diff options
| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2019-06-08 12:13:57 +0200 |
|---|---|---|
| committer | Heiko Carstens <heiko.carstens@de.ibm.com> | 2019-06-15 12:25:55 +0200 |
| commit | 4ecf0a43e729a7e641d800c294faabe87378fc05 (patch) | |
| tree | d7c164a2215c69a17b319076b64dd99ea1f85351 /kernel | |
| parent | s390: improve wait logic of stop_machine (diff) | |
| download | linux-dev-4ecf0a43e729a7e641d800c294faabe87378fc05.tar.xz linux-dev-4ecf0a43e729a7e641d800c294faabe87378fc05.zip | |
processor: get rid of cpu_relax_yield
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/stop_machine.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c index b8b0c5ff8da9..b4f83f7bdf86 100644 --- a/kernel/stop_machine.c +++ b/kernel/stop_machine.c @@ -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) { |