git: vkernel - Fix lockup with [v]kernel due to missing ipiq signal

[Matthew Dillon]

commit 1b1e83e2450f55ba771b18d7674f99e8041d418b
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Thu Jul 28 16:16:29 2011 -0700

    vkernel - Fix lockup with [v]kernel due to missing ipiq signal
    
    * If the target ipiq has nothing but passively queued entries the target
      cpu will normally just process the ipi's on the next clock interrupt.
    
      However, if the originating cpu is forced to live-loop waiting for the
      target to the drain the target may not be aware that it needs to drain
      ASAP.
    
    * The fix is for the originating cpu to ensure that an ipi interrupt is
      sent to the target cpu before live looping.
    
    * This appears to primarily effect vkernels.
    
    Reported-by: ftigeot, tuxillo

Summary of changes:
 sys/kern/lwkt_ipiq.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/1b1e83e2450f55ba771b18d7674f99e8041d418b


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