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Subjectlinux-next: build warnings after merge of the staging tree
Hi Greg,

After merging the staging tree, today's linux-next build (x86_64
allmodconfig) produced these warnings:

drivers/iio/chemical/sps30.c: In function 'sps30_read_raw':
drivers/iio/chemical/sps30.c:289:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
switch (chan->channel2) {
^~~~~~
drivers/iio/chemical/sps30.c:299:3: note: here
default:
^~~~~~~
drivers/iio/chemical/sps30.c: In function 'sps30_do_cmd':
drivers/iio/chemical/sps30.c:120:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
buf[1] = (u8)SPS30_AUTO_CLEANING_PERIOD;
^
drivers/iio/chemical/sps30.c:121:2: note: here
case SPS30_READ_DATA_READY_FLAG:
^~~~

Introduced by commits

232e0f6ddeae ("iio: chemical: add support for Sensirion SPS30 sensor")
62129a0849d2 ("iio: chemical: sps30: allow changing self cleaning period")

I get this warning because I am building with -Wimplicit-fallthrough
in attempt to catch new additions early. The gcc warning can be turned
off by adding a /* fall through */ comment at the point the fall through
happens (assuming that the fall through is intentional).

--
Cheers,
Stephen Rothwell
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