From 9e4f21b927e8a81df8044806e88128388911e123 Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Sat, 1 Feb 2020 15:42:27 +0100
Subject: score: Optimize per-processor data placement

Only align per-processor data in SMP configurations.
---
 cpukit/score/src/wkspace.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'cpukit/score')

diff --git a/cpukit/score/src/wkspace.c b/cpukit/score/src/wkspace.c
index 0834438dd1..d363b8d3b2 100644
--- a/cpukit/score/src/wkspace.c
+++ b/cpukit/score/src/wkspace.c
@@ -37,7 +37,14 @@
 
 RTEMS_LINKER_RWSET(
   _Per_CPU_Data,
-  RTEMS_ALIGNED( CPU_CACHE_LINE_BYTES ) char
+#if defined(RTEMS_SMP)
+  /*
+   * In SMP configurations, prevent false cache line sharing of per-processor
+   * data with a proper alignment.
+   */
+  RTEMS_ALIGNED( CPU_CACHE_LINE_BYTES )
+#endif
+  char
 );
 
 Heap_Control _Workspace_Area;
-- 
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