openrisc: use generic strncpy_from_user
As per commits 2922585b9329 ("lib: Sparc's strncpy_from_user is generic
enough, move under lib/") and 92ae03f2ef99 ("x86: merge 32/64-bit
versions of 'strncpy_from_user()' and speed it up"), and corresponding
discussion on linux-arch.
Signed-off-by: Jonas Bonn <jonas@southpole.se>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index 4932247..0656232 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -19,6 +19,7 @@
select GENERIC_CPU_DEVICES
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
+ select GENERIC_STRNCPY_FROM_USER
config MMU
def_bool y
diff --git a/arch/openrisc/include/asm/uaccess.h b/arch/openrisc/include/asm/uaccess.h
index f5abaa0..04b93de 100644
--- a/arch/openrisc/include/asm/uaccess.h
+++ b/arch/openrisc/include/asm/uaccess.h
@@ -313,14 +313,10 @@
return size;
}
-extern int __strncpy_from_user(char *dst, const char *src, long count);
+#define user_addr_max() \
+ (segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)
-static inline long strncpy_from_user(char *dst, const char *src, long count)
-{
- if (access_ok(VERIFY_READ, src, 1))
- return __strncpy_from_user(dst, src, count);
- return -EFAULT;
-}
+extern long strncpy_from_user(char *dest, const char __user *src, long count);
/*
* Return the size of a string (including the ending 0)
diff --git a/arch/openrisc/lib/string.S b/arch/openrisc/lib/string.S
index 465f04b..8ceb11e 100644
--- a/arch/openrisc/lib/string.S
+++ b/arch/openrisc/lib/string.S
@@ -104,58 +104,6 @@
.long 9b, 99b // write fault
.previous
-/*
- * long strncpy_from_user(char *dst, const char *src, long count)
- *
- *
- */
- .global __strncpy_from_user
-__strncpy_from_user:
- l.addi r1,r1,-16
- l.sw 0(r1),r6
- l.sw 4(r1),r5
- l.sw 8(r1),r4
- l.sw 12(r1),r3
-
- l.addi r11,r5,0
-2: l.sfeq r5,r0
- l.bf 1f
- l.addi r5,r5,-1
-8: l.lbz r6,0(r4)
- l.sfeq r6,r0
- l.bf 1f
-9: l.sb 0(r3),r6
- l.addi r3,r3,1
- l.j 2b
- l.addi r4,r4,1
-1:
- l.lwz r6,0(r1)
- l.addi r5,r5,1
- l.sub r11,r11,r5 // r11 holds the return value
-
- l.lwz r6,0(r1)
- l.lwz r5,4(r1)
- l.lwz r4,8(r1)
- l.lwz r3,12(r1)
- l.jr r9
- l.addi r1,r1,16
-
- .section .fixup, "ax"
-99:
- l.movhi r11,hi(-EFAULT)
- l.ori r11,r11,lo(-EFAULT)
-
- l.lwz r6,0(r1)
- l.lwz r5,4(r1)
- l.lwz r4,8(r1)
- l.lwz r3,12(r1)
- l.jr r9
- l.addi r1,r1,16
- .previous
-
- .section __ex_table, "a"
- .long 8b, 99b // read fault
- .previous
/*
* extern int __strnlen_user(const char *str, long len, unsigned long top);