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Zong Li
ffc1b64ca3
commit4230e2deaaupstream. Some architectures assume that the stopped CPUs don't make function calls to traceable functions when they are in the stopped state. See also commitcb9d7fd51d("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:4ecf0a43e7("processor: get rid of cpu_relax_yield") Fixes:366237e7b0("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 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>