kbuild: Look for module.lds under arch directory too

Forwarded: not-needed
Bug-Debian: https://bugs.debian.org/975571

The module.lds linker script is now built under the scripts directory,
where previously it was under arch/$(SRCARCH).

However, we package the scripts directory as linux-kbuild, which is
meant to be able to do support native and cross-builds.  That means it
shouldn't contain files for a specific target architecture without a
wrapper to select between them, and it doesn't appear that linker
scripts are powerful enough to implement such a wrapper.

Building module.lds in a different location would require relatively
large changes.  Moving it in the package build rules can work, but we
need to support custom kernel builds from the same source so we can't
assume it's moved.

Therefore, we move module.lds under the arch build directory in
rules.real and change Makefile.modfinal to look for it in both places.

Gbp-Pq: Topic debian
Gbp-Pq: Name kbuild-look-for-module.lds-under-arch-directory-too.patch

diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
index 35100e981f4a78b8220d7ffd895e11f695d9ad46..2dfe1fc82a8d3f2aed4e9bb8b9b8d71cd8d693c2 100644 (file)
--- a/scripts/Makefile.modfinal
+++ b/scripts/Makefile.modfinal
@@ -29,12 +29,13 @@ quiet_cmd_cc_o_c = CC [M]  $@
        $(call if_changed_dep,cc_o_c)
 
 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
+ARCH_MODULE_LDS := $(word 1,$(wildcard scripts/module.lds arch/$(SRCARCH)/module.lds))
 
 quiet_cmd_ld_ko_o = LD [M]  $@
       cmd_ld_ko_o +=                                                   \
        $(LD) -r $(KBUILD_LDFLAGS)                                      \
                $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)              \
-               -T scripts/module.lds -o $@ $(filter %.o, $^);          \
+               -T $(ARCH_MODULE_LDS) -o $@ $(filter %.o, $^);          \
        $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 
 quiet_cmd_btf_ko = BTF [M] $@
@@ -55,7 +56,7 @@ if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check),      \
        printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
 
 # Re-generate module BTFs if either module's .ko or vmlinux changed
-$(modules): %.ko: %.o %.mod.o scripts/module.lds $(if $(KBUILD_BUILTIN),vmlinux) FORCE
+$(modules): %.ko: %.o %.mod.o $(ARCH_MODULE_LDS) $(if $(KBUILD_BUILTIN),vmlinux) FORCE
        +$(call if_changed_except,ld_ko_o,vmlinux)
 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
        +$(if $(newer-prereqs),$(call cmd,btf_ko))