From: "Paul E. McKenney" <paul...@linux.vnet.ibm.com>
This commit removes the open-coded CPU-offline notification with new
common code. In particular, this change avoids calling scheduler code
using RCU from an offline CPU that RCU is ignoring. This is a minimal
change. A more intrusive change might invoke the cpu_check_up_prepare()
and cpu_set_state_online() functions at CPU-online time, which would
allow onlining throw an error if the CPU did not go offline properly.
Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
Cc: linux-arm-ker...@lists.infradead.org
Cc: Catalin Marinas <catalin.mari...@arm.com>
Cc: Will Deacon <will.dea...@arm.com>
---
arch/arm64/kernel/smp.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 328b8ce4b007..6dc727a6e73e 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -252,15 +252,13 @@ static int op_cpu_kill(unsigned int cpu)
return cpu_ops[cpu]->cpu_kill(cpu);
}
-static DECLARE_COMPLETION(cpu_died);
-
/*
* called on the thread which is asking for a CPU to be shutdown -
* waits until shutdown has completed, or it is timed out.
*/
void __cpu_die(unsigned int cpu)
{
- if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) {
+ if (!cpu_wait_death(cpu, 5)) {
pr_crit("CPU%u: cpu didn't die\n", cpu);
return;
}
@@ -293,7 +291,7 @@ void cpu_die(void)
local_irq_disable();
/* Tell __cpu_die() that this CPU is now safe to dispose of */
- complete(&cpu_died);
+ (void)cpu_report_death();
/*
* Actually shutdown the CPU. This must never fail. The specific hotplug
--
1.8.1.5
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