--- /dev/null
+From 49832c819ab85b33b7a2a1429c8d067e82be2977 Mon Sep 17 00:00:00 2001
+From: Randy Dunlap <rdunlap@infradead.org>
+Date: Tue, 7 Sep 2021 15:42:02 -0700
+Subject: Makefile: use -Wno-main in the full kernel tree
+
+From: Randy Dunlap <rdunlap@infradead.org>
+
+commit 49832c819ab85b33b7a2a1429c8d067e82be2977 upstream.
+
+When using gcc (SUSE Linux) 7.5.0 (on openSUSE 15.3), I see a build
+warning:
+
+ kernel/trace/trace_osnoise.c: In function 'start_kthread':
+ kernel/trace/trace_osnoise.c:1461:8: warning: 'main' is usually a function [-Wmain]
+ void *main = osnoise_main;
+ ^~~~
+
+Quieten that warning by using "-Wno-main". It's OK to use "main" as a
+declaration name in the kernel.
+
+Build-tested on most ARCHes.
+
+[ v2: only do it for gcc, since clang doesn't have that particular warning ]
+
+Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
+Link: https://lore.kernel.org/lkml/20210813224131.25803-1-rdunlap@infradead.org/
+Suggested-by: Steven Rostedt <rostedt@goodmis.org>
+Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
+Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
+Cc: Masahiro Yamada <masahiroy@kernel.org>
+Cc: Michal Marek <michal.lkml@markovi.net>
+Cc: linux-kbuild@vger.kernel.org
+Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ Makefile | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/Makefile
++++ b/Makefile
+@@ -803,6 +803,8 @@ else
+ # Disabled for clang while comment to attribute conversion happens and
+ # https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
+ KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=5,)
++# gcc inanely warns about local variables called 'main'
++KBUILD_CFLAGS += -Wno-main
+ endif
+
+ # These warnings generated too much noise in a regular build.