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ALSA: pcm: More constifications 

Apply const prefix to more possible places: the string tables for PCM
format and co, the table for the PCM type helpers, etc.

Just for minor optimization and no functional changes.

Link: https://lore.kernel.org/r/20200105144823.29547-6-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2020-01-05 15:47:20 +01:00
parent d64e7f7c9e
commit d03af9b8ea
3 changed files with 10 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
sound/core/pcm.c
View File

@ -163,7 +163,7 @@ static int snd_pcm_control_ioctl(struct snd_card *card,
#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
static char *snd_pcm_format_names[] = {
static const char * const snd_pcm_format_names[] = {
FORMAT(S8),
FORMAT(U8),
FORMAT(S16_LE),
@ -237,12 +237,12 @@ EXPORT_SYMBOL_GPL(snd_pcm_format_name);
#define START(v) [SNDRV_PCM_START_##v] = #v
#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
static char *snd_pcm_stream_names[] = {
static const char * const snd_pcm_stream_names[] = {
STREAM(PLAYBACK),
STREAM(CAPTURE),
};
static char *snd_pcm_state_names[] = {
static const char * const snd_pcm_state_names[] = {
STATE(OPEN),
STATE(SETUP),
STATE(PREPARED),
@ -253,7 +253,7 @@ static char *snd_pcm_state_names[] = {
STATE(SUSPENDED),
};
static char *snd_pcm_access_names[] = {
static const char * const snd_pcm_access_names[] = {
ACCESS(MMAP_INTERLEAVED),
ACCESS(MMAP_NONINTERLEAVED),
ACCESS(MMAP_COMPLEX),
@ -261,11 +261,11 @@ static char *snd_pcm_access_names[] = {
ACCESS(RW_NONINTERLEAVED),
};
static char *snd_pcm_subformat_names[] = {
static const char * const snd_pcm_subformat_names[] = {
SUBFORMAT(STD),
};
static char *snd_pcm_tstamp_mode_names[] = {
static const char * const snd_pcm_tstamp_mode_names[] = {
TSTAMP(NONE),
TSTAMP(ENABLE),
};

2
sound/core/pcm_lib.c
View File

@ -1452,7 +1452,7 @@ EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
{
static unsigned int pow2_sizes[] = {
static const unsigned int pow2_sizes[] = {
1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,

5
sound/core/pcm_misc.c
View File

@ -42,7 +42,7 @@ struct pcm_format_data {
/* we do lots of calculations on snd_pcm_format_t; shut up sparse */
#define INT __force int
static struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
static const struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
[SNDRV_PCM_FORMAT_S8] = {
.width = 8, .phys = 8, .le = -1, .signd = 1,
.silence = {},
@ -415,7 +415,8 @@ EXPORT_SYMBOL(snd_pcm_format_silence_64);
int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
{
int width;
unsigned char *dst, *pat;
unsigned char *dst;
const unsigned char *pat;
if ((INT)format < 0 || (INT)format > (INT)SNDRV_PCM_FORMAT_LAST)
return -EINVAL;