----- On Aug 16, 2020, at 3:09 AM, Hillf Danton hdan...@sina.com wrote: > On Fri, 14 Aug 2020 12:43:57 -0400 Mathieu Desnoyers wrote: >> >> Given that no prior kthread use this guarantee and that it only affects >> kthreads, adding this guarantee does not affect user-space ABI. > > Can you expand a bit on why kthreads like ksoftirqd have to ack the > IPIs from Dave who's not CAP_SYS_ADMIN.
Do ksoftirqd kthreads ever use kthread_use_mm() to access user processes' memory ? If not, then they won't be disturbed by any IPI. Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
