Once stop_machine() is gone from the CPU offline path, we won't be able to depend on disabling preemption to prevent CPUs from going offline from under us.
Use the get/put_online_cpus_atomic() APIs to prevent CPUs from going offline, while invoking from atomic context. Cc: Mike Frysinger <[email protected]> Cc: Bob Liu <[email protected]> Cc: Steven Miao <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: [email protected] Signed-off-by: Srivatsa S. Bhat <[email protected]> --- arch/blackfin/mach-common/smp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c index 1bc2ce6..11496cd 100644 --- a/arch/blackfin/mach-common/smp.c +++ b/arch/blackfin/mach-common/smp.c @@ -238,13 +238,13 @@ void smp_send_stop(void) { cpumask_t callmap; - preempt_disable(); + get_online_cpus_atomic(); cpumask_copy(&callmap, cpu_online_mask); cpumask_clear_cpu(smp_processor_id(), &callmap); if (!cpumask_empty(&callmap)) send_ipi(&callmap, BFIN_IPI_CPU_STOP); - preempt_enable(); + put_online_cpus_atomic(); return; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
