[PATCH] sep initializing rework

[~andy/linux] / arch / i386 / kernel / smpboot.c

diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index ad74a46e9ef005aabf5cbe3ecbb1f0b4e5859f9b..c5517f3323090fceac4c8197204ccf569d34276c 100644 (file)
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -449,7 +449,18 @@ static void __init start_secondary(void *unused)
         * the local TLBs too.
         */
        local_flush_tlb();
+
+       /*
+        * We need to hold call_lock, so there is no inconsistency
+        * between the time smp_call_function() determines number of
+        * IPI receipients, and the time when the determination is made
+        * for which cpus receive the IPI. Holding this
+        * lock helps us to not include this cpu in a currently in progress
+        * smp_call_function().
+        */
+       lock_ipi_call_lock();
        cpu_set(smp_processor_id(), cpu_online_map);
+       unlock_ipi_call_lock();
 
        /* We can take interrupts now: we're officially "up". */
        local_irq_enable();