[PATCH] Common compat_sys_sysinfo

I noticed that almost all architectures implemented exactly the same
sys32_sysinfo...  except parisc, where a bug was to be found in handling of
the uptime.  So let's remove a whole whack of code for fun and profit.
Cribbed compat_sys_sysinfo from x86_64's implementation, since I figured it
would be the best tested.

This patch incorporates Arnd's suggestion of not using set_fs/get_fs, but
instead extracting out the common code from sys_sysinfo.

Cc: Christoph Hellwig <hch@infradead.org>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/parisc/kernel/syscall_table.S b/arch/parisc/kernel/syscall_table.S
index 701d66a..be8eb9a 100644
--- a/arch/parisc/kernel/syscall_table.S
+++ b/arch/parisc/kernel/syscall_table.S
@@ -197,7 +197,7 @@
 	/* struct rusage contains longs... */
 	ENTRY_COMP(wait4)
 	ENTRY_SAME(swapoff)		/* 115 */
-	ENTRY_DIFF(sysinfo)
+	ENTRY_COMP(sysinfo)
 	ENTRY_SAME(shutdown)
 	ENTRY_SAME(fsync)
 	ENTRY_SAME(madvise)