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/* SPDX-License-Identifier: GPL-2.0-only */
#include <commonlib/helpers.h>
#include <commonlib/mem_pool.h>
void *mem_pool_alloc(struct mem_pool *mp, size_t sz)
{
void *p;
/* Make all allocations be at least 8 byte aligned. */
sz = ALIGN_UP(sz, 8);
/* Determine if any space available. */
if ((mp->size - mp->free_offset) < sz)
return NULL;
p = &mp->buf[mp->free_offset];
mp->free_offset += sz;
mp->second_to_last_alloc = mp->last_alloc;
mp->last_alloc = p;
return p;
}
void mem_pool_free(struct mem_pool *mp, void *p)
{
/* Determine if p was the most recent allocation. */
if (p == NULL || mp->last_alloc != p)
return;
mp->free_offset = mp->last_alloc - mp->buf;
mp->last_alloc = mp->second_to_last_alloc;
/* No way to track allocation before this one. */
mp->second_to_last_alloc = NULL;
}
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