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Heiko Carstens 64438e1bc0 s390/numa: let NODES_SHIFT depend on NEED_MULTIPLE_NODES
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: 701dc81e74 ("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>
History 2020-06-16 13:44:05 +02:00
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Linux kernel
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