s390/numa: let NODES_SHIFT depend on NEED_MULTIPLE_NODES

[ Upstream commit 64438e1bc0cdbe6d30bcdcb976f935eb3c297adc ]

Qian Cai reported:
"""
When NUMA=n and nr_node_ids=2, in apply_wqattrs_prepare(), it has,

for_each_node(node) {
        if (wq_calc_node_cpumask(...

where it will trigger a booting warning,

WARNING: workqueue cpumask: online intersect > possible intersect

because it found 2 nodes and wq_numa_possible_cpumask[1] is an empty
cpumask.
"""

Let NODES_SHIFT depend on NEED_MULTIPLE_NODES like it is done
on other architectures in order to fix this.

Fixes: 701dc81e7412 ("s390/mm: remove fake numa support")
Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 2167bce993ff69753ed03b967458ea2186b094a1..ae01be202204b240970f9547a54fe7b21bd7730b 100644 (file)
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -462,6 +462,7 @@ config NUMA
 
 config NODES_SHIFT
        int
+       depends on NEED_MULTIPLE_NODES
        default "1"
 
 config SCHED_SMT