Re: DRM-current-kmod is still a problem at r353339

> Another (semi-fixed!) data point -- I can confirm that with if
> (vm_page_sleep_if_busy(page, "linuxkpi"))
>  -> if (!vm_page_busy_acquire(page, VM_ALLOC_WAITFAIL)) change and
> mjg_at_'s earlier patch at
> https://people.freebsd.org/~mjg/pmap-fict-invl.diff (please commit it) ,
> the latest drm-v5.0 branch of drm-current-kmod worked just fine with
> Intel HD Graphics P630 on Lenovo P51.

  Thank you very good information.

  As I was updated from r352923(1300048) to r353722M(1300053) with
https://people.freebsd.org/~mjg/pmap-fict-invl.diff, it can good
working with drm-current-kmod with i5-7500 desktop machine.
  Without https://people.freebsd.org/~mjg/pmap-fict-invl.diff patch,
drm-current-kmod is loaded success fully, but when starting xorg,
drm-current-kmod was paniced as follows. (The following syslog was
on i7-4500U notebook machine on r352923.)

kernel: WARNING !drm_modeset_is_locked(&crtc->mutex) failed at /usr/local/sys/modules/drm-current-kmod/drivers/gpu/drm/drm_atomic_helper.c:577
syslogd: last message repeated 2 times
kernel: WARNING !drm_modeset_is_locked(&dev->mode_config.connection_mutex) failed at /usr/local/sys/modules/drm-current-kmod/drivers/gpu/drm/drm_atomic_helper.c:622
kernel: WARNING !drm_modeset_is_locked(&plane->mutex) failed at /usr/local/sys/modules/drm-current-kmod/drivers/gpu/drm/drm_atomic_helper.c:821
syslogd: last message repeated 8 times
kernel: WARN_ON(!mutex_is_locked(&dev->struct_mutex))
kernel: WARN_ON(!mutex_is_locked(&fbc->lock))WARN_ON(!mutex_is_locked(&fbc->lock))WARN_ON(!mutex_is_locked(&fbc->lock))
kernel: panic: handle_workitem_remove: DIRCHG and worklist not empty.
kernel: cpuid = 2
kernel: time = 1571387388
kernel: KDB: stack backtrace:
kernel: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0060c4e860
kernel: vpanic() at vpanic+0x19d/frame 0xfffffe0060c4e8b0
kernel: panic() at panic+0x43/frame 0xfffffe0060c4e910
kernel: handle_workitem_remove() at handle_workitem_remove+0x607/frame 0xfffffe0060c4e980
kernel: process_worklist_item() at process_worklist_item+0x270/frame 0xfffffe0060c4ea00
kernel: softdep_process_worklist() at softdep_process_worklist+0xb2/frame 0xfffffe0060c4ea40
kernel: softdep_flush() at softdep_flush+0xef/frame 0xfffffe0060c4ea70
kernel: fork_exit() at fork_exit+0x84/frame 0xfffffe0060c4eab0
kernel: fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0060c4eab0
kernel: --- trap 0, rip = 0, rsp = 0, rbp = 0 ---
kernel: Uptime: 11h21m3s
kernel: Dumping 874 out of 8058 MB:..2%..11%..21%..32%..41%..52%..61%..72%..81%..92%
-- 
Masachika ISHIZUKA