linux-kernel - [PATCH AUTOSEL 4.9 13/15] powerpc/numa: Suppress "VPHN is not supported" messages

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Message-Id: <20181122195621.13776-13-sashal@kernel.org>
Date:   Thu, 22 Nov 2018 14:56:19 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <sashal@...nel.org>, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH AUTOSEL 4.9 13/15] powerpc/numa: Suppress "VPHN is not supported" messages

From: Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>

[ Upstream commit 437ccdc8ce629470babdda1a7086e2f477048cbd ]

When VPHN function is not supported and during cpu hotplug event,
kernel prints message 'VPHN function not supported. Disabling
polling...'. Currently it prints on every hotplug event, it floods
dmesg when a KVM guest tries to hotplug huge number of vcpus, let's
just print once and suppress further kernel prints.

Signed-off-by: Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/powerpc/mm/numa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 6cff96e0d77b..0ef83c274019 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -1289,7 +1289,7 @@ static long vphn_get_associativity(unsigned long cpu,
 
 	switch (rc) {
 	case H_FUNCTION:
-		printk(KERN_INFO
+		printk_once(KERN_INFO
 			"VPHN is not supported. Disabling polling...\n");
 		stop_topology_update();
 		break;
-- 
2.17.1