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authorMichael Ellerman <mpe@ellerman.id.au>2014-12-29 15:47:05 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2014-12-29 15:51:51 +1100
commit1be6f10f6f9caade3a053938cb80a2eed237e262 (patch)
tree24a706d6feaf8f75031885f3cb92dd3c688fcc43
parentc1caae3de46a072d0855729aed6e793e536a4a55 (diff)
Revert "powerpc: Secondary CPUs must set cpu_callin_map after setting active and online"
This reverts commit 7c5c92ed56d932b2c19c3f8aea86369509407d33. Although this did fix the bug it was aimed at, it also broke secondary startup on platforms that use give/take_timebase(). Unfortunately we didn't detect that while it was in next. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
-rw-r--r--arch/powerpc/kernel/smp.c9
1 files changed, 1 insertions, 8 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 8ec017cb4446..8b2d2dc8ef10 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -700,6 +700,7 @@ void start_secondary(void *unused)
smp_store_cpu_info(cpu);
set_dec(tb_ticks_per_jiffy);
preempt_disable();
+ cpu_callin_map[cpu] = 1;
if (smp_ops->setup_cpu)
smp_ops->setup_cpu(cpu);
@@ -738,14 +739,6 @@ void start_secondary(void *unused)
notify_cpu_starting(cpu);
set_cpu_online(cpu, true);
- /*
- * CPU must be marked active and online before we signal back to the
- * master, because the scheduler needs to see the cpu_online and
- * cpu_active bits set.
- */
- smp_wmb();
- cpu_callin_map[cpu] = 1;
-
local_irq_enable();
cpu_startup_entry(CPUHP_ONLINE);