linux-kernel - [RFC V2 05/12] cpuset: Add cpuset_inc() inside cpuset

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Message-Id: <20170130033602.12275-6-khandual@linux.vnet.ibm.com>
Date:   Mon, 30 Jan 2017 09:05:46 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     mhocko@...e.com, vbabka@...e.cz, mgorman@...e.de,
        minchan@...nel.org, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, srikar@...ux.vnet.ibm.com,
        haren@...ux.vnet.ibm.com, jglisse@...hat.com,
        dave.hansen@...el.com, dan.j.williams@...el.com
Subject: [RFC V2 05/12] cpuset: Add cpuset_inc() inside cpuset_init()

Currently cpusets_enabled() wrongfully returns 0 even if we have a root
cpuset configured on the system. This got missed when jump level was
introduced in place of number_of_cpusets with the commit 664eeddeef65
("mm: page_alloc: use jump labels to avoid checking number_of_cpusets")
. This fixes the problem so that cpusets_enabled() returns positive even
for the root cpuset.

Fixes: 664eeddeef65 ("mm: page_alloc: use jump labels to avoid")
Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
---
 kernel/cpuset.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index b308888..be75f3f 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -2133,6 +2133,8 @@ int __init cpuset_init(void)
 	set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags);
 	top_cpuset.relax_domain_level = -1;
 
+	cpuset_inc();
+
 	err = register_filesystem(&cpuset_fs_type);
 	if (err < 0)
 		return err;
-- 
2.9.3