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This is my current futex patchset against BK-curr. It mostly includes
must-have crash/correctness fixes from Martin Wirth, tested and reworked
somewhat by myself:
- crash fix: futex_close did not detach from the vcache. Detach cleanups.
(Martin Wirth)
- memory leak fix: forgotten put_page() in a rare path in __pin_page().
(Martin Wirth)
- crash fix: do not do any quickcheck in unqueue_me(). (Martin, me)
- correctness fix: the fastpath in __pin_page() now handles reserved
pages the same way get_user_pages() does. (Martin Wirth)
- queueing improvement: __attach_vcache() now uses list_add_tail() to
avoid the reversal of the futex queue if a COW happens. (Martin Wirth)
- simplified alignment check in sys_futex. (Martin Wirth)
- comment fix: make it clear how the vcache hash quickcheck works. (me)
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