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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-06-20 16:46:01 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-06-21 11:09:05 +0100
commit573619d165b85152eeddd3b3871002c48cd94e42 (patch)
treeee74480fe8ae9d09ace5cb1dd97bf1ea525249bc
parent9a00318eadbb43db4e9c163c262a22a3c8b5a672 (diff)
downloadop-kernel-dev-573619d165b85152eeddd3b3871002c48cd94e42.zip
op-kernel-dev-573619d165b85152eeddd3b3871002c48cd94e42.tar.gz
ARM: SMP: wait for CPU to be marked active
When we bring a CPU online, we should wait for it to become active before entering the idle thread, so we know that the scheduler and thread migration is going to work. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/kernel/smp.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 344e52b..e7f92a4 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -318,9 +318,13 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
smp_store_cpu_info(cpu);
/*
- * OK, now it's safe to let the boot CPU continue
+ * OK, now it's safe to let the boot CPU continue. Wait for
+ * the CPU migration code to notice that the CPU is online
+ * before we continue.
*/
set_cpu_online(cpu, true);
+ while (!cpu_active(cpu))
+ cpu_relax();
/*
* OK, it's off to the idle thread for us
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