compatibility - fallthrough' pseudo keyword was introduced in v5.4

commit 294f69e662d1570703e9b56e95be37a9fd3afba5 Author: Joe Perches <[email protected]> Date: Sat Oct 5 09:46:42 2019 -0700 compiler_attributes.h: Add 'fallthrough' pseudo keyword for switch/case use
respeaker · Apr 27, 2020 · 0ed11aa · 0ed11aa
1 parent 74d65bf
commit 0ed11aa
Showing 1 changed file with 8 additions and 0 deletions.
diff --git 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