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Goncalves wrote: >> In this case, corroborating with Sashiko findings, it is necessary to >> have a way to override that default in kernels with PREEMPT_RT enabled. >> To be used where this is required for firmware updates. > > Indeed. Agreed -- and thanks Luis and Steve for catching the fwupd impact. For v3 I'll make the option a negatable flag: "nostatfs" skips QueryVariableInfo() (and remains the default on PREEMPT_RT), while "statfs" forces reporting back on. So on an RT kernel, mounting efivarfs with -o statfs restores the free-space reporting that fwupd needs for KEK/DB/DBX updates, while the default still avoids the preempt-disabled firmware call. I'll send v3 with that change shortly. Thanks, Prashant