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

Submitted by Anton Blanchard on Jan. 29, 2011, 10:26 p.m.

Details

Message ID 20110130092619.7e414259@kryten
State Accepted, archived
Commit d69043e8069f493ebee9472bcc78b3f54c5c27d9
Delegated to: Benjamin Herrenschmidt
Headers show

Commit Message

Anton Blanchard Jan. 29, 2011, 10:26 p.m.
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>
---

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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;
 			}