Merge branches 'btc', 'dma', 'entry', 'fixes', 'linker-layout', 'misc', 'mmci', ...

[firefly-linux-kernel-4.4.55.git] / arch / arm / kernel / smp.c

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 0ffcf5c0da4323ac6255da97b296342871babb0e..167e3cbe1f2fc815367c955c29d0a842b6059f62 100644 (file)
--- 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