[20/37] modpost: show warning if any of symbol dump files is missing
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Message ID 20200601055731.3006266-20-masahiroy@kernel.org
State New
Headers show
Series
  • [01/37] kbuild: refactor subdir-ym calculation
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Commit Message

Masahiro Yamada June 1, 2020, 5:57 a.m. UTC
If modpost fails to load a symbol dump file, it cannot check unresolved
symbols, hence module dependency will not be added. Nor CRCs can be added.

Currently, external module builds check only $(objtree)/Module.symvers,
but it should check files specified by KBUILD_EXTRA_SYMBOLS as well.

Move the warning message from the top Makefile to scripts/Makefile.modpost
and print the warning if any dump file is missing.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

 Makefile                 | 10 +---------
 scripts/Makefile.modpost |  5 ++++-
 2 files changed, 5 insertions(+), 10 deletions(-)

Patch
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diff --git a/Makefile b/Makefile
index 6280c7597a2d..f80c4ff93ec9 100644
--- a/Makefile
+++ b/Makefile
@@ -1649,17 +1649,9 @@  else # KBUILD_EXTMOD
 # We are always building modules
 KBUILD_MODULES := 1
 
-PHONY += $(objtree)/Module.symvers
-$(objtree)/Module.symvers:
-	@test -e $(objtree)/Module.symvers || ( \
-	echo; \
-	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
-	echo "           is missing; modules will have no dependencies and modversions."; \
-	echo )
-
 build-dirs := $(KBUILD_EXTMOD)
 PHONY += modules
-modules: descend $(objtree)/Module.symvers
+modules: descend
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 
 PHONY += modules_install
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 7d564a39f938..16fe19724c34 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -97,8 +97,11 @@  ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
 MODPOST += -n
 endif
 
+# Clear VPATH to not search for *.symvers in $(srctree). Check only $(objtree).
+VPATH :=
 $(input-symdump):
-	@:
+	@echo >&2 'WARNING: Symbol version dump "$@" is missing.'
+	@echo >&2 '         Modules may not have dependencies or modversions.'
 
 # Read out modules.order to pass in modpost.
 # Otherwise, allmodconfig would fail with "Argument list too long".