It looks like the supplied patch is a no-op. A module parameter is
introduced with a .set function, but the parameter does not have any
write permission specified so the .set function can never execute (since
userspace won't have permission to write to the module parameter file).
module_param_cb(cq_cpulist, &cq_cpulist_ops, NULL, 0);
~~^~
This 0 provided to module_param_cb() is the octal UNIX permissions
argument to module_param_cb(). The correct value should be 0200 in this
case, to specify write-only permission.
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https://bugs.launchpad.net/bugs/1831566
Title:
[realtime app] not possible to redirect drivers/nvme IRQs from
realtime cpuset
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