[PATCH] x86_64: Use common sys_time64

Keeping this function does not makes sense because it's a copied (and
buggy) copy of sys_time. The only difference is that now.tv_sec (which is
a time_t, i.e. a 64-bit long) is copied (and truncated) into a int
(32-bit).

The prototype is the same (they both take a long __user *), so let's drop
this and redirect it to sys_time (and make sure it exists by defining
__ARCH_WANT_SYS_TIME).

Only disadvantage is that the sys_stime definition is also compiled (may be
fixed if needed by adding a separate __ARCH_WANT_SYS_STIME macro, and
defining it for all arch's defining __ARCH_WANT_SYS_TIME except x86_64).

Acked-by: Andi Kleen <[e-mail]>
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Andi Kleen <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/x86_64/kernel/sys_x86_64.c

···
 		err |= copy_to_user(&name->machine, "i686", 5); 		
 	return err ? -EFAULT : 0;
 }
-
-asmlinkage long sys_time64(long __user * tloc)
-{
-	struct timeval now; 
-	int i; 
-
-	do_gettimeofday(&now);
-	i = now.tv_sec;
-	if (tloc) {
-		if (put_user(i,tloc))
-			i = -EFAULT;
-	}
-	return i;
-}

include/asm-x86_64/unistd.h

···
 #define __NR_tkill	200
 __SYSCALL(__NR_tkill, sys_tkill) 
 #define __NR_time      201
-__SYSCALL(__NR_time, sys_time64)
+__SYSCALL(__NR_time, sys_time)
 #define __NR_futex     202
 __SYSCALL(__NR_futex, sys_futex)
 #define __NR_sched_setaffinity    203
···
 #define __ARCH_WANT_SYS_SIGPENDING
 #define __ARCH_WANT_SYS_SIGPROCMASK
 #define __ARCH_WANT_SYS_RT_SIGACTION
+#define __ARCH_WANT_SYS_TIME
 #define __ARCH_WANT_COMPAT_SYS_TIME
 #endif