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sys: util: use BITS_PER_BYTE macro instead of the magic number 8

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Obviously, everyone knows that there are 8 bits per byte, so
there isn't a lot of magic happening, per se, but it's also
helpful to clearly denote where the magic number 8 is referring
to the number of bits in a byte.

Occasionally, 8 will refer to a field size or offset in a
structure, MMR, or word. Occasionally, the number 8 will refer
to the number of bytes in a 64-bit value (which should probably
be replaced with `sizeof(uint64_t)`).

For converting bits to bytes, or vice-versa, let's use
`BITS_PER_BYTE` for clarity (or other appropriate `BITS_PER_*`
macros).

Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
This commit is contained in:
Chris Friedt 2024-11-03 10:08:19 -05:00 • committed by Anas Nashif
commit 9504034733
14 changed files with 25 additions and 22 deletions
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2
drivers/display/display_mcux_dcnano_lcdif.c
View file

@ -257,7 +257,7 @@ static const struct display_driver_api mcux_dcnano_lcdif_api = {
};
#define MCUX_DCNANO_LCDIF_PIXEL_BYTES(n) \
(DISPLAY_BITS_PER_PIXEL(DT_INST_PROP(n, pixel_format)) / 8)
(DISPLAY_BITS_PER_PIXEL(DT_INST_PROP(n, pixel_format)) / BITS_PER_BYTE)
#define MCUX_DCNANO_LCDIF_FB_SIZE(n) DT_INST_PROP(n, width) * \
DT_INST_PROP(n, height) * MCUX_DCNANO_LCDIF_PIXEL_BYTES(n)

2
drivers/display/display_mcux_elcdif.c
View file

@ -247,7 +247,7 @@ static int mcux_elcdif_set_pixel_format(const struct device *dev,
}
dev_data->pixel_format = pixel_format;
dev_data->pixel_bytes = DISPLAY_BITS_PER_PIXEL(pixel_format) / 8;
dev_data->pixel_bytes = DISPLAY_BITS_PER_PIXEL(pixel_format) / BITS_PER_BYTE;
dev_data->fb_bytes =
config->rgb_mode.panelWidth * config->rgb_mode.panelHeight * dev_data->pixel_bytes;

2
drivers/display/display_renesas_lcdc.c
View file

@ -45,7 +45,7 @@ LOG_MODULE_REGISTER(smartbond_display, CONFIG_DISPLAY_LOG_LEVEL);
LCDC_LCDC_LAYER0_OFFSETX_REG_ ## _field ## _Msk)
#define DISPLAY_SMARTBOND_PIXEL_SIZE(inst) \
(DISPLAY_BITS_PER_PIXEL(DT_INST_PROP(inst, pixel_format)) / 8)
(DISPLAY_BITS_PER_PIXEL(DT_INST_PROP(inst, pixel_format)) / BITS_PER_BYTE)
#if CONFIG_DISPLAY_RENESAS_LCDC_BUFFER_PSRAM
#define DISPLAY_BUFFER_LINKER_SECTION \

2
drivers/mipi_dbi/mipi_dbi_smartbond.c
View file

@ -338,7 +338,7 @@ static int mipi_dbi_smartbond_write_display(const struct device *dev,
lcdc_smartbond_mipi_dbi_cfg mipi_dbi_cfg;
uint8_t layer_color = lcdc_smartbond_pixel_to_lcm(pixfmt);
if (desc->width * desc->height * (DISPLAY_BITS_PER_PIXEL(pixfmt) / 8) !=
if (desc->width * desc->height * (DISPLAY_BITS_PER_PIXEL(pixfmt) / BITS_PER_BYTE) !=
desc->buf_size) {
LOG_ERR("Incorrect buffer size for given width and height");
return -EINVAL;

