centos man page for unlock_page

UNLOCK_PAGE(9)						    Memory Management in Linux						    UNLOCK_PAGE(9)

NAME
       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
       mechananism 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).

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							    UNLOCK_PAGE(9)