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A single fix for stop machine. Mark functions no trace to prevent a crash

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caused by recursion when enabling or disabling a tracer on RISC-V (probably
 all architectures which patch through stop machine).
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Merge tag 'smp-urgent-2020-11-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull smp fix from Thomas Gleixner:
 "A single fix for stop machine.

  Mark functions no trace to prevent a crash caused by recursion when
  enabling or disabling a tracer on RISC-V (probably all architectures
  which patch through stop machine)"

* tag 'smp-urgent-2020-11-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  stop_machine, rcu: Mark functions as notrace
This commit is contained in:
Linus Torvalds 2020-11-01 11:11:38 -08:00
commit 82423b46fc
2 changed files with 2 additions and 2 deletions
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2
kernel/rcu/tree.c
View File

@ -409,7 +409,7 @@ bool rcu_eqs_special_set(int cpu)
*
* The caller must have disabled interrupts and must not be idle.
*/
void rcu_momentary_dyntick_idle(void)
notrace void rcu_momentary_dyntick_idle(void)
{
int special;

2
kernel/stop_machine.c
View File

@ -178,7 +178,7 @@ static void ack_state(struct multi_stop_data *msdata)
set_state(msdata, msdata->state + 1);
}
void __weak stop_machine_yield(const struct cpumask *cpumask)
notrace void __weak stop_machine_yield(const struct cpumask *cpumask)
{
cpu_relax();
}