[rtems commit] score: Force Per_CPU_Control::executing alignment

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    a550b3f35a32e6c74c78aeda1154b1d901574168
Changeset: http://git.rtems.org/rtems/commit/?id=a550b3f35a32e6c74c78aeda1154b1d901574168

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Wed Nov 23 07:47:57 2016 +0100

score: Force Per_CPU_Control::executing alignment

This fixes the CPU ports with relaxed alignment restrictions, e.g. type
alignment is less than the type size.

Close #2822.
Close #2823.

---

 cpukit/score/include/rtems/score/percpu.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/cpukit/score/include/rtems/score/percpu.h b/cpukit/score/include/rtems/score/percpu.h
index 78196e8..3b63c7c 100644
--- a/cpukit/score/include/rtems/score/percpu.h
+++ b/cpukit/score/include/rtems/score/percpu.h
@@ -334,6 +334,13 @@ typedef struct Per_CPU_Control {
    */
   volatile bool dispatch_necessary;
 
+  /*
+   * Ensure that the executing member is at least 4-byte aligned, see
+   * PER_CPU_OFFSET_EXECUTING.  This is necessary on CPU ports with relaxed
+   * alignment restrictions, e.g. type alignment is less than the type size.
+   */
+  bool reserved_for_executing_alignment[ 3 ];
+
   /**
    * @brief This is the thread executing on this processor.
    *