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mm/mm_heap: place alloc-bit at the LSB of node->preceeding.

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Heap always allocate the memory at least 2bytes alignment.

Signed-off-by: wangbowen6 <wangbowen6@xiaomi.com>
This commit is contained in:
wangbowen6 2022-03-30 20:31:29 +08:00 committed by Petro Karashchenko
parent 44ee76dcbd
commit a0bde21f0f
1 changed files with 2 additions and 3 deletions
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5
mm/mm_heap/mm.h
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@ -124,15 +124,14 @@
#define MM_ALIGN_UP(a) (((a) + MM_GRAN_MASK) & ~MM_GRAN_MASK) #define MM_ALIGN_UP(a) (((a) + MM_GRAN_MASK) & ~MM_GRAN_MASK)
#define MM_ALIGN_DOWN(a) ((a) & ~MM_GRAN_MASK) #define MM_ALIGN_DOWN(a) ((a) & ~MM_GRAN_MASK)
/* An allocated chunk is distinguished from a free chunk by bit 31 (or 15) /* An allocated chunk is distinguished from a free chunk by bit 0
* of the 'preceding' chunk size. If set, then this is an allocated chunk. * of the 'preceding' chunk size. If set, then this is an allocated chunk.
*/ */
#define MM_ALLOC_BIT 0x1
#ifdef CONFIG_MM_SMALL #ifdef CONFIG_MM_SMALL
# define MM_ALLOC_BIT 0x8000
# define MMSIZE_MAX UINT16_MAX # define MMSIZE_MAX UINT16_MAX
#else #else
# define MM_ALLOC_BIT 0x80000000
# define MMSIZE_MAX UINT32_MAX # define MMSIZE_MAX UINT32_MAX
#endif #endif