[PATCH v2 7/8] kbuild: use obj-y instead extra-y for objects placed at the head

Masahiro Yamada
2022-09-06T06:14:21Z

The objects placed at the head of vmlinux need special treatments:

- arch/$(SRCARCH)/Makefile adds them to head-y in order to place
them before other archives in the linker command line.

- arch/$(SRCARCH)/kernel/Makefile adds them to extra-y instead of
obj-y to avoid them going into built-in.a.

This commit gets rid of the latter.

Create vmlinux.a to collect all the objects that are unconditionally
linked to vmlinux. The objects listed in head-y are moved to the head
of vmlinux.a by using 'ar m'.

With this, arch/$(SRCARCH)/kernel/Makefile can consistently use obj-y
for builtin objects.

There is no *.o that is directly linked to vmlinux. Drop unneeded code
in scripts/clang-tools/gen_compile_commands.py.

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

(no changes since v1)

Documentation/kbuild/makefiles.rst | 18 +----------------
Makefile | 18 +++++++++++++----
arch/alpha/kernel/Makefile | 4 ++--
arch/arc/kernel/Makefile | 4 ++--
arch/arm/kernel/Makefile | 4 ++--
arch/arm64/kernel/Makefile | 4 ++--
arch/csky/kernel/Makefile | 4 ++--
arch/hexagon/kernel/Makefile | 3 ++-
arch/ia64/kernel/Makefile | 4 ++--
arch/loongarch/kernel/Makefile | 4 ++--
arch/m68k/68000/Makefile | 2 +-
arch/m68k/coldfire/Makefile | 2 +-
arch/m68k/kernel/Makefile | 21 ++++++++++----------
arch/microblaze/kernel/Makefile | 4 ++--
arch/mips/kernel/Makefile | 4 ++--
arch/nios2/kernel/Makefile | 2 +-
arch/openrisc/kernel/Makefile | 4 ++--
arch/parisc/kernel/Makefile | 4 ++--
arch/powerpc/kernel/Makefile | 22 ++++++++++-----------
arch/riscv/kernel/Makefile | 2 +-
arch/s390/kernel/Makefile | 4 ++--
arch/sh/kernel/Makefile | 4 ++--
arch/sparc/kernel/Makefile | 3 +--
arch/x86/kernel/Makefile | 10 +++++-----
arch/xtensa/kernel/Makefile | 4 ++--
scripts/Makefile.modpost | 5 ++---
scripts/Makefile.vmlinux_o | 6 +++---
scripts/clang-tools/gen_compile_commands.py | 19 +-----------------
scripts/link-vmlinux.sh | 10 ++++------
29 files changed, 87 insertions(+), 112 deletions(-)

diff --git a/Documentation/kbuild/makefiles.rst b/Documentation/kbuild/makefiles.rst
index 11a296e52d68..07c7e5a843c1 100644
--- a/Documentation/kbuild/makefiles.rst
+++ b/Documentation/kbuild/makefiles.rst
@@ -340,19 +340,7 @@ more details, with real examples.

Examples are:

- 1) head objects
-
- Some objects must be placed at the head of vmlinux. They are
- directly linked to vmlinux without going through built-in.a
- A typical use-case is an object that contains the entry point.
-
- arch/$(SRCARCH)/Makefile should specify such objects as head-y.
-
- Discussion:
- Given that we can control the section order in the linker script,
- why do we need head-y?
-
- 2) vmlinux linker script
+ 1) vmlinux linker script

The linker script for vmlinux is located at
arch/$(SRCARCH)/kernel/vmlinux.lds
@@ -360,10 +348,6 @@ more details, with real examples.
Example::

# arch/x86/kernel/Makefile
- extra-y := head_$(BITS).o
- extra-y += head$(BITS).o
- extra-y += ebda.o
- extra-y += platform-quirks.o
extra-y += vmlinux.lds

$(extra-y) should only contain targets needed for vmlinux.
diff --git a/Makefile b/Makefile
index f9ee16bd212d..f2d06aaaefd3 100644
--- a/Makefile
+++ b/Makefile
@@ -1113,7 +1113,7 @@ clean-dirs := $(vmlinux-alldirs)
export ARCH_CORE := $(core-y)
export ARCH_DRIVERS := $(drivers-y)
# Externally visible symbols (used by link-vmlinux.sh)
-KBUILD_VMLINUX_OBJS := $(head-y) ./built-in.a
+KBUILD_VMLINUX_OBJS := ./built-in.a
KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
ifdef CONFIG_MODULES
KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
@@ -1122,7 +1122,7 @@ else
KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
endif

-export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
+export KBUILD_VMLINUX_LIBS
export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
# used by scripts/Makefile.package
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
@@ -1151,8 +1151,18 @@ quiet_cmd_autoksyms_h = GEN $@
$(autoksyms_h):
$(call cmd,autoksyms_h)

+quiet_cmd_ar_vmlinux.a = AR $@
+ cmd_ar_vmlinux.a = \
+ rm -f $@; \
+ $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
+ $(AR) mPi $$($(AR) t $@ | head -n1) $@ $(head-y)
+
+targets += vmlinux.a
+vmlinux.a: $(KBUILD_VMLINUX_OBJS) FORCE
+ $(call if_changed,ar_vmlinux.a)
+
targets += vmlinux.o
-vmlinux.o: autoksyms_recursive $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE
+vmlinux.o: autoksyms_recursive vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o

ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
@@ -1909,7 +1919,7 @@ quiet_cmd_gen_compile_commands = GEN $@
cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))

$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
- $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
+ $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
$(if $(CONFIG_MODULES), $(MODORDER)) FORCE
$(call if_changed,gen_compile_commands)

diff --git a/arch/alpha/kernel/Makefile b/arch/alpha/kernel/Makefile
index 5a74581bf0ee..5a5b0a8b7c6a 100644
--- a/arch/alpha/kernel/Makefile
+++ b/arch/alpha/kernel/Makefile
@@ -3,11 +3,11 @@
# Makefile for the linux kernel.
#

-extra-y := head.o vmlinux.lds
+extra-y := vmlinux.lds
asflags-y := $(KBUILD_CFLAGS)
ccflags-y := -Wno-sign-compare

-obj-y := entry.o traps.o process.o osf_sys.o irq.o \
+obj-y := head.o entry.o traps.o process.o osf_sys.o irq.o \
irq_alpha.o signal.o setup.o ptrace.o time.o \
systbls.o err_common.o io.o bugs.o

diff --git a/arch/arc/kernel/Makefile b/arch/arc/kernel/Makefile
index 8c4fc4b54c14..0723d888ac44 100644
--- a/arch/arc/kernel/Makefile
+++ b/arch/arc/kernel/Makefile
@@ -3,7 +3,7 @@
# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
#

-obj-y := arcksyms.o setup.o irq.o reset.o ptrace.o process.o devtree.o
+obj-y := head.o arcksyms.o setup.o irq.o reset.o ptrace.o process.o devtree.o
obj-y += signal.o traps.o sys.o troubleshoot.o stacktrace.o disasm.o
obj-$(CONFIG_ISA_ARCOMPACT) += entry-compact.o intc-compact.o
obj-$(CONFIG_ISA_ARCV2) += entry-arcv2.o intc-arcv2.o
@@ -31,4 +31,4 @@ else
obj-y += ctx_sw_asm.o
endif

-extra-y := vmlinux.lds head.o
+extra-y := vmlinux.lds
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 553866751e1a..8feaa3217ec5 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -89,7 +89,7 @@ obj-$(CONFIG