Use explicit copy in vdso_gettimeofday()

Jeremy's gcc 3.4 seems to be unable to inline a 8 byte memcpy. But
the vdso doesn't support external references. Copy the structure
members of struct timezone explicitely instead.

Signed-off-by: Andi Kleen <ak@linux.intel.com>

Index: linux/arch/x86/vdso/vclock_gettime.c
===================================================================
--- linux.orig/arch/x86/vdso/vclock_gettime.c
+++ linux/arch/x86/vdso/vclock_gettime.c
@@ -106,9 +106,9 @@ int __vdso_gettimeofday(struct timeval *
 		do_realtime((struct timespec *)tv);
 		tv->tv_usec /= 1000;
 		if (tz != NULL) {
-			/* This relies on gcc inlining the memcpy. We'll notice
-			   if it ever fails to do so. */
-			memcpy(tz, &gtod->sys_tz, sizeof(struct timezone));
+			/* Don't use memcpy. Some old compilers fail to inline it */
+			tz->tz_minuteswest = gtod->sys_tz.tz_minuteswest;
+			tz->tz_dsttime = gtod->sys_tz.tz_dsttime;
 		}
 		return 0;
 	}