Rename the KDB_STOP_NMI kernel option to STOP_NMI and make it apply to all

IPI_STOP IPIs.
- Change the i386 and amd64 MD IPI code to send an NMI if STOP_NMI is
  enabled if an attempt is made to send an IPI_STOP IPI.  If the kernel
  option is enabled, there is also a sysctl to change the behavior at
  runtime (debug.stop_cpus_with_nmi which defaults to enabled).  This
  includes removing stop_cpus_nmi() and making ipi_nmi_selected() a
  private function for i386 and amd64.
- Fix ipi_all(), ipi_all_but_self(), and ipi_self() on i386 and amd64 to
  properly handle bitmapped IPIs as well as IPI_STOP IPIs when STOP_NMI is
  enabled.
- Fix ipi_nmi_handler() to execute the restart function on the first CPU
  that is restarted making use of atomic_readandclear() rather than
  assuming that the BSP is always included in the set of restarted CPUs.
  Also, the NMI handler didn't clear the function pointer meaning that
  subsequent stop and restarts could execute the function again.
- Define a new macro HAVE_STOPPEDPCBS on i386 and amd64 to control the use
  of stoppedpcbs[] and always enable it for i386 and amd64 instead of
  being dependent on KDB_STOP_NMI.  It works fine in both the NMI and
  non-NMI cases.

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/conf/options.i386 b/sys/conf/options.i386
index 8ad0b8b..7dafd5e 100644
--- a/sys/conf/options.i386
+++ b/sys/conf/options.i386
@@ -161,5 +161,5 @@ DEV_NPX			opt_npx.h
 ASR_COMPAT		opt_asr.h
 
 # Debugging
-KDB_STOP_NMI		opt_kdb.h
+STOP_NMI		opt_cpu.h
 NPX_DEBUG		opt_npx.h