stop_machine, rcu: Mark functions as notrace
Some architectures assume that the stopped CPUs don't make function calls to traceable functions when they are in the stopped state. See also commit cb9d7fd5 ("watchdog: Mark watchdog touch functions as notrace"). Violating this assumption causes kernel crashes when switching tracer on RISC-V. Mark rcu_momentary_dyntick_idle() and stop_machine_yield() notrace to prevent this. Fixes: 4ecf0a43 ("processor: get rid of cpu_relax_yield") Fixes: 366237e7 ("stop_machine: Provide RCU quiescent state in multi_cpu_stop()") Signed-off-by:Zong Li <zong.li@sifive.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Tested-by:
Atish Patra <atish.patra@wdc.com> Tested-by:
Colin Ian King <colin.king@canonical.com> Acked-by:
Steven Rostedt (VMware) <rostedt@goodmis.org> Acked-by:
Paul E. McKenney <paulmck@kernel.org> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20201021073839.43935-1-zong.li@sifive.com
parent
3650b228
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