On Sun, Oct 6, 2019 at 12:54 AM kbuild test robot <lkp@intel.com> wrote:
> url:    https://github.com/0day-ci/linux/commits/Tzung-Bi-Shih/ASoC-mediatek-mt8183-mt6358-ts3a227-max98357-support-WoV/20191005-171021
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
> reproduce:
>         # apt-get install sparse
>         # sparse version: v0.6.1-rc1-42-g38eda53-dirty
>         make ARCH=x86_64 allmodconfig
>         make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
>
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@intel.com>
>
>
> sparse warnings: (new ones prefixed by >>)
>
> >> sound/soc/codecs/cros_ec_codec.c:430:39: sparse: sparse: incorrect type in return expression (different address spaces) @@    expected void * @@    got void [noderef] <asvoid * @@
> >> sound/soc/codecs/cros_ec_codec.c:430:39: sparse:    expected void *
> >> sound/soc/codecs/cros_ec_codec.c:430:39: sparse:    got void [noderef] <asn:2> *
> >> sound/soc/codecs/cros_ec_codec.c:549:69: sparse: sparse: incorrect type in argument 2 (different address spaces) @@    expected void const volatile [noderef] <asn:2> * @@    got latile [noderef] <asn:2> * @@
> >> sound/soc/codecs/cros_ec_codec.c:549:69: sparse:    expected void const volatile [noderef] <asn:2> *
> >> sound/soc/codecs/cros_ec_codec.c:549:69: sparse:    got unsigned char [usertype] *addr
> >> sound/soc/codecs/cros_ec_codec.c:698:33: sparse: sparse: incorrect type in argument 1 (different address spaces) @@    expected void volatile [noderef] <asn:2> * @@    got latile [noderef] <asn:2> * @@
> >> sound/soc/codecs/cros_ec_codec.c:698:33: sparse:    expected void volatile [noderef] <asn:2> *
> >> sound/soc/codecs/cros_ec_codec.c:698:33: sparse:    got unsigned char [usertype] *wov_lang_shm_p
>    sound/soc/codecs/cros_ec_codec.c:699:48: sparse: sparse: incorrect type in argument 1 (different address spaces) @@    expected void volatile [noderef] <asn:2> * @@    got latile [noderef] <asn:2> * @@
>    sound/soc/codecs/cros_ec_codec.c:699:48: sparse:    expected void volatile [noderef] <asn:2> *
> >> sound/soc/codecs/cros_ec_codec.c:699:48: sparse:    got unsigned char [usertype] *

I cannot reproduce the same sparse errors.

My commit stack: apply my patches onto broonie/sound.git for-next
$ git log --oneline
b4471777f5d8 (HEAD -> draft) ASoC: mediatek: mt8183: support WoV
b6bb558fa59d ASoC: dt-bindings: mt8183: add ec-codec
a08bede115d4 ASoC: mediatek: mt6358: support WoV
f67068fd0c91 ASoC: cros_ec_codec: support WoV
7e11271c070e ASoC: dt-bindings: cros_ec_codec: add SHM bindings
fd04f20e77d3 ASoC: cros_ec_codec: read max DMIC gain from EC codec
c008f01d5bc3 platform/chrome: cros_ec: add common commands for EC codec
50d2c1f9b1f4 ASoC: cros_ec_codec: extract DMIC EC command from I2S RX
00e5a1c121eb ASoC: cros_ec_codec: refactor I2S RX
3f0c475d6ec8 platform/chrome: cros_ec: remove unused EC feature
3877dcd0194c (mark/for-next, asoc-next) Merge branch 'asoc-5.5' into asoc-next

My reproduce steps:
$ make ARCH=x86_64 mrproper
$ make ARCH=x86_64 allmodconfig
$ make ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' -j40
2>&1 | grep -v sched | tee log.txt
(Note: filter sched out to not get flood sparse errors)
$ grep cros_ec_codec log.txt
  CHECK   sound/soc/codecs/cros_ec_codec.c
  CC [M]  sound/soc/codecs/cros_ec_codec.o

It did not generate the same message as 0day reported.

One difference would be the sparse version (it is from "apt install"
in my environment):
$ sparse --version
0.6.0 (Debian: 0.6.0-3)
On the other hand, 0day used "v0.6.1-rc1-42-g38eda53-dirty".

Guenter, what we could do in the case?  Do you have any idea?