From: Masahiro Yamada <yamada.masahiro@socionext.com>
Date: Thu, 15 Aug 2019 01:06:22 +0900
Subject: kbuild: rebuild modules when module linker scripts are updated
Git-commit: 10df063855822fcea3c0f51dbf534ad643d3cb1b
Patch-mainline: v5.4-rc1
References: jsc#SLE-24559

Currently, the timestamp of module linker scripts are not checked.
Add them to the dependency of modules so they are correctly rebuilt.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Jeff Mahoney <jeffm@suse.com>
---
 Makefile                 |    3 ++-
 arch/arm/Makefile        |    2 +-
 arch/arm64/Makefile      |    2 +-
 arch/ia64/Makefile       |    2 +-
 arch/m68k/Makefile       |    2 +-
 arch/parisc/Makefile     |    2 +-
 arch/powerpc/Makefile    |    2 +-
 arch/riscv/Makefile      |    2 +-
 scripts/Makefile.modpost |    5 +++--
 9 files changed, 12 insertions(+), 10 deletions(-)

--- a/Makefile
+++ b/Makefile
@@ -470,7 +470,8 @@ KBUILD_AFLAGS_KERNEL :=
 KBUILD_CFLAGS_KERNEL :=
 KBUILD_AFLAGS_MODULE  := -DMODULE
 KBUILD_CFLAGS_MODULE  := -DMODULE
-KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
+KBUILD_LDFLAGS_MODULE :=
+export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
 KBUILD_LDFLAGS :=
 GCC_PLUGINS_CFLAGS :=
 CLANG_FLAGS :=
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -17,7 +17,7 @@ KBUILD_LDFLAGS_MODULE	+= --be8
 endif
 
 ifeq ($(CONFIG_ARM_MODULE_PLTS),y)
-KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm/kernel/module.lds
+KBUILD_LDS_MODULE	+= $(srctree)/arch/arm/kernel/module.lds
 endif
 
 GZFLAGS		:=-9
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -101,7 +101,7 @@ endif
 CHECKFLAGS	+= -D__aarch64__
 
 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
-KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
+KBUILD_LDS_MODULE	+= $(srctree)/arch/arm64/kernel/module.lds
 endif
 
 # Default value
--- a/arch/ia64/Makefile
+++ b/arch/ia64/Makefile
@@ -20,7 +20,7 @@ CHECKFLAGS	+= -D__ia64=1 -D__ia64__=1 -D
 
 OBJCOPYFLAGS	:= --strip-all
 LDFLAGS_vmlinux	:= -static
-KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/ia64/module.lds
+KBUILD_LDS_MODULE += $(srctree)/arch/ia64/module.lds
 KBUILD_AFLAGS_KERNEL := -mconstant-gp
 EXTRA		:=
 
--- a/arch/m68k/Makefile
+++ b/arch/m68k/Makefile
@@ -73,7 +73,7 @@ KBUILD_AFLAGS += -D__uClinux__
 endif
 
 KBUILD_LDFLAGS := -m m68kelf
-KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/m68k/kernel/module.lds
+KBUILD_LDS_MODULE += $(srctree)/arch/m68k/kernel/module.lds
 
 ifdef CONFIG_SUN3
 LDFLAGS_vmlinux = -N
--- a/arch/parisc/Makefile
+++ b/arch/parisc/Makefile
@@ -60,7 +60,7 @@ KBUILD_CFLAGS += -DCC_USING_PATCHABLE_FU
 		 -DFTRACE_PATCHABLE_FUNCTION_SIZE=$(NOP_COUNT)
 
 CC_FLAGS_FTRACE := -fpatchable-function-entry=$(NOP_COUNT),$(shell echo $$(($(NOP_COUNT)-1)))
-KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/parisc/kernel/module.lds
+KBUILD_LDS_MODULE += $(srctree)/arch/parisc/kernel/module.lds
 endif
 
 OBJCOPY_FLAGS =-O binary -R .note -R .comment -S
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -65,7 +65,7 @@ UTS_MACHINE := $(subst $(space),,$(machi
 ifdef CONFIG_PPC32
 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
 else
-KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/powerpc/kernel/module.lds
+KBUILD_LDS_MODULE += $(srctree)/arch/powerpc/kernel/module.lds
 ifeq ($(call ld-ifversion, -ge, 225000000, y),y)
 # Have the linker provide sfpr if possible.
 # There is a corresponding test in arch/powerpc/lib/Makefile
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -52,7 +52,7 @@ ifeq ($(CONFIG_CMODEL_MEDANY),y)
 	KBUILD_CFLAGS += -mcmodel=medany
 endif
 ifeq ($(CONFIG_MODULE_SECTIONS),y)
-	KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/riscv/kernel/module.lds
+	KBUILD_LDS_MODULE += $(srctree)/arch/riscv/kernel/module.lds
 endif
 
 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -126,10 +126,11 @@ quiet_cmd_ld_ko_o = LD [M]  $@
       cmd_ld_ko_o =                                                     \
 	$(LD) -r $(KBUILD_LDFLAGS)                                      \
                  $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE)             \
-                 -o $@ $(real-prereqs) ;                                \
+                 $(addprefix -T , $(KBUILD_LDS_MODULE))                 \
+                 -o $@ $(filter %.o, $^);                               \
 	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 
-$(modules): %.ko :%.o %.mod.o FORCE
+$(modules): %.ko :%.o %.mod.o $(KBUILD_LDS_MODULE) FORCE
 	+$(call if_changed,ld_ko_o)
 
 targets += $(modules)