um: Remove __access_ok_vsyscall()

FIXADDR_USER_START and FIXADDR_USER_END are now always zero.

Signed-off-by: Thomas Weißschuh <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Johannes Berg <[e-mail]>

arch/um/include/asm/uaccess.h

···
 	(((unsigned long) (addr) < TASK_SIZE) && \
 	 (((unsigned long) (addr) + (size)) < TASK_SIZE))
 
-#define __access_ok_vsyscall(addr, size) \
-	  (((unsigned long) (addr) >= FIXADDR_USER_START) && \
-	  ((unsigned long) (addr) + (size) <= FIXADDR_USER_END))
-
 #define __addr_range_nowrap(addr, size) \
 	((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
 
···
 static inline int __access_ok(const void __user *ptr, unsigned long size)
 {
 	unsigned long addr = (unsigned long)ptr;
-	return __addr_range_nowrap(addr, size) &&
-		(__under_task_size(addr, size) ||
-		 __access_ok_vsyscall(addr, size));
+	return __addr_range_nowrap(addr, size) && __under_task_size(addr, size);
 }
 
 #define __get_kernel_nofault(dst, src, type, err_label)			\