Re: [rfc] direct IO submission and completion scalability issues

Pekka Enberg
2008-02-03T10:53:17Z

Hi Nick,

On Feb 3, 2008 11:52 AM, Nick Piggin <npiggin@suse.de> wrote:
> +asmlinkage void smp_call_function_fast_interrupt(void)
> +{

[snip]

> + while (!list_empty(&list)) {
> + struct call_single_data *data;
> +
> + data = list_entry(list.next, struct call_single_data, list);
> + list_del(&data->list);
> +
> + data->func(data->info);
> + if (data->wait) {
> + smp_mb();
> + data->wait = 0;

Why do we need smp_mb() here (maybe add a comment to keep
Andrew/checkpatch happy)?

Pekka