Re: [PATCH] ALSA: drivers: make array 'names' const, reduces object code size

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Hi,

On Nov 27 2017 21:58, Colin King wrote:
From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

Don't populate array 'names' on the stack but instead make them static.
Makes the object code smaller by 50 bytes:

Before:
    text	   data	    bss	    dec	    hex	filename
   21237	   9192	   1120	  31549	   7b3d	linux/sound/drivers/dummy.o

After:
    text	   data	    bss	    dec	    hex	filename
   21095	   9280	   1120	  31495	   7b07	linux/sound/drivers/dummy.o

(gcc version 7.2.0 x86_64)

Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
  sound/drivers/dummy.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c
index 7b2b1f766b00..69db45bc0197 100644
--- a/sound/drivers/dummy.c
+++ b/sound/drivers/dummy.c
@@ -830,7 +830,7 @@ static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_el
  static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
  				struct snd_ctl_elem_info *info)
  {
-	const char *const names[] = { "None", "CD Player" };
+	static const char *const names[] = { "None", "CD Player" };
return snd_ctl_enum_info(info, 1, 2, names);
  }

Total size of snd-dummy.ko increases but this patch has an advantage to have the symbol in read-only section. This looks good to me.

Reviewed-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>

Another issue is addressed by the others, but here I focus on the original intention of this patch.


Thanks

Takashi Sakamoto
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