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PERCPU_MODULE_RESERVE defines the maximum size that can by used for the per-CPU data size used by modules. This is 8KiB. Commit035fcdc4d2("openvswitch: Merge three per-CPU structures into one") restructured the per-CPU memory allocation for the module and moved the separate alloc_percpu() invocations at module init time to a static per-CPU variable which is allocated by the module loader. The size of the per-CPU data section for openvswitch is 6488 bytes which is ~80% of the available per-CPU memory. Together with a few other modules it is easy to exhaust the available 8KiB of memory. Allocate ovs_pcpu_storage dynamically at module init time. Reported-by: Gal Pressman <gal@nvidia.com> Closes: https://lore.kernel.org/all/c401e017-f8db-4f57-a1cd-89beb979a277@nvidia.com Fixes:035fcdc4d2("openvswitch: Merge three per-CPU structures into one") Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by: Aaron Conole <aconole@redhat.com> Link: https://patch.msgid.link/20250613123629.-XSoQTCu@linutronix.de Signed-off-by: Paolo Abeni <pabeni@redhat.com>