compat: generic compat get/settimeofday

Nothing arch specific in get/settimeofday.  The details of the timeval
conversion varied a little from arch to arch, but all with the same
results.

Also add an extern declaration for sys_tz to linux/time.h because externs
in .c files are fowned upon.  I'll kill the externs in various other files
in a sparate patch.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: David S. Miller <davem@davemloft.net> [ sparc bits ]
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Kyle McMartin <kyle@mcmartin.ca>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Grant Grundler <grundler@parisc-linux.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index ee51ca9..fc2c971 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -332,17 +332,17 @@
 	llgtr	%r3,%r3			# struct rusage_emu31 *
 	jg	compat_sys_getrusage	# branch to system call
 
-	.globl	sys32_gettimeofday_wrapper
-sys32_gettimeofday_wrapper:
+	.globl	compat_sys_gettimeofday_wrapper
+compat_sys_gettimeofday_wrapper:
 	llgtr	%r2,%r2			# struct timeval_emu31 *
 	llgtr	%r3,%r3			# struct timezone *
-	jg	sys32_gettimeofday	# branch to system call
+	jg	compat_sys_gettimeofday	# branch to system call
 
-	.globl	sys32_settimeofday_wrapper
-sys32_settimeofday_wrapper:
+	.globl	compat_sys_settimeofday_wrapper
+compat_sys_settimeofday_wrapper:
 	llgtr	%r2,%r2			# struct timeval_emu31 *
 	llgtr	%r3,%r3			# struct timezone *
-	jg	sys32_settimeofday	# branch to system call
+	jg	compat_sys_settimeofday	# branch to system call
 
 	.globl	sys32_getgroups16_wrapper
 sys32_getgroups16_wrapper: