Account for module percpu space separately from kernel  percpu

From: Jeremy Fitzhardinge <jeremy@goop.org>
Rather than using a single constant PERCPU_ENOUGH_ROOM, compute it as
the sum of kernel_percpu + PERCPU_MODULE_RESERVE.  This is taken
directly from the x86_64 tree.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Andi Kleen <ak@suse.de>

---
 include/asm-i386/percpu.h |   10 ++++++++++
 1 file changed, 10 insertions(+)

===================================================================
Index: linux/include/asm-i386/percpu.h
===================================================================
--- linux.orig/include/asm-i386/percpu.h
+++ linux/include/asm-i386/percpu.h
@@ -5,6 +5,16 @@
 #include <asm-generic/percpu.h>
 #else
 
+#ifdef CONFIG_MODULES
+# define PERCPU_MODULE_RESERVE 8192
+#else
+# define PERCPU_MODULE_RESERVE 0
+#endif
+
+#define PERCPU_ENOUGH_ROOM \
+	(ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \
+	 PERCPU_MODULE_RESERVE)
+
 /*
  * PER_CPU finds an address of a per-cpu variable.
  *