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Add the mm_cid field to the rseq_update event, allowing tracers to follow which mm_cid is observed by user-space, and whether negative mm_cid values are visible in case of internal scheduler implementation issues. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20221122203932.231377-22-mathieu.desnoyers@efficios.com