diff options
author | Ingo Molnar <mingo@elte.hu> | 2008-11-11 09:16:20 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-11-11 09:16:20 +0100 |
commit | 45b86a96f17cb2900f291129b0e67287400e45b2 (patch) | |
tree | f7968bf36e3947ee42251f7eebc6ea5f24aca202 /kernel/smp.c | |
parent | 072ba49838b42c873c496d72c91bb237914cf3b6 (diff) | |
parent | 4143c5cb36331155a1823af8b3a8c761a59fed71 (diff) |
Merge branch 'devel' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/urgent
Diffstat (limited to 'kernel/smp.c')
-rw-r--r-- | kernel/smp.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/kernel/smp.c b/kernel/smp.c index f362a855377..75c8dde58c5 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -51,10 +51,6 @@ static void csd_flag_wait(struct call_single_data *data) { /* Wait for response */ do { - /* - * We need to see the flags store in the IPI handler - */ - smp_mb(); if (!(data->flags & CSD_FLAG_WAIT)) break; cpu_relax(); @@ -76,6 +72,11 @@ static void generic_exec_single(int cpu, struct call_single_data *data) list_add_tail(&data->list, &dst->list); spin_unlock_irqrestore(&dst->lock, flags); + /* + * Make the list addition visible before sending the ipi. + */ + smp_mb(); + if (ipi) arch_send_call_function_single_ipi(cpu); @@ -157,7 +158,7 @@ void generic_smp_call_function_single_interrupt(void) * Need to see other stores to list head for checking whether * list is empty without holding q->lock */ - smp_mb(); + smp_read_barrier_depends(); while (!list_empty(&q->list)) { unsigned int data_flags; @@ -191,7 +192,7 @@ void generic_smp_call_function_single_interrupt(void) /* * See comment on outer loop */ - smp_mb(); + smp_read_barrier_depends(); } } @@ -370,6 +371,11 @@ int smp_call_function_mask(cpumask_t mask, void (*func)(void *), void *info, list_add_tail_rcu(&data->csd.list, &call_function_queue); spin_unlock_irqrestore(&call_function_lock, flags); + /* + * Make the list addition visible before sending the ipi. + */ + smp_mb(); + /* Send a message to all CPUs in the map */ arch_send_call_function_ipi(mask); |