Jeremy Fitzhardinge 74260714c5 xen: lock pte pages while pinning/unpinning ... When a pagetable is created, it is made globally visible in the rmap prio tree before it is pinned via arch_dup_mmap(), and remains in the rmap tree while it is unpinned with arch_exit_mmap(). This means that other CPUs may race with the pinning/unpinning process, and see a pte between when it gets marked RO and actually pinned, causing any pte updates to fail with write-protect faults. As a result, all pte pages must be properly locked, and only unlocked once the pinning/unpinning process has finished. In order to avoid taking spinlocks for the whole pagetable - which may overflow the PREEMPT_BITS portion of preempt counter - it locks and pins each pte page individually, and then finally pins the whole pagetable. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Rik van Riel <riel@redhat.com> Cc: Hugh Dickens <hugh@veritas.com> Cc: David Rientjes <rientjes@google.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andi Kleen <ak@suse.de> Cc: Keir Fraser <keir@xensource.com> Cc: Jan Beulich <jbeulich@novell.com>		2007-10-16 11:51:30 -07:00
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boot
crypto
ia32
kernel	paravirt: clean up lazy mode handling	2007-10-16 11:51:29 -07:00
lib
mach-default
mach-es7000
mach-generic
mach-visws
mach-voyager
math-emu
mm	remove dead code in pgtable_cache_init	2007-10-16 11:51:29 -07:00
oprofile
pci
power
vdso
video
xen	xen: lock pte pages while pinning/unpinning	2007-10-16 11:51:30 -07:00