q", 1);
+		return ret;
+	case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
+			      ret, "w", "w", "=r", 2);
+		return ret;
+	case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
+			      ret, "l", "k", "=r", 4);
+		return ret;
+	case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
+			      ret, "q", "", "=r", 8);
+		return ret;
+	case 10:
+		__get_user_asm(*(u64 *)dst, (u64 __user *)src,
+			       ret, "q", "", "=r", 10);
+		if (unlikely(ret))
+			return ret;
+		__get_user_asm(*(u16 *)(8 + (char *)dst),
+			       (u16 __user *)(8 + (char __user *)src),
+			       ret, "w", "w", "=r", 2);
+		return ret;
+	case 16:
+		__get_user_asm(*(u64 *)dst, (u64 __user *)src,
+			       ret, "q", "", "=r", 16);
+		if (unlikely(ret))
+			return ret;
+		__get_user_asm(*(u64 *)(8 + (char *)dst),
+			       (u64 __user *)(8 + (char __user *)src),
+			       ret, "q", "", "=r", 8);
+		return ret;
+	default:
+		return copy_user_generic(dst, (__force void *)src, size);
+	}
+}
+
+static __always_inline __must_check
+int __copy_from_user(void *dst, const void __user *src, unsigned size)
+{
+	might_fault();
+	return __copy_from_user_nocheck(dst, src, size);
+}
+
+static __always_inline __must_check
+int __copy_to_user_nocheck(void __user *dst, const void *src, unsigned size)
+{
+	int ret = 0;
+
+	if (!__builtin_constant_p(size))
+		return copy_user_generic((__force void *)dst, src, size);
+	switch (size) {
+	case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
+			      ret, "b", "b", "iq", 1);
+		return ret;
+	case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
+			      ret, "w", "w", "ir", 2);
+		return ret;
+	case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
+			      ret, "l", "k", "ir", 4);
+		return ret;
+	case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
+			      ret, "q", "", "er", 8);
+		return ret;
+	case 10:
+		__put_user_asm(*(u64 *)src, (u64 __user *)dst,
+			       ret, "q", "", "er", 10);
+		if (unlikely(ret))
+			return ret;
+		asm("":::"memory");
+		__put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
+			       ret, "w", "w", "ir", 2);
+		return ret;
+	case 16:
+		__put_user_asm(*(u64 *)src, (u64 __user *)dst,
+			       ret, "q", "", "er", 16);
+		if (unlikely(ret))
+			return ret;
+		asm("":::"memory");
+		__put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
+			       ret, "q", "", "er", 8);
+		return ret;
+	default:
+		return copy_user_generic((__force void *)dst, src, size);
+	}
+}
+
+static __always_inline __must_check
+int __copy_to_user(void __user *dst, const void *src, unsigned size)
+{
+	might_fault();
+	return __copy_to_user_nocheck(dst, src, size);
+}
+
+static __always_inline __must_check
+int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
+{
+	int ret = 0;
+
+	might_fault();
+	if (!__builtin_constant_p(size))
+		return copy_user_generic((__force void *)dst,
+					 (__force void *)src, size);
+	switch (size) {
+	case 1: {
+		u8 tmp;
+		__get_user_asm(tmp, (u8 __user *)src,
+			       ret, "b", "b", "=q", 1);
+		if (likely(!ret))
+			__put_user_asm(tmp, (u8 __user *)dst,
+				       ret, "b", "b", "iq", 1);
+		return ret;
+	}
+	case 2: {
+		u16 tmp;
+		__get_user_asm(tmp, (u16 __user *)src,
+			       ret, "w", "w", "=r", 2);
+		if (likely(!ret))
+			__put_user_asm(tmp, (u16 __user *)dst,
+				       ret, "w", "w", "ir", 2);
+		return ret;
+	}
+
+	case 4: {
+		u32 tmp;
+		__get_user_asm(tmp, (u32 __user *)src,
+			       ret, "l", "k", "=r", 4);
+		if (likely(!ret))
+			__put_user_asm(tmp, (u32 __user *)dst,
+				       ret, "l", "k", "ir", 4);
+		return ret;
+	}
+	case 8: {
+		u64 tmp;
+		__get_user_asm(tmp, (u64 __user *)src,
+			       ret, "q", "", "=r", 8);
+		if (likely(!ret))
+			__put_user_asm(tmp, (u64 __user *)dst,
+				       ret, "q", "", "er", 8);
+		return ret;
+	}
+	default:
+		return copy_user_generic((__force void *)dst,
+					 (__force void *)src, size);
+	}
+}
+
+static __must_check __always_inline int
+__copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
+{
+	return __copy_from_user_nocheck(dst, src, size);
+}
+
+static __must_check __always_inline int
+__copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
+{
+	return __copy_to_user_nocheck(dst, src, size);
+}
+
+extern long __copy_user_nocache(void *dst, const void __user *src,
+				unsigned size, int zerorest);
+
+static inline int
+__copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
+{
+	might_fault();
+	return __copy_user_nocache(dst, src, size, 1);
+}
+
+static inline int
+__copy_from_user_inatomic_nocache(void *dst, const void __user *src,
+				  unsigned size)
+{
+	return __copy_user_nocache(dst, src, size, 0);
+}
+
+unsigned long
+copy_user_handle_tail(char *to, char *from, unsigned len);
+
+#endif /* _ASM_X86_UACCESS_64_H */