[alsa-devel] [PATCH] ASoC: max98373: usleep_range() needs include/delay.h

Mark Brown broonie at kernel.org
Fri Sep 7 14:11:28 CEST 2018


On Thu, Sep 06, 2018 at 05:27:28PM -0700, Grant Grundler wrote:
> Commit ca917f9fe1a0fab added use of usleep_range() but not
> the corresponding "include <linux/delay.h>". The result is
> with Chrome OS won't build because warnings are forced
> to be errors:
> mnt/host/source/src/third_party/kernel/v4.4/sound/soc/codecs/max98373.c:734:2: error: implicit declaration of function 'usleep_range' [-Werror,-Wimplicit-function-declaration]
>         usleep_range(10000, 11000);
>         ^

Note that this isn't causing a warning upstream, presumably due to an
implicit inclusion that isn't present in the v4.4 kernel that you appear
to be using, or gets missed due to config differences.
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