x86: 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>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/vdso/vclock_gettime.c b/arch/x86/vdso/vclock_gettime.c
index 23476c2..efa2ba7 100644 (file)
--- a/arch/x86/vdso/vclock_gettime.c
+++ b/arch/x86/vdso/vclock_gettime.c
@@ -106,9 +106,9 @@ int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
                do_realtime((struct timespec *)tv);
                tv->tv_usec /= 1000;
                if (unlikely(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));
+                       /* Avoid 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;
        }