"Gustavo A. R. Silva" [off-list ref] wrote:

In preparation to enable -Wimplicit-fallthrough for Clang, fix a
warning by replacing a /* fall through */ comment with the new
pseudo-keyword macro fallthrough; instead of letting the code fall
through to the next case.

Notice that Clang doesn't recognize /* fall through */ comments as
implicit fall-through markings.

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Patch applied to wireless-drivers-next.git, thanks.

10a0472d1850 iwlwifi: iwl-drv: Fix fall-through warnings for Clang

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/edd98d194bfc98b4be93a9bdc303630b719c0e66.1605896060.git.gustavoars@kernel.org/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches