Commits
Jacob Keller committed 759dc4a7e60
i40e: initialize our affinity_mask based on cpu_possible_mask On older kernels a call to irq_set_affinity_hint does not guarantee that the IRQ affinity will be set. If nothing else on the system sets the IRQ affinity this can result in a bug in the i40e_napi_poll() routine where we notice that our interrupt fired on the "wrong" CPU according to our internal affinity_mask variable. This results in a bug where we continuously tell NAPI to stop polling to move the interrupt to a new CPU, but the CPU never changes because our affinity mask does not match the actual mask setup for the IRQ. The root problem is a mismatched affinity mask value. So lets initialize the value to cpu_possible_mask instead. This ensures that prior to the first time we get an IRQ affinity notification we'll have the mask set to include every possible CPU. We use cpu_possible_mask instead of cpu_online_mask since the former is almost certainly never going to change, while the later might change after we've made a copy. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>