kbuild: Rename Makefile.extrawarn to Makefile.warn

Since commit e88ca24 ("kbuild: consolidate warning flags in
scripts/Makefile.extrawarn"), scripts/Makefile.extrawarn contains all
warnings for the main kernel build, not just warnings enabled by the
values for W=. Rename it to scripts/Makefile.warn to make it clearer
that this Makefile is where all Kbuild warning handling should exist.

Signed-off-by: Nathan Chancellor <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Link: https://patch.msgid.link/20251023-rename-scripts-makefile-extrawarn-v1-1-8f7531542169@kernel.org
Signed-off-by: Nicolas Schier <[email protected]>

Author: nathanchance

Makefile

@@ -1084,7 +1084,7 @@ KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=)
 endif
 
 # include additional Makefiles when needed
-include-y			:= scripts/Makefile.extrawarn
+include-y			:= scripts/Makefile.warn
 include-$(CONFIG_DEBUG_INFO)	+= scripts/Makefile.debug
 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
 include-$(CONFIG_KASAN)		+= scripts/Makefile.kasan

drivers/gpu/drm/Makefile

@@ -6,7 +6,7 @@
 CFLAGS-$(CONFIG_DRM_USE_DYNAMIC_DEBUG)	+= -DDYNAMIC_DEBUG_MODULE
 
 # Unconditionally enable W=1 warnings locally
-# --- begin copy-paste W=1 warnings from scripts/Makefile.extrawarn
+# --- begin copy-paste W=1 warnings from scripts/Makefile.warn
 subdir-ccflags-y += -Wextra -Wunused -Wno-unused-parameter
 subdir-ccflags-y += $(call cc-option, -Wrestrict)
 subdir-ccflags-y += -Wmissing-format-attribute