diff mbox

[2/5] powerpc/numa: Check for all VPHN changes

Message ID 20110130092619.7e414259@kryten (mailing list archive)
State Accepted, archived
Commit d69043e8069f493ebee9472bcc78b3f54c5c27d9
Delegated to: Benjamin Herrenschmidt
Headers show

Commit Message

Anton Blanchard Jan. 29, 2011, 10:26 p.m. UTC 
The hypervisor uses unsigned 1 byte counters to signal topology changes to
the OS. Since they can wrap we need to check for any difference, not just if
the hypervisor count is greater than the previous count.

Signed-off-by: Anton Blanchard <anton@samba.org>
---
diff mbox

Patch

Index: linux-2.6/arch/powerpc/mm/numa.c
===================================================================
--- linux-2.6.orig/arch/powerpc/mm/numa.c	2011-01-29 11:16:56.741843175 +1100
+++ linux-2.6/arch/powerpc/mm/numa.c	2011-01-29 12:44:42.059356526 +1100
@@ -1342,7 +1342,7 @@  static int update_cpu_associativity_chan
 		volatile u8 *hypervisor_counts = lppaca[cpu].vphn_assoc_counts;
 
 		for (i = 0; i < distance_ref_points_depth; i++) {
-			if (hypervisor_counts[i] > counts[i]) {
+			if (hypervisor_counts[i] != counts[i]) {
 				counts[i] = hypervisor_counts[i];
 				changed = 1;
 			}