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kernel/k_malloc: add k_aligned_alloc

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This change adds z_heap_aligned_alloc() and k_aligned_alloc()
and changes z_heap_malloc() and k_malloc() to be small wrappers around
the aligned variants.

Fixes #29519

Signed-off-by: Christopher Friedt <chrisfriedt@gmail.com>
This commit is contained in:
Christopher Friedt 2020-11-26 08:19:10 -05:00 • committed by Carles Cufí
commit 135ffaff74
2 changed files with 63 additions and 17 deletions
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27
include/kernel.h
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@ -4540,7 +4540,27 @@ extern void z_mem_pool_free_id(struct k_mem_block_id *id);
*/
/**
* @brief Allocate memory from heap.
* @brief Allocate memory from the heap with a specified alignment.
*
* This routine provides semantics similar to aligned_alloc(); memory is
* allocated from the heap with a specified alignment. However, one minor
* difference is that k_aligned_alloc() accepts any non-zero @p size,
* wherase aligned_alloc() only accepts a @p size that is an integral
* multiple of @p align.
*
* Above, aligned_alloc() refers to:
* C11 standard (ISO/IEC 9899:2011): 7.22.3.1
* The aligned_alloc function (p: 347-348)
*
* @param align Alignment of memory requested (in bytes).
* @param size Amount of memory requested (in bytes).
*
* @return Address of the allocated memory if successful; otherwise NULL.
*/
extern void *k_aligned_alloc(size_t align, size_t size);
/**
* @brief Allocate memory from the heap.
*
* This routine provides traditional malloc() semantics. Memory is
* allocated from the heap memory pool.
@ -4549,7 +4569,10 @@ extern void z_mem_pool_free_id(struct k_mem_block_id *id);
*
* @return Address of the allocated memory if successful; otherwise NULL.
*/
extern void *k_malloc(size_t size);
static inline void *k_malloc(size_t size)
{
return k_aligned_alloc(sizeof(void *), size);
}
/**
* @brief Free memory allocated from heap.