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mm_initialize: malloc() return aligend pointer.

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malloc() should return aligned (with MM_MIN_CHUNK) pointer, but
pr #5906 destroy that, this pr find a better method to solve
these questions.

Signed-off-by: YAMAMOTO Takashi <yamamoto@midokura.com>
and
Signed-off-by: wangbowen6 <wangbowen6@xiaomi.com>
This commit is contained in:
wangbowen6 2022-04-08 18:12:11 +08:00 committed by Xiang Xiao
parent 1a4ccd2d70
commit d4978bfba4
1 changed files with 7 additions and 3 deletions
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10
mm/mm_heap/mm_initialize.c
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@ -93,11 +93,15 @@ void mm_addregion(FAR struct mm_heap_s *heap, FAR void *heapstart,
DEBUGVERIFY(mm_takesemaphore(heap));
/* Adjust the provided heap start and size so that they are both aligned
* with the MM_MIN_CHUNK size.
/* Adjust the provided heap start and size.
*
* Note: (uintptr_t)node + SIZEOF_MM_ALLOCNODE is what's actually
* returned to the malloc user, which should have natural alignment.
* (that is, in this implementation, MM_MIN_CHUNK-alignment.)
*/
heapbase = MM_ALIGN_UP((uintptr_t)heapstart);
heapbase = MM_ALIGN_UP((uintptr_t)heapstart + 2 * SIZEOF_MM_ALLOCNODE) -
2 * SIZEOF_MM_ALLOCNODE;
heapend = MM_ALIGN_DOWN((uintptr_t)heapstart + (uintptr_t)heapsize);
heapsize = heapend - heapbase;