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processor: get rid of cpu_relax_yield

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stop_machine is the only user left of cpu_relax_yield. Given that it
now has special semantics which are tied to stop_machine introduce a
weak stop_machine_yield function which architectures can override, and
get rid of the generic cpu_relax_yield implementation.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Heiko Carstens
2019-06-08 12:13:57 +02:00
parent 38f2c691a4
commit 4ecf0a43e7
5 changed files with 9 additions and 13 deletions
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7
kernel/stop_machine.c
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@@ -177,6 +177,11 @@ static void ack_state(struct multi_stop_data *msdata)
set_state(msdata, msdata->state + 1);
}
void __weak stop_machine_yield(const struct cpumask *cpumask)
{
cpu_relax();
}
/* This is the cpu_stop function which stops the CPU. */
static int multi_cpu_stop(void *data)
{
@@ -204,7 +209,7 @@ static int multi_cpu_stop(void *data)
/* Simple state machine */
do {
/* Chill out and ensure we re-read multi_stop_state. */
cpu_relax_yield(cpumask);
stop_machine_yield(cpumask);
if (msdata->state != curstate) {
curstate = msdata->state;
switch (curstate) {