[SCM] GNU Mach branch, master, updated. v1.5-90-g81747ac

[Justus Winter]

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- Log -----------------------------------------------------------------
commit 81747ac6d3e846d1955edaa94dee9065e541b7d8
Author: Justus Winter <address@hidden>
Date:   Mon Sep 7 13:04:39 2015 +0200

    kern: use proper memory fences when handling the mapped time
    
    * include/mach/time_value.h (struct mapped_time_value): Adjust comment.
    * kern/mach_clock.c (mtime): Likewise.  Also make it volatile.
    (update_mapped_time): Use full hardware barriers.
    (read_mapped_time): New macro with proper fences.
    (record_time_stamp, host_get_time): Use the new macro.

-----------------------------------------------------------------------

Summary of changes:
 include/mach/time_value.h |    2 ++
 kern/mach_clock.c         |   33 ++++++++++++++++++---------------
 2 files changed, 20 insertions(+), 15 deletions(-)


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