CVS commit: src/sys/arch/xen/xen

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Sat Feb 25 00:33:39 UTC 2023

Modified Files:
        src/sys/arch/xen/xen: xencons.c

Log Message:
xencons(4): Reduce unnecessary membars.

- xencons_handler: After advancing in_cons, only need one xen_wmb
  before notifying the hypervisor that we're ready for more.

  (XXX Should this do xen_mb and re-check in_prod at that point, or
  does hypervisor_notify_via_evtchn obviate the need for this?)

- xenvonscn_getc: After reading in_prod, only need one xen_rmb before
  using the slots it is telling us are now ready.


To generate a diff of this commit:
cvs rdiff -u -r1.51 -r1.52 src/sys/arch/xen/xen/xencons.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.