module: Unlink module with RCU synchronizing instead of stop_machine
Unlink module from module list with RCU synchronizing instead of using stop_machine(). Since module list is already protected by rcu, we don't need stop_machine() anymore. Signed-off-by: NMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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