kbuild: move warnings about linux/export.h from W=1 to W=2

This hides excessive warnings, as nobody builds with W=2.

Fixes: a934a57 ("scripts/misc-check: check missing #include <linux/export.h> when W=1")
Fixes: 7d95680 ("scripts/misc-check: check unnecessary #include <linux/export.h> when W=1")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Heiko Carstens <hca@linux.ibm.com>

Author: masahir0y

Makefile

@@ -1832,12 +1832,9 @@ rustfmtcheck: rustfmt
 # Misc
 # ---------------------------------------------------------------------------
 
-# Run misc checks when ${KBUILD_EXTRA_WARN} contains 1
 PHONY += misc-check
-ifneq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
 misc-check:
 	$(Q)$(srctree)/scripts/misc-check
-endif
 
 all: misc-check
 

scripts/misc-check

@@ -62,6 +62,15 @@ check_unnecessary_include_linux_export_h () {
 	xargs -r printf "%s: warning: EXPORT_SYMBOL() is not used, but #include <linux/export.h> is present\n" >&2
 }
 
-check_tracked_ignored_files
-check_missing_include_linux_export_h
-check_unnecessary_include_linux_export_h
+case "${KBUILD_EXTRA_WARN}" in
+*1*)
+	check_tracked_ignored_files
+	;;
+esac
+
+case "${KBUILD_EXTRA_WARN}" in
+*2*)
+	check_missing_include_linux_export_h
+	check_unnecessary_include_linux_export_h
+	;;
+esac