linux-kernel - [PATCH] mm/mempolicy: failed to disable numa balancing

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Date:   Fri,  2 Dec 2022 22:16:30 +0800
From:   tzm <tcm1030@....com>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        tzm <tcm1030@....com>
Subject: [PATCH] mm/mempolicy: failed to disable numa balancing

It will be failed to  disable numa balancing policy permanently by passing
<numa_balancing=disable> to boot cmdline parameters.
The numabalancing_override variable is int and 1 for enable -1 for disable.
So, !enumabalancing_override will always be true, which cause this bug.

Signed-off-by: tzm <tcm1030@....com>
---
 mm/mempolicy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 61aa9aedb728..2789c0920293 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2865,7 +2865,7 @@ static void __init check_numabalancing_enable(void)
 	if (numabalancing_override)
 		set_numabalancing_state(numabalancing_override == 1);
 
-	if (num_online_nodes() > 1 && !numabalancing_override) {
+	if (num_online_nodes() > 1 && (numabalancing_override == 1)) {
 		pr_info("%s automatic NUMA balancing. Configure with numa_balancing= or the kernel.numa_balancing sysctl\n",
 			numabalancing_default ? "Enabling" : "Disabling");
 		set_numabalancing_state(numabalancing_default);
-- 
2.27.0