From 39eaeefb78f36724adbdc47400d6f60372b68344 Mon Sep 17 00:00:00 2001
From: Jiuzhu Dong <dongjiuzhu1@xiaomi.com>
Date: Thu, 27 Jan 2022 12:17:20 +0800
Subject: [PATCH] mm/mm_heap: remove the unnecessary check for memory node size

Signed-off-by: Jiuzhu Dong <dongjiuzhu1@xiaomi.com>
---
 mm/mm_heap/mm.h            | 37 +++++++++++++++++--------------------
 mm/mm_heap/mm_initialize.c |  9 ---------
 2 files changed, 17 insertions(+), 29 deletions(-)

diff --git a/mm/mm_heap/mm.h b/mm/mm_heap/mm.h
index 4726acb29b..1d7219dcaa 100644
--- a/mm/mm_heap/mm.h
+++ b/mm/mm_heap/mm.h
@@ -29,6 +29,7 @@
 
 #include <nuttx/fs/procfs.h>
 
+#include <assert.h>
 #include <sys/types.h>
 #include <stdbool.h>
 #include <string.h>
@@ -103,12 +104,23 @@
 
 #ifdef CONFIG_MM_SMALL
 # define MM_ALLOC_BIT    0x8000
+# define MMSIZE_MAX      UINT16_MAX
 #else
 # define MM_ALLOC_BIT    0x80000000
+# define MMSIZE_MAX      UINT32_MAX
 #endif
+
 #define MM_IS_ALLOCATED(n) \
   ((int)((FAR struct mm_allocnode_s *)(n)->preceding) < 0)
 
+/* What is the size of the allocnode? */
+
+#define SIZEOF_MM_ALLOCNODE sizeof(struct mm_allocnode_s)
+
+/* What is the size of the freenode? */
+
+#define SIZEOF_MM_FREENODE sizeof(struct mm_freenode_s)
+
 /****************************************************************************
  * Public Types
  ****************************************************************************/
@@ -117,10 +129,8 @@
 
 #ifdef CONFIG_MM_SMALL
 typedef uint16_t mmsize_t;
-#  define MMSIZE_MAX UINT16_MAX
 #else
 typedef uint32_t mmsize_t;
-#  define MMSIZE_MAX UINT32_MAX
 #endif
 
 /* This describes an allocated chunk.  An allocated chunk is
@@ -134,16 +144,8 @@ struct mm_allocnode_s
   mmsize_t preceding;      /* Size of the preceding chunk */
 };
 
-/* What is the size of the allocnode? */
-
-#ifdef CONFIG_MM_SMALL
-# define SIZEOF_MM_ALLOCNODE   (4)
-#else
-# define SIZEOF_MM_ALLOCNODE   (8)
-#endif
-
-#define CHECK_ALLOCNODE_SIZE \
-  DEBUGASSERT(sizeof(struct mm_allocnode_s) == SIZEOF_MM_ALLOCNODE)
+static_assert(SIZEOF_MM_ALLOCNODE <= MM_MIN_CHUNK,
+              "Error size for struct mm_allocnode_s\n");
 
 /* This describes a free chunk */
 
@@ -155,19 +157,14 @@ struct mm_freenode_s
   FAR struct mm_freenode_s *blink;
 };
 
+static_assert(SIZEOF_MM_FREENODE <= MM_MIN_CHUNK,
+              "Error size for struct mm_freenode_s\n");
+
 struct mm_delaynode_s
 {
   FAR struct mm_delaynode_s *flink;
 };
 
-/* What is the size of the freenode? */
-
-#define MM_PTR_SIZE sizeof(FAR struct mm_freenode_s *)
-#define SIZEOF_MM_FREENODE (SIZEOF_MM_ALLOCNODE + 2*MM_PTR_SIZE)
-
-#define CHECK_FREENODE_SIZE \
-  DEBUGASSERT(sizeof(struct mm_freenode_s) == SIZEOF_MM_FREENODE)
-
 /* This describes one heap (possibly with multiple regions) */
 
 struct mm_heap_s
diff --git a/mm/mm_heap/mm_initialize.c b/mm/mm_heap/mm_initialize.c
index 4e2a21b658..bf84db41c1 100644
--- a/mm/mm_heap/mm_initialize.c
+++ b/mm/mm_heap/mm_initialize.c
@@ -182,15 +182,6 @@ FAR struct mm_heap_s *mm_initialize(FAR const char *name,
   heapsize -= sizeof(struct mm_heap_s);
   heapstart = (FAR char *)heap_adj + sizeof(struct mm_heap_s);
 
-  /* The following two lines have cause problems for some older ZiLog
-   * compilers in the past (but not the more recent).  Life is easier if we
-   * just the suppress them altogther for those tools.
-   */
-
-#ifndef __ZILOG__
-  CHECK_ALLOCNODE_SIZE;
-  CHECK_FREENODE_SIZE;
-#endif
   DEBUGASSERT(MM_MIN_CHUNK >= SIZEOF_MM_FREENODE);
   DEBUGASSERT(MM_MIN_CHUNK >= SIZEOF_MM_ALLOCNODE);