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tracing/user_events: Move pages/locks into groups to prepare for name…
…spaces In order to enable namespaces or any sort of isolation within user_events the register lock and pages need to be broken up into groups. Each event and file now has a group pointer which stores the actual pages to map, lookup data and synchronization objects. This only enables a single group that maps to init_user_ns, as IMA namespace has done. This enables user_events to start the work of supporting namespaces by walking the namespaces up to the init_user_ns. Future patches will address other user namespaces and will align to the approaches the IMA namespace uses. Link: https://lore.kernel.org/linux-kernel/20220915193221.1728029-15-stefanb@linux.ibm.com/#t Link: https://lkml.kernel.org/r/20221001001016.2832-2-beaub@linux.microsoft.com Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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