Jeff Roberson 3cf3b4e641 Make page busy state deterministic on free. Pages must be xbusy when ... removed from objects including calls to free. Pages must not be xbusy when freed and not on an object. Strengthen assertions to match these expectations. In practice very little code had to change busy handling to meet these rules but we can now make stronger guarantees to busy holders and avoid conditionally dropping busy in free. Refine vm_page_remove() and vm_page_replace() semantics now that we have stronger guarantees about busy state. This removes redundant and potentially problematic code that has proliferated. Discussed with: markj Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D22822		2019-12-22 06:56:44 +00:00
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balloon
blkback	vfs: introduce v_irflag and make v_type smaller	2019-12-08 21:30:04 +00:00
blkfront	Implement support for online disk capacity changes.	2019-03-30 07:20:28 +00:00
console	Extract eventfilter declarations to sys/_eventfilter.h	2019-05-20 00:38:23 +00:00
control	xen/ctrl: acknowledge all control requests	2019-10-01 08:21:41 +00:00
debug	Extract eventfilter declarations to sys/_eventfilter.h	2019-05-20 00:38:23 +00:00
evtchn
gntdev	Make page busy state deterministic on free. Pages must be xbusy when	2019-12-22 06:56:44 +00:00
grant_table
netback	Remove an unneeded include of opt_sctp.h.	2019-10-11 17:23:23 +00:00
netfront
pci
pcifront
privcmd	Make page busy state deterministic on free. Pages must be xbusy when	2019-12-22 06:56:44 +00:00
pvcpu
timer
xenpci
xenstore