arm64: secondary_start_kernel: Remove unnecessary barrier

Remove the unnecessary smp_wmb(), which was added to make sure
that the update_cpu_boot_status() completes before we mark the
CPU online. But update_cpu_boot_status() already has dsb() (required
for the failing CPUs) to ensure the correct behavior.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Reported-by: Dennis Chen <dennis.chen@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index dc9647521c59d10a1806790307b6c3cf7c42d27e..678e0842cb3b72f891684ce502009168fc444627 100644 (file)
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -264,8 +264,6 @@ asmlinkage void secondary_start_kernel(void)
        pr_info("CPU%u: Booted secondary processor [%08x]\n",
                                         cpu, read_cpuid_id());
        update_cpu_boot_status(CPU_BOOT_SUCCESS);
-       /* Make sure the status update is visible before we complete */
-       smp_wmb();
        set_cpu_online(cpu, true);
        complete(&cpu_running);