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   - make pipe->close method take the thread lock

   - convert usb_taskq to use mutex/cv

   - convert needs_explore usage into a cv on the thread lock

   - remove KERNEL_*LOCK from uaudio and umidi, since we're supposedly
     MPSAFE here now

   - use IPL_SCHED instead of IPL_USB (aka biglocked) interrupts

   - drop the audio thread lock when calling into usb when it may sleep,
     avoiding a deadlock between audiowrite and audioioctl.  this fixes
     mixerctl -a vs. playing hanging the system
     XXX probably need to check this in a bunch more places.

   convert the remaining wakeup(xfer)'s to use the xfer->cv.

   utoppy - untested.

   my compiles-but-un-runtime-tested port of uhci to usbmp branch.
   based upon the ohci and ehci changes.

   adapt ohci, from mrg with some changes by me

   Make ehci mpsafe.

   Split out the cross-CPU tlb flushing code between XEN and non-XEN.
   x86 tlb flushing is asynchronous and uses x86_ipi()
   XEN tlb flushing uses synchronous hypercalls.

   hypervisor_unmask_event(): don't check/update evtchn_pending_sel for the
     current CPU, but for any CPU which may accept this event.
   xen/xenevt.c: more use of atomic ops and locks where appropriate, and some
     other SMP fixes. Handle all events on the primary CPU (may be revisited
     later). Set/clear ci_evtmask[] for watched events.

   This should fix the problems on dom0 kernels reported by jym@

   xbdback_disconnect() can be called twice,  from XenbusStateClosing then from
   xbdback_xenbus_destroy(). The second call will wait forever as the first
   already caused the xbd thread to exit.
   Have xbdback_disconnect() check if we're already disconnected and if so,
   do nothing.

   If we are DIAGNOSTIC don't try to go further if we failed to take the
   lock, because we are going to trigger a KASSERT. Also hold the lock
   longer and take the proc lock for kpsignal(). Maybe we should add
   mutex_steal() and mutex_return() for the debugger? Lock correction
   suggestion from jmcneill.

   Don't try to set ld->sc_maxxfer below MAXPHYS.
   At least genfs_io assumes 'ld->sc_maxxfer == MAXPHYS'.

   the argument of esa_get_locks() is struct esa_voice *, not struct esa_softc *.

   ok by mrg@ jmcneill@

   PR/32394 -- Don't define 'panic' label unconditionally, or "minimal
   mobilepro 780 kernel configuration will not build".

   OK by wiz@

   Define NO_MANUAL_XFER on luna68k as temporary workaround for hangup problem
   during probing old drives like DK312C in OMRON LUNA machines.

   I'll check this MSGIN xfer problem later.
   (NO_MANUAL_XFER also caused hang on heavy load on hp300 with multiple drives)

   auich(4) tested on port-i386.

   - move disk cache flushing code into a separate function.
   - more verbose output if vfs.wapbl.verbose_commit >= 2.
     namely, time taken for each DIOCCACHESYNC calls.
        wapbl_flush: 1322826000.785245900 this transaction = 546304 bytes
        wapbl_cache_sync: 1: dev 0x0 0.017572724
        wapbl_cache_sync: 2: dev 0x0 0.007199825
        wapbl_flush: 1322826011.860771302 this transaction = 431104 bytes
        wapbl_cache_sync: 1: dev 0x0 0.019469753
        wapbl_cache_sync: 2: dev 0x0 0.009473410
        wapbl_flush: 1322829266.489154342 this transaction = 187904 bytes
        wapbl_cache_sync: 1: dev 0x4 0.022270180
        wapbl_cache_sync: 2: dev 0x4 0.030749402
   - fix a comment.

   assertion

   assertions

   move priority inheritance code to separate functions

   comments

   fix an indent an unwarp a short line.

   update a comment

   audio cookie is a struct auixp_codec, not auixp_softc

   Use xlat_mbr_fstype().

   Don't double clfree() when closing an interrupt endpoint.
   From Geoff C. Wing in PR#37934.

   Initialize the kern_cprng in rump startup.  Oops.

   Should fix some "mysterious" rump test failures.  Thanks to Nicholas Joly
   for pointing out exactly what was wrong.

   Increase SYMTAB_SPACE for evbmips.

   Trim down MV2120:
    - comment pci(4)-related drivers
    - comment dmover(4)-related drivers
    - optimize for size
    - add 5.0 compat
    - misc and cosmetics

   Explain the reasoning behind the load-time memory layout.
   Only build kernels the MV2120 can boot.
   Use mkubootimage -E.

   Increase SYMTAB_SPACE for evbmips.

   Only return values when there was no error.