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trace: Add trace_ipi_send_cpumask()

Jerome Marchand requested to merge jeromemarchand/centos-stream-9:bz2192613 into main

Linux has had tracepoints tied to IPI reception for a while, but none tied to IPI emission.

This series add tracepoints to the actual codepath sending the IPIs, which makes it possible to trace and track sources of IPI with Ftrace. This is very useful for setups where IPIs to certain CPUs are /mostly/ undesired and a source of unwanted interference (e.g. CPU isolation).

Bugzilla: https://bugzilla.redhat.com/2192613

Signed-off-by: Jerome Marchand jmarchan@redhat.com

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