On 13 January 2012 16:34, Paolo Bonzini <pbonz...@redhat.com> wrote: > The main advantage of circular lists (the fact that the head node > has the same memory layout as any other node) is completely negated > by the implementation in qemu-queue.h. Not surprisingly, nobody > uses QCIRCLEQ. While this might change if RCU is ever adopted by > QEMU, the QLIST is also RCU-friendly and in fact it is used in a > RCU-like manner by 9pfs already. So, just kill QCIRCLEQ.
Kirk McKusick on why CIRCLEQ existed in the first place and why BSD still has it: http://markmail.org/message/i5oir4jhmkopjzy5 ...basically just legacy back-compat. So it's fine for us to drop it from QEMU, since we have nothing to be back-compat with. -- PMM
