From 0ed11aa9a4b4c627ed98620026b23f8bb86afd5a Mon Sep 17 00:00:00 2001
From: Hin-Tak Leung <htl10@users.sourceforge.net>
Date: Mon, 27 Apr 2020 21:17:56 +0100
Subject: [PATCH] compatibility - fallthrough' pseudo keyword was introduced in
 v5.4

commit 294f69e662d1570703e9b56e95be37a9fd3afba5
Author: Joe Perches <joe@perches.com>
Date:   Sat Oct 5 09:46:42 2019 -0700

    compiler_attributes.h: Add 'fallthrough' pseudo keyword for switch/case use
---
 sound-compatible-4.18.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound-compatible-4.18.h b/sound-compatible-4.18.h
index dc5a787..faed848 100644
--- a/sound-compatible-4.18.h
+++ b/sound-compatible-4.18.h
@@ -15,6 +15,14 @@
 #define __NO_SND_SOC_CODEC_DRV     0
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5,4,0)
+#if __has_attribute(__fallthrough__)
+# define fallthrough                    __attribute__((__fallthrough__))
+#else
+# define fallthrough                    do {} while (0)  /* fallthrough */
+#endif
+#endif
+
 #if __NO_SND_SOC_CODEC_DRV
 #define codec                      component
 #define snd_soc_codec              snd_soc_component