+What: capifs
+When: February 2011
+Files: drivers/isdn/capi/capifs.*
+Why: udev fully replaces this special file system that only contains CAPI
+ NCCI TTY device nodes. User space (pppdcapiplugin) works without
+ noticing the difference.
+Who: Jan Kiszka <jan.kiszka@web.de>
+
+----------------------------
+
+What: KVM memory aliases support
+When: July 2010
+Why: Memory aliasing support is used for speeding up guest vga access
+ through the vga windows.
+
+ Modern userspace no longer uses this feature, so it's just bitrotted
+ code and can be removed with no impact.
+Who: Avi Kivity <avi@redhat.com>
+
+----------------------------
+
+What: xtime, wall_to_monotonic
+When: 2.6.36+
+Files: kernel/time/timekeeping.c include/linux/time.h
+Why: Cleaning up timekeeping internal values. Please use
+ existing timekeeping accessor functions to access
+ the equivalent functionality.
+Who: John Stultz <johnstul@us.ibm.com>
+
+----------------------------
+
+What: KVM kernel-allocated memory slots
+When: July 2010
+Why: Since 2.6.25, kvm supports user-allocated memory slots, which are
+ much more flexible than kernel-allocated slots. All current userspace
+ supports the newer interface and this code can be removed with no
+ impact.
+Who: Avi Kivity <avi@redhat.com>
+
+----------------------------
+
+What: KVM paravirt mmu host support
+When: January 2011
+Why: The paravirt mmu host support is slower than non-paravirt mmu, both
+ on newer and older hardware. It is already not exposed to the guest,
+ and kept only for live migration purposes.
+Who: Avi Kivity <avi@redhat.com>
+
+----------------------------
+
+What: "acpi=ht" boot option