Re: 2.6.6-rc3-mm2

[Oleg Nesterov]

Hello.

> This way only waiters must be modified, and we can use
> page_waitqueue(page) for nonfiltered wait too.

also, exclusive wakeups have no problems, and process
waiting in wait_on_page_writeback() won't be waken
by unlock_page(). it will be waken _only_ when that
bit will be cleared.

> +wake-one-pg_locked-bh_lock-semantics.patch
>
> +static void *page_key(struct page *page, unsigned long bit)
> +{
> + 	return (void *)(page_to_pfn(page) | bit << PAGE_KEY_SHIFT);
> }

become unneeded as well.

Oleg.
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