On Thu, Jan 07, 2010 at 12:36:01PM +0200, Michael S. Tsirkin wrote:
> Or if I do it the other way:
> remove_wait_queue(irqfd->wqh, &irqfd->wait);
> ->
> eventfd_read_ctx(irqfd->eventfd, &ucnt);
>
> now, if device signals eventfd at point marked by ->,
> it will not be sent but counter will be cleared,
> so we will loose a message.
>
May be I am missing something here, but why doing it like that is a
problem? Event delivery races with interrupt masking so making masking
succeed before event delivery is OK. Event generation is asynchronous
anyway and could have happened jiffy latter anyway.
--
Gleb.
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