xiaoxiang781216 commented on a change in pull request #5914:
URL: https://github.com/apache/incubator-nuttx/pull/5914#discussion_r838803259
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File path: mm/mm_heap/mm.h
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@@ -130,10 +130,10 @@
#ifdef CONFIG_MM_SMALL
# define MM_ALLOC_BIT 0x8000
-# define MMSIZE_MAX UINT16_MAX
+# define MMSIZE_MAX (UINT16_MAX >> 1)
Review comment:
it's better to move the special bit to the low end since heap always
allocate the memory at least 2bytes alignment.
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