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mempool: fully use the inline free block bitmap on 64-bit targets

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The "bits" field in struct sys_mem_pool_lvl is unioned with a pointer.
That leaves more space for inline free bits on 64-bit targets.
Let's declare it as an array and adjust its size based on the pointer
size. On 32-bit targets the generated code remains identical.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
This commit is contained in:
Nicolas Pitre 2019-05-22 15:16:11 -04:00 • committed by Andrew Boie
commit fc4ca923bb
2 changed files with 7 additions and 7 deletions
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10
include/sys/mempool_base.h
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@ -18,7 +18,7 @@
struct sys_mem_pool_lvl {
union {
u32_t *bits_p;
u32_t bits;
u32_t bits[sizeof(u32_t *)/4];
};
sys_dlist_t free_list;
};
@ -67,11 +67,11 @@ struct sys_mem_pool_base {
#define Z_MPOOL_LBIT_WORDS_UNCLAMPED(n_max, l) \
((((n_max) << (2*(l))) + 31) / 32)
/* One word gets stored free unioned with the pointer, otherwise the
* calculated unclamped value
/* One or two 32-bit words gets stored free unioned with the pointer,
* otherwise the calculated unclamped value
*/
#define Z_MPOOL_LBIT_WORDS(n_max, l) \
(Z_MPOOL_LBIT_WORDS_UNCLAMPED(n_max, l) < 2 ? 0 \
#define Z_MPOOL_LBIT_WORDS(n_max, l) \
(Z_MPOOL_LBIT_WORDS_UNCLAMPED(n_max, l) <= sizeof(u32_t *)/4 ? 0 \
: Z_MPOOL_LBIT_WORDS_UNCLAMPED(n_max, l))
/* How many bytes for the bitfields of a single level? */