signal: Document the RCU protection of ->sighand
__cleanup_sighand() frees sighand without RCU grace period. This is correct but this looks "obviously buggy" and constantly confuses the readers, add the comments to explain how this works. Signed-off-by:Oleg Nesterov <oleg@redhat.com> Reviewed-by:
Steven Rostedt <rostedt@goodmis.org> Reviewed-by:
Rik van Riel <riel@redhat.com> Signed-off-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by:
Pranith Kumar <bobby.prani@gmail.com>
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