um: remove set_fs

Remove address space overrides using set_fs() for User Mode Linux.
Note that just like the existing kernel access case of the uaccess
routines the new nofault kernel handlers do not actually have any
exception handling.  This is probably broken, but not change to the
status quo.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Richard Weinberger <richard@nod.at>

1 files changed, 0 insertions, 25 deletions

diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c
index a509be911026..23775d01a2a6 100644
--- a/arch/um/kernel/skas/uaccess.c
+++ b/arch/um/kernel/skas/uaccess.c
@@ -146,11 +146,6 @@ static int copy_chunk_from_user(unsigned long from, int len, void *arg)
 
 unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
 {
-	if (uaccess_kernel()) {
-		memcpy(to, (__force void*)from, n);
-		return 0;
-	}
-
 	return buffer_op((unsigned long) from, n, 0, copy_chunk_from_user, &to);
 }
 EXPORT_SYMBOL(raw_copy_from_user);
@@ -166,11 +161,6 @@ static int copy_chunk_to_user(unsigned long to, int len, void *arg)
 
 unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
 {
-	if (uaccess_kernel()) {
-		memcpy((__force void *) to, from, n);
-		return 0;
-	}
-
 	return buffer_op((unsigned long) to, n, 1, copy_chunk_to_user, &from);
 }
 EXPORT_SYMBOL(raw_copy_to_user);
@@ -196,12 +186,6 @@ long strncpy_from_user(char *dst, const char __user *src, long count)
 
 	if (!access_ok(src, 1))
 		return -EFAULT;
-
-	if (uaccess_kernel()) {
-		strncpy(dst, (__force void *) src, count);
-		return strnlen(dst, count);
-	}
-
 	n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user,
 		      &ptr);
 	if (n != 0)
@@ -218,11 +202,6 @@ static int clear_chunk(unsigned long addr, int len, void *unused)
 
 unsigned long __clear_user(void __user *mem, unsigned long len)
 {
-	if (uaccess_kernel()) {
-		memset((__force void*)mem, 0, len);
-		return 0;
-	}
-
 	return buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL);
 }
 EXPORT_SYMBOL(__clear_user);
@@ -245,10 +224,6 @@ long strnlen_user(const char __user *str, long len)
 
 	if (!access_ok(str, 1))
 		return -EFAULT;
-
-	if (uaccess_kernel())
-		return strnlen((__force char*)str, len) + 1;
-
 	n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count);
 	if (n == 0)
 		return count + 1;