The first block must be a proper block. Account for this in
_Heap_Area_overhead().
---
cpukit/include/rtems/score/heap.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/cpukit/include/rtems/score/heap.h
b/cpukit/include/rtems/score/heap.h
index ccc2f5c0fe..62a81cbad9 100644
--- a/cpukit/include/rtems/score/heap.h
+++ b/cpukit/include/rtems/score/heap.h
@@ -455,7 +455,13 @@ RTEMS_INLINE_ROUTINE uintptr_t _Heap_Area_overhead(
page_size = CPU_ALIGNMENT;
}
- return 2 * (page_size - 1) + HEAP_BLOCK_HEADER_SIZE;
+ /*
+ * Account for a potential alignment of the area begin address to a page
+ * boundary, the first block, and the last block. The last block consists
+ * only of a block header.
+ */
+ return page_size - 1 + _Heap_Min_block_size( page_size ) +
+ HEAP_BLOCK_HEADER_SIZE;
}
/**
--
2.26.2
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