commit fed5794fccf40297f17e0032cc8211cdad0ba6df
author Takashi Iwai <tiwai@suse.de> Sun May 21 19:08:57 2017 +0200
committer Takashi Iwai <tiwai@suse.de> Fri Jun 02 19:38:26 2017 +0200
tree e6d974221c06e8e7a361758a034f528d8adedfe0
parent 13f72c8c28fc4b2d5329c940086c8939756600c2

ALSA: pcm: Build OSS writev/readv helpers conditionally

The snd_pcm_oss_writev3() and snd_pcm_oss_readv3() are used only in
io.c with CONFIG_SND_PCM_OSS_PLUGINS=y.  Add an ifdef to reduce the
build of these functions.

Along with it, since they are called always for in-kernel copy, reduce
the argument and call snd_pcm_kernel_writev() and *_readv() directly
instead.

Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>