unlock_page (9) Linux Manual Page
unlock_page – unlock a locked page
Synopsis
void unlock_page(struct page *page);Arguments
page
-
- the page
Description
Unlocks the page and wakes up sleepers in ___wait_on_page_locked. Also wakes sleepers in wait_on_page_writeback because the wakeup mechanism between PageLocked pages and PageWriteback pages is shared. But that’s OK – sleepers in wait_on_page_writeback just go back to sleep.
The mb is necessary to enforce ordering between the clear_bit and the read of the waitqueue (to avoid SMP races with a parallel wait_on_page_locked).