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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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4
arch/s390/kernel/processor.c
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@@ -7,6 +7,7 @@
#define KMSG_COMPONENT "cpu"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/stop_machine.h>
#include <linux/cpufeature.h>
#include <linux/bitops.h>
#include <linux/kernel.h>
@@ -59,7 +60,7 @@ void s390_update_cpu_mhz(void)
on_each_cpu(update_cpu_mhz, NULL, 0);
}
void notrace cpu_relax_yield(const struct cpumask *cpumask)
void notrace stop_machine_yield(const struct cpumask *cpumask)
{
int cpu, this_cpu;
@@ -73,7 +74,6 @@ void notrace cpu_relax_yield(const struct cpumask *cpumask)
smp_yield_cpu(cpu);
}
}
EXPORT_SYMBOL(cpu_relax_yield);
/*
* cpu_init - initializes state that is per-CPU.