2
include/zephyr/sys/atomic.h
View file

@ -73,7 +73,7 @@ extern "C" {
* @cond INTERNAL_HIDDEN
*/
#define ATOMIC_BITS (sizeof(atomic_val_t) * 8)
#define ATOMIC_BITS (sizeof(atomic_val_t) * BITS_PER_BYTE)
#define ATOMIC_MASK(bit) BIT((unsigned long)(bit) & (ATOMIC_BITS - 1U))
#define ATOMIC_ELEM(addr, bit) ((addr) + ((bit) / ATOMIC_BITS))

4
include/zephyr/sys/rb.h
View file

@ -66,8 +66,8 @@ struct rbnode {
* packed binary tree, plus root... Works out to 59 entries for 32
* bit pointers and 121 at 64 bits.
*/
#define Z_TBITS(t) ((sizeof(t)) < 8 ? 2 : 3)
#define Z_PBITS(t) (8 * sizeof(t))
#define Z_TBITS(t) ((sizeof(t)) < sizeof(uint64_t) ? 2 : 3)
#define Z_PBITS(t) (BITS_PER_BYTE * sizeof(t))
#define Z_MAX_RBTREE_DEPTH (2 * (Z_PBITS(int *) - Z_TBITS(int *) - 1) + 1)
/**

2
include/zephyr/sys/util.h
View file

@ -30,7 +30,7 @@
#include <stdint.h>
/** @brief Number of bits that make up a type */
#define NUM_BITS(t) (sizeof(t) * 8)
#define NUM_BITS(t) (sizeof(t) * BITS_PER_BYTE)
#ifdef __cplusplus
extern "C" {

3
kernel/userspace.c
View file

@ -20,6 +20,7 @@
#include <zephyr/app_memory/app_memdomain.h>
#include <zephyr/sys/libc-hooks.h>
#include <zephyr/sys/mutex.h>
#include <zephyr/sys/util.h>
#include <inttypes.h>
#include <zephyr/linker/linker-defs.h>
@ -71,7 +72,7 @@ static struct k_spinlock objfree_lock; /* k_object_free */
#endif /* CONFIG_DYNAMIC_OBJECTS */
static struct k_spinlock obj_lock; /* kobj struct data */
#define MAX_THREAD_BITS (CONFIG_MAX_THREAD_BYTES * 8)
#define MAX_THREAD_BITS (CONFIG_MAX_THREAD_BYTES * BITS_PER_BYTE)
#ifdef CONFIG_DYNAMIC_OBJECTS
extern uint8_t _thread_idx_map[CONFIG_MAX_THREAD_BYTES];

3
samples/subsys/input/draw_touch_events/src/main.c
View file

@ -9,6 +9,7 @@
#include <zephyr/device.h>
#include <zephyr/input/input.h>
#include <zephyr/drivers/display.h>
#include <zephyr/sys/util.h>
LOG_MODULE_REGISTER(sample, LOG_LEVEL_INF);
@ -25,7 +26,7 @@ LOG_MODULE_REGISTER(sample, LOG_LEVEL_INF);
#define CROSS_DIM (WIDTH / CONFIG_SCREEN_WIDTH_TO_CROSS_DIM)
#define PIXEL_FORMAT (DT_PROP_OR(DT_CHOSEN(zephyr_display), pixel_format, PIXEL_FORMAT_ARGB_8888))
#define BPP ((DISPLAY_BITS_PER_PIXEL(PIXEL_FORMAT)) / 8)
#define BPP ((DISPLAY_BITS_PER_PIXEL(PIXEL_FORMAT)) / BITS_PER_BYTE)
#define BUFFER_SIZE (CROSS_DIM * CROSS_DIM * BPP)
#define REFRESH_RATE 100

2
subsys/bluetooth/host/gatt.c
View file

@ -655,7 +655,7 @@ static bool cf_set_value(struct gatt_cf_cfg *cfg, const uint8_t *value, uint16_t
/* Set the bits for each octet */
for (i = 0U; i < len && i < CF_NUM_BYTES; i++) {
if (i == (CF_NUM_BYTES - 1)) {
cfg->data[i] |= value[i] & BIT_MASK(CF_NUM_BITS % 8);
cfg->data[i] |= value[i] & BIT_MASK(CF_NUM_BITS % BITS_PER_BYTE);
} else {
cfg->data[i] |= value[i];
}

