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* [PATCH 2/3] kbuild: rebuild modules when module linker scripts are updated
       [not found] <20190814160623.24802-1-yamada.masahiro@socionext.com>
@ 2019-08-14 16:06 ` Masahiro Yamada
  0 siblings, 0 replies; only message in thread
From: Masahiro Yamada @ 2019-08-14 16:06 UTC (permalink / raw)
  To: linux-kbuild
  Cc: Masahiro Yamada, Albert Ou, Benjamin Herrenschmidt,
	Catalin Marinas, Fenghua Yu, Geert Uytterhoeven, Helge Deller,
	James E.J. Bottomley, Jonathan Corbet, Michael Ellerman,
	Michal Marek, Palmer Dabbelt, Paul Mackerras, Paul Walmsley,
	Russell King, Tony Luck, Will Deacon, linux-arm-kernel,
	linux-doc, linux-ia64, linux-kernel, linux-m68k, linux-parisc,
	linux-riscv, linuxppc-dev

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>
---

 Documentation/kbuild/makefiles.rst | 5 +++++
 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 +++--
 10 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/Documentation/kbuild/makefiles.rst b/Documentation/kbuild/makefiles.rst
index d3448d2c8017..36ba92e199d2 100644
--- a/Documentation/kbuild/makefiles.rst
+++ b/Documentation/kbuild/makefiles.rst
@@ -999,6 +999,11 @@ When kbuild executes, the following steps are followed (roughly):
 
 	The linker script with full path. Assigned by the top-level Makefile.
 
+    KBUILD_LDS_MODULE
+
+	The module linker script with full path. Assigned by the top-level
+	Makefile and additionally by the arch Makefile.
+
     KBUILD_VMLINUX_OBJS
 
 	All object files for vmlinux. They are linked to vmlinux in the same
diff --git a/Makefile b/Makefile
index 164ca615e2f6..af808837a1f2 100644
--- a/Makefile
+++ b/Makefile
@@ -485,7 +485,8 @@ 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 :=
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index c3624ca6c0bc..fbe50eec8f34 100644
--- 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
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 61de992bbea3..d4ed1869e536 100644
--- 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
diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile
index 171290f9f1de..5c3bcaee5980 100644
--- a/arch/ia64/Makefile
+++ b/arch/ia64/Makefile
@@ -20,7 +20,7 @@ CHECKFLAGS	+= -D__ia64=1 -D__ia64__=1 -D_LP64 -D__LP64__
 
 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		:=
 
diff --git a/arch/m68k/Makefile b/arch/m68k/Makefile
index 482513b9af2c..5d9288384096 100644
--- 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
diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
index 3b77d729057f..36b834f1c933 100644
--- a/arch/parisc/Makefile
+++ b/arch/parisc/Makefile
@@ -60,7 +60,7 @@ KBUILD_CFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY=1 \
 		 -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
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index c345b79414a9..b2227855de20 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -67,7 +67,7 @@ UTS_MACHINE := $(subst $(space),,$(machine-y))
 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
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 7a117be8297c..426d989125a8 100644
--- 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)
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index bf15818f6947..905db30d6622 100644
--- 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)
-- 
2.17.1


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     [not found] <20190814160623.24802-1-yamada.masahiro@socionext.com>
2019-08-14 16:06 ` [PATCH 2/3] kbuild: rebuild modules when module linker scripts are updated Masahiro Yamada

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