git: kernel - Rewrite the callout_*() API

[Matthew Dillon]

commit eb67213abec698ffb555ee926f2761bcb7e95f55
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Tue Mar 26 14:11:56 2019 -0700

    kernel - Rewrite the callout_*() API
    
    * Rewrite the entire API from scratch and improve compatibility
      with FreeBSD.  This is not an attempt to achieve full API compatibility,
      as FreeBSD's API has unnecessary complexity that coders would frequently
      make mistakes interpreting.
    
    * Remove the IPI mechanisms in favor of fine-grained spin-locks instead.
    
    * Add some robustness features in an attempt to track down corrupted
      callwheel lists due to originating subsystems freeing structures out
      from under an active callout.
    
    * The code supports a full-blown type-stable/adhoc-reuse structural
      separation between the front-end and the back-end, but this feature
      is currently not operational and may be removed at some future point.
      Instead we currently just embed the struct _callout inside the
      struct callout.
    
    * Replace callout_stop_sync() with callout_cancel().
    
    * callout_drain() is now implemented as a synchronous cancel instead
      of an asynchronous stop, which is closer to the FreeBSD API and
      expected operation for ported code (usb stack in particular).  We
      will just have to fix any deadlocks which we come across.
    
    * Retain our callout_terminate() function as the 'better' way to
      stop using a callout, as it will not only cancel the callout but
      also de-flag the structure so it can no longer be used.

Summary of changes:
 share/man/man9/Makefile                       |    5 +-
 share/man/man9/callout.9                      |  537 +++++++--
 sys/bus/u4b/usbdi.h                           |    2 +-
 sys/dev/crypto/rdrand/rdrand.c                |    2 +-
 sys/dev/disk/ahci/ahci.c                      |    6 +-
 sys/dev/disk/dm/delay/dm_target_delay.c       |    2 +-
 sys/dev/disk/mpt/mpt.h                        |    2 +-
 sys/dev/disk/nata/ata-all.c                   |    2 +-
 sys/dev/disk/nata/ata-lowlevel.c              |    2 +-
 sys/dev/disk/nata/ata-queue.c                 |    2 +-
 sys/dev/disk/nata/chipsets/ata-ahci.c         |    2 +-
 sys/dev/disk/nata/chipsets/ata-marvell.c      |    2 +-
 sys/dev/disk/nata/chipsets/ata-siliconimage.c |    2 +-
 sys/dev/disk/sili/sili.c                      |    4 +-
 sys/dev/drm/include/linux/workqueue.h         |    3 +-
 sys/dev/drm/linux_hrtimer.c                   |    5 +-
 sys/dev/misc/ecc/ecc_amd8000.c                |    2 +-
 sys/dev/misc/ecc/ecc_x3400.c                  |    2 +-
 sys/dev/misc/ipmi/ipmi.c                      |    2 +-
 sys/dev/misc/led/led.c                        |    2 +-
 sys/dev/misc/psm/psm.c                        |    4 +-
 sys/dev/netif/ath/ath/if_ath.c                |    8 +-
 sys/dev/netif/iwn/if_iwn.c                    |    6 +-
 sys/dev/netif/oce/oce_if.c                    |    2 +-
 sys/dev/raid/aac/aac.c                        |    2 +-
 sys/dev/raid/ciss/ciss.c                      |    2 +-
 sys/dev/raid/hptrr/hptrr_osm_bsd.c            |    2 +-
 sys/dev/raid/mfi/mfi.c                        |    2 +-
 sys/dev/raid/mps/mps.c                        |    2 +-
 sys/dev/raid/twa/tw_osl_freebsd.c             |    4 +-
 sys/dev/virtual/virtio/random/virtio_random.c |    2 +-
 sys/dev/virtual/vmware/vmxnet3/if_vmx.c       |    2 +-
 sys/kern/kern_event.c                         |   12 +-
 sys/kern/kern_exit.c                          |    2 +-
 sys/kern/kern_synch.c                         |    2 +-
 sys/kern/kern_time.c                          |    2 +-
 sys/kern/kern_timeout.c                       | 1502 +++++++++++++++----------
 sys/kern/kern_wdog.c                          |   11 +-
 sys/kern/subr_log.c                           |    2 +-
 sys/kern/subr_taskqueue.c                     |    3 +-
 sys/net/altq/altq_rmclass.c                   |    3 +-
 sys/net/ipfw/ip_fw2.c                         |   10 +-
 sys/netinet/ip_carp.c                         |    6 +-
 sys/netinet/tcp_subr.c                        |   10 +-
 sys/netinet/tcp_timer2.h                      |   12 +
 sys/netproto/802_11/README.DRAGONFLY          |    2 +-
 sys/netproto/802_11/wlan/ieee80211_dfs.c      |    4 +-
 sys/sys/callout.h                             |  252 ++---
 48 files changed, 1512 insertions(+), 949 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/eb67213abec698ffb555ee926f2761bcb7e95f55


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