Merge branches 'uaccess.alpha', 'uaccess.arc', 'uaccess.arm', 'uaccess.arm64', 'uaccess.avr32', 'uaccess.bfin', 'uaccess.c6x', 'uaccess.cris', 'uaccess.frv', 'uaccess.h8300', 'uaccess.hexagon', 'uaccess.ia64', 'uaccess.m32r', 'uaccess.m68k', 'uaccess.metag', 'uaccess.microblaze', 'uaccess.mips', 'uaccess.mn10300', 'uaccess.nios2', 'uaccess.openrisc', 'uaccess.parisc', 'uaccess.powerpc', 'uaccess.s390', 'uaccess.score', 'uaccess.sh', 'uaccess.sparc', 'uaccess.tile', 'uaccess.um', 'uaccess.unicore32', 'uaccess.x86' and 'uaccess.xtensa' into work.uaccess

arch/hexagon/Kconfig

@@ -26,6 +26,7 @@ config HEXAGON
 	select GENERIC_CLOCKEVENTS_BROADCAST
 	select MODULES_USE_ELF_RELA
 	select GENERIC_CPU_DEVICES
+	select ARCH_HAS_RAW_COPY_USER
 	---help---
 	  Qualcomm Hexagon is a processor architecture designed for high
 	  performance and low power across a wide variety of applications.

arch/hexagon/include/asm/Kbuild

@@ -11,6 +11,7 @@ generic-y += device.h
 generic-y += div64.h
 generic-y += emergency-restart.h
 generic-y += errno.h
+generic-y += extable.h
 generic-y += fb.h
 generic-y += fcntl.h
 generic-y += ftrace.h

arch/hexagon/include/asm/pgtable.h

@@ -26,6 +26,7 @@
  */
 #include <linux/swap.h>
 #include <asm/page.h>
+#define __ARCH_USE_5LEVEL_HACK
 #include <asm-generic/pgtable-nopmd.h>
 
 /* A handy thing to have if one has the RAM. Declared in head.S */

arch/hexagon/include/asm/uaccess.h

@@ -23,7 +23,6 @@
 /*
  * User space memory access functions
  */
-#include <linux/sched.h>
 #include <linux/mm.h>
 #include <asm/segment.h>
 #include <asm/sections.h>
@@ -50,8 +49,6 @@
  * reasonably simple and not *too* slow.  After all, we've got the
  * MMU for backup.
  */
-#define VERIFY_READ     0
-#define VERIFY_WRITE    1
 
 #define __access_ok(addr, size) \
 	((get_fs().seg == KERNEL_DS.seg) || \
@@ -68,19 +65,12 @@
  */
 
 /*  Assembly somewhat optimized copy routines  */
-unsigned long __copy_from_user_hexagon(void *to, const void __user *from,
+unsigned long raw_copy_from_user(void *to, const void __user *from,
 				     unsigned long n);
-unsigned long __copy_to_user_hexagon(void __user *to, const void *from,
+unsigned long raw_copy_to_user(void __user *to, const void *from,
 				   unsigned long n);
-
-#define __copy_from_user(to, from, n) __copy_from_user_hexagon(to, from, n)
-#define __copy_to_user(to, from, n) __copy_to_user_hexagon(to, from, n)
-
-/*
- * XXX todo: some additonal performance gain is possible by
- * implementing __copy_to/from_user_inatomic, which is much
- * like __copy_to/from_user, but performs slightly less checking.
- */
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
 
 __kernel_size_t __clear_user_hexagon(void __user *dest, unsigned long count);
 #define __clear_user(a, s) __clear_user_hexagon((a), (s))
@@ -107,10 +97,14 @@ static inline long hexagon_strncpy_from_user(char *dst, const char __user *src,
 		return -EFAULT;
 
 	if (res > n) {
-		copy_from_user(dst, src, n);
+		long left = raw_copy_from_user(dst, src, n);
+		if (unlikely(left))
+			memset(dst + (n - left), 0, left);
 		return n;
 	} else {
-		copy_from_user(dst, src, res);
+		long left = raw_copy_from_user(dst, src, res);
+		if (unlikely(left))
+			memset(dst + (res - left), 0, left);
 		return res-1;
 	}
 }

arch/hexagon/kernel/hexagon_ksyms.c

@@ -25,8 +25,8 @@
 
 /* Additional functions */
 EXPORT_SYMBOL(__clear_user_hexagon);
-EXPORT_SYMBOL(__copy_from_user_hexagon);
-EXPORT_SYMBOL(__copy_to_user_hexagon);
+EXPORT_SYMBOL(raw_copy_from_user);
+EXPORT_SYMBOL(raw_copy_to_user);
 EXPORT_SYMBOL(__iounmap);
 EXPORT_SYMBOL(__strnlen_user);
 EXPORT_SYMBOL(__vmgetie);

arch/hexagon/mm/copy_from_user.S

@@ -44,7 +44,7 @@
 #define bytes r2
 #define loopcount r5
 
-#define FUNCNAME __copy_from_user_hexagon
+#define FUNCNAME raw_copy_from_user
 #include "copy_user_template.S"
 
 	/* LOAD FAULTS from COPY_FROM_USER */

arch/hexagon/mm/copy_to_user.S

@@ -43,7 +43,7 @@
 #define bytes r2
 #define loopcount r5
 
-#define FUNCNAME __copy_to_user_hexagon
+#define FUNCNAME raw_copy_to_user
 #include "copy_user_template.S"
 
 	/* STORE FAULTS from COPY_TO_USER */