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heap: clean up some size related issues

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First, the maximum heap size must fit in 31 bits worth of chunks
because the internal 32-bit field holding the size is shared with
the `used` bit.

Then the mention of a 256-byte block in the doc is no longer
relevant. That pertained to the previous allocator implementation.

And ditto for the HEAP_MEM_POOL_MIN_SIZE kconfig option.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
This commit is contained in:
Nicolas Pitre 2021-01-13 17:19:10 -05:00 • committed by Anas Nashif
commit 7a22a4bdf6
3 changed files with 4 additions and 17 deletions
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4
lib/os/heap.c
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@ -351,8 +351,8 @@ void *sys_heap_realloc(struct sys_heap *heap, void *ptr, size_t bytes)
void sys_heap_init(struct sys_heap *heap, void *mem, size_t bytes)
{
/* Must fit in a 32 bit count of HUNK_UNIT */
__ASSERT(bytes / CHUNK_UNIT <= 0xffffffffU, "heap size is too big");
/* Must fit in a 31 bit count of HUNK_UNIT */
__ASSERT(bytes / CHUNK_UNIT <= 0x7fffffffU, "heap size is too big");
/* Reserve the final marker chunk's header */
__ASSERT(bytes > heap_footer_bytes(bytes), "heap size is too small");