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Subject[patch 04/12] clockevent unbind: use smp_call_func_single_fail
Convert clockevents_unbind from smp_call_function_single
to smp_call_func_single_fail, which will fail in case
the target CPU is tagged as block interference CPU.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: linux-isolation/kernel/time/clockevents.c
===================================================================
--- linux-isolation.orig/kernel/time/clockevents.c
+++ linux-isolation/kernel/time/clockevents.c
@@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/smp.h>
#include <linux/device.h>
+#include <linux/sched/isolation.h>

#include "tick-internal.h"

@@ -416,9 +417,14 @@ static void __clockevents_unbind(void *a
*/
static int clockevents_unbind(struct clock_event_device *ced, int cpu)
{
+ int ret, idx;
struct ce_unbind cu = { .ce = ced, .res = -ENODEV };

- smp_call_function_single(cpu, __clockevents_unbind, &cu, 1);
+ idx = block_interf_srcu_read_lock();
+ ret = smp_call_function_single_fail(cpu, __clockevents_unbind, &cu, 1);
+ block_interf_srcu_read_unlock(idx);
+ if (ret)
+ return ret;
return cu.res;
}



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