3
subsys/demand_paging/eviction/lru.c
View file

@ -36,6 +36,7 @@
#include <zephyr/kernel.h>
#include <zephyr/kernel/mm/demand_paging.h>
#include <zephyr/spinlock.h>
#include <zephyr/sys/util.h>
#include <mmu.h>
#include <kernel_arch_interface.h>
@ -51,7 +52,7 @@
* boundary for best compromize between code performance and space saving.
* The extra entry is used to store head and tail indexes.
*/
#define PF_IDX_BITS ROUND_UP(LOG2CEIL(K_MEM_NUM_PAGE_FRAMES + 1), 8)
#define PF_IDX_BITS ROUND_UP(LOG2CEIL(K_MEM_NUM_PAGE_FRAMES + 1), BITS_PER_BYTE)
/* For each page frame, track the previous and next page frame in the queue. */
struct lru_pf_idx {

9
subsys/testsuite/ztest/src/ztest_mock.c
View file

@ -76,13 +76,12 @@ int snprintk(char *str, size_t size, const char *fmt, ...)
* FIXME: move to sys_io.h once the argument signature for bitmap has
* been fixed to void* or similar GH-2825
*/
#define BITS_PER_UL (8 * sizeof(unsigned long))
#define DEFINE_BITFIELD(name, bits) unsigned long(name)[DIV_ROUND_UP(bits, BITS_PER_UL)]
#define DEFINE_BITFIELD(name, bits) unsigned long(name)[DIV_ROUND_UP(bits, BITS_PER_LONG)]
static inline int sys_bitfield_find_first_clear(const unsigned long *bitmap,
const unsigned int bits)
{
const size_t words = DIV_ROUND_UP(bits, BITS_PER_UL);
const size_t words = DIV_ROUND_UP(bits, BITS_PER_LONG);
size_t cnt;
unsigned int long neg_bitmap;
@ -97,10 +96,10 @@ static inline int sys_bitfield_find_first_clear(const unsigned long *bitmap,
continue;
} else if (neg_bitmap == ~0UL) {
/* First bit is free */
return cnt * BITS_PER_UL;
return cnt * BITS_PER_LONG;
} else {
const unsigned int bit =
(cnt * BITS_PER_UL) + __builtin_ffsl(neg_bitmap) - 1;
(cnt * BITS_PER_LONG) + __builtin_ffsl(neg_bitmap) - 1;
/* Ensure first free bit is within total bits count */
if (bit < bits) {
return bit;

2
tests/kernel/mem_protect/mem_protect/src/kobject.c
View file

@ -1183,7 +1183,7 @@ ZTEST(mem_protect_kobj, test_kobj_create_out_of_memory)
#ifdef CONFIG_DYNAMIC_OBJECTS
extern uint8_t _thread_idx_map[CONFIG_MAX_THREAD_BYTES];
#define MAX_THREAD_BITS (CONFIG_MAX_THREAD_BYTES * 8)
#define MAX_THREAD_BITS (CONFIG_MAX_THREAD_BYTES * BITS_PER_BYTE)
#endif
/* @brief Test alloc thread object until out of idex

3
tests/subsys/secure_storage/psa/crypto/src/main.c
View file

@ -2,6 +2,7 @@
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/ztest.h>
#include <zephyr/sys/util.h>
#include <psa/crypto.h>
#include <psa/internal_trusted_storage.h>
#include <psa/protected_storage.h>
@ -87,7 +88,7 @@ ZTEST(secure_storage_psa_crypto, test_persistent_key_usage)
psa_status_t ret;
psa_key_attributes_t key_attributes;
psa_key_id_t key_id;
uint8_t key_material[KEY_BITS / 8];
uint8_t key_material[KEY_BITS / BITS_PER_BYTE];
fill_key_attributes(&key_attributes);
fill_data(key_material, sizeof(key_material));