kbuild: remove all dummy assignments to obj- Now kbuild core scripts create empty built-in.o where necessary. Remove "obj- := dummy.o" tricks. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

diff --git a/arch/arm/mach-uniphier/Makefile b/arch/arm/mach-uniphier/Makefile
index 6bea3d3..e69de29 100644
--- a/arch/arm/mach-uniphier/Makefile
+++ b/arch/arm/mach-uniphier/Makefile

@@ -1 +0,0 @@
-obj- += dummy.o

diff --git a/arch/mips/boot/dts/brcm/Makefile b/arch/mips/boot/dts/brcm/Makefile
index 09ba7e8..d8787c9 100644
--- a/arch/mips/boot/dts/brcm/Makefile
+++ b/arch/mips/boot/dts/brcm/Makefile

@@ -35,6 +35,3 @@
 	bcm97435svmb.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

diff --git a/arch/mips/boot/dts/cavium-octeon/Makefile b/arch/mips/boot/dts/cavium-octeon/Makefile
index f5d01b3..24a8efc 100644
--- a/arch/mips/boot/dts/cavium-octeon/Makefile
+++ b/arch/mips/boot/dts/cavium-octeon/Makefile

@@ -2,6 +2,3 @@
 dtb-$(CONFIG_CAVIUM_OCTEON_SOC)	+= octeon_3xxx.dtb octeon_68xx.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

diff --git a/arch/mips/boot/dts/img/Makefile b/arch/mips/boot/dts/img/Makefile
index 3eb2597..441a3c1 100644
--- a/arch/mips/boot/dts/img/Makefile
+++ b/arch/mips/boot/dts/img/Makefile

@@ -3,6 +3,3 @@
 
 dtb-$(CONFIG_MACH_PISTACHIO)	+= pistachio_marduk.dtb
 obj-$(CONFIG_MACH_PISTACHIO)	+= pistachio_marduk.dtb.o
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

diff --git a/arch/mips/boot/dts/ingenic/Makefile b/arch/mips/boot/dts/ingenic/Makefile
index 0357692..6a31759 100644
--- a/arch/mips/boot/dts/ingenic/Makefile
+++ b/arch/mips/boot/dts/ingenic/Makefile

@@ -3,6 +3,3 @@
 dtb-$(CONFIG_JZ4780_CI20)	+= ci20.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

diff --git a/arch/mips/boot/dts/lantiq/Makefile b/arch/mips/boot/dts/lantiq/Makefile
index 00e2e54..51ab9c1 100644
--- a/arch/mips/boot/dts/lantiq/Makefile
+++ b/arch/mips/boot/dts/lantiq/Makefile

@@ -2,6 +2,3 @@
 dtb-$(CONFIG_DT_EASY50712)	+= easy50712.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

diff --git a/arch/mips/boot/dts/mti/Makefile b/arch/mips/boot/dts/mti/Makefile
index 480af49..3508720 100644
--- a/arch/mips/boot/dts/mti/Makefile
+++ b/arch/mips/boot/dts/mti/Makefile

@@ -3,6 +3,3 @@
 dtb-$(CONFIG_LEGACY_BOARD_SEAD3)	+= sead3.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

diff --git a/arch/mips/boot/dts/netlogic/Makefile b/arch/mips/boot/dts/netlogic/Makefile
index 2b99450..d630b27 100644
--- a/arch/mips/boot/dts/netlogic/Makefile
+++ b/arch/mips/boot/dts/netlogic/Makefile

@@ -6,6 +6,3 @@
 dtb-$(CONFIG_DT_XLP_RVP)	+= xlp_rvp.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

diff --git a/arch/mips/boot/dts/ni/Makefile b/arch/mips/boot/dts/ni/Makefile
index 6cd9c60..9e2c9fa 100644
--- a/arch/mips/boot/dts/ni/Makefile
+++ b/arch/mips/boot/dts/ni/Makefile

@@ -1,4 +1 @@
 dtb-$(CONFIG_FIT_IMAGE_FDT_NI169445)	+= 169445.dtb
-
-# Force kbuild to make empty built-in.o if necessary
-obj-					+= dummy.o

diff --git a/arch/mips/boot/dts/pic32/Makefile b/arch/mips/boot/dts/pic32/Makefile
index a139a0f..ba9bcef 100644
--- a/arch/mips/boot/dts/pic32/Makefile
+++ b/arch/mips/boot/dts/pic32/Makefile

@@ -5,6 +5,3 @@
 					pic32mzda_sk.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

diff --git a/arch/mips/boot/dts/qca/Makefile b/arch/mips/boot/dts/qca/Makefile
index 639adea..4451cf4 100644
--- a/arch/mips/boot/dts/qca/Makefile
+++ b/arch/mips/boot/dts/qca/Makefile

@@ -5,6 +5,3 @@
 dtb-$(CONFIG_ATH79)			+= ar9331_dragino_ms14.dtb
 dtb-$(CONFIG_ATH79)			+= ar9331_omega.dtb
 dtb-$(CONFIG_ATH79)			+= ar9331_tl_mr3020.dtb
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

diff --git a/arch/mips/boot/dts/ralink/Makefile b/arch/mips/boot/dts/ralink/Makefile
index 323c8bc..94bee5b 100644
--- a/arch/mips/boot/dts/ralink/Makefile
+++ b/arch/mips/boot/dts/ralink/Makefile

@@ -7,6 +7,3 @@
 dtb-$(CONFIG_DTB_VOCORE2)	+= vocore2.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

diff --git a/arch/mips/boot/dts/xilfpga/Makefile b/arch/mips/boot/dts/xilfpga/Makefile
index 6163224..9987e0e3 100644
--- a/arch/mips/boot/dts/xilfpga/Makefile
+++ b/arch/mips/boot/dts/xilfpga/Makefile

@@ -2,6 +2,3 @@
 dtb-$(CONFIG_FIT_IMAGE_FDT_XILFPGA)	+= nexys4ddr.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))
-
-# Force kbuild to make empty built-in.o if necessary
-obj-				+= dummy.o

diff --git a/firmware/Makefile b/firmware/Makefile
index 168094a..2964138 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile

@@ -59,6 +59,3 @@
 
 targets := $(patsubst $(obj)/%,%, \
                                 $(shell find $(obj) -name \*.gen.S 2>/dev/null))
-# Without this, built-in.o won't be created when it's empty, and the
-# final vmlinux link will fail.
-obj- := dummy

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 3b4945c..adeaa13 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile

@@ -1,7 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-# kbuild trick to avoid linker error. Can be omitted if a module is built.
-obj- := dummy.o
-
 # List of programs to build
 hostprogs-y := test_lru_dist
 hostprogs-y += sock_example

diff --git a/samples/hidraw/Makefile b/samples/hidraw/Makefile
index f5c3012..dec1b22 100644
--- a/samples/hidraw/Makefile
+++ b/samples/hidraw/Makefile

@@ -1,7 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-# kbuild trick to avoid linker error. Can be omitted if a module is built.
-obj- := dummy.o
-
 # List of programs to build
 hostprogs-y := hid-example
 

diff --git a/samples/seccomp/Makefile b/samples/seccomp/Makefile
index 19a870e..0e349b8 100644
--- a/samples/seccomp/Makefile
+++ b/samples/seccomp/Makefile

@@ -1,7 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-# kbuild trick to avoid linker error. Can be omitted if a module is built.
-obj- := dummy.o
-
 hostprogs-$(CONFIG_SAMPLE_SECCOMP) := bpf-fancy dropper bpf-direct
 
 HOSTCFLAGS_bpf-fancy.o += -I$(objtree)/usr/include

diff --git a/samples/sockmap/Makefile b/samples/sockmap/Makefile
index 9291ab8..73f1da4 100644
--- a/samples/sockmap/Makefile
+++ b/samples/sockmap/Makefile

@@ -1,6 +1,3 @@
-# kbuild trick to avoid linker error. Can be omitted if a module is built.
-obj- := dummy.o
-
 # List of programs to build
 hostprogs-y := sockmap
 

diff --git a/samples/statx/Makefile b/samples/statx/Makefile
index 1f80a3d..59df7c2 100644
--- a/samples/statx/Makefile
+++ b/samples/statx/Makefile

@@ -1,6 +1,3 @@
-# kbuild trick to avoid linker error. Can be omitted if a module is built.
-obj- := dummy.o
-
 # List of programs to build
 hostprogs-$(CONFIG_SAMPLE_STATX) := test-statx
 

diff --git a/samples/uhid/Makefile b/samples/uhid/Makefile
index c95a696..8d7fd61 100644
--- a/samples/uhid/Makefile
+++ b/samples/uhid/Makefile

@@ -1,6 +1,3 @@
-# kbuild trick to avoid linker error. Can be omitted if a module is built.
-obj- := dummy.o
-
 # List of programs to build
 hostprogs-y := uhid-example