git: kernel - Document vm_map_lookup_entry() better in vm/vm_map.c

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxxxxx>]

commit aacb506b9777fdcdbcea0fef410343c427d631ed
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date:   Fri Nov 18 08:14:16 2011 -0800

    kernel - Document vm_map_lookup_entry() better in vm/vm_map.c
    
    * Add some additional code documentation.
    
    * Issue a required cpu_ccfence() after a variable load when checking the
      vm_map_entry hint.  With the map locked shared the hint can still be
      updated concurrently even though the value, once loaded, will point to
      a stable structure.

Summary of changes:
 sys/vm/vm_map.c |   17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/aacb506b9777fdcdbcea0fef410343c427d631ed


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