From: Vitaly Kuznetsov <vkuznets@redhat.com>
Date: Fri, 28 Jan 2022 11:34:12 +0100
Patch-mainline: v5.18-rc1
Subject: Drivers: hv: Compare cpumasks and not their weights in init_vp_index()
Git-commit: 4ee524587105011ef43e5bd3ef5ed019715363dd
References: git-fixes

The condition is supposed to check whether 'allocated_mask' got fully
exhausted, i.e. there's no free CPU on the NUMA node left so we have
to use one of the already used CPUs. As only bits which correspond
to CPUs from 'cpumask_of_node(numa_node)' get set in 'allocated_mask',
checking for the equal weights is technically correct but not obvious.
Let's compare cpumasks directly.

No functional change intended.

Suggested-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20220128103412.3033736-3-vkuznets@redhat.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Acked-by: Olaf Hering <ohering@suse.de>
---
 drivers/hv/channel_mgmt.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -762,8 +762,7 @@ static void init_vp_index(struct vmbus_channel *channel)
 		}
 		allocated_mask = &hv_context.hv_numa_map[numa_node];
 
-		if (cpumask_weight(allocated_mask) ==
-		    cpumask_weight(cpumask_of_node(numa_node))) {
+		if (cpumask_equal(allocated_mask, cpumask_of_node(numa_node))) {
 			/*
 			 * We have cycled through all the CPUs in the node;
 			 * reset the allocated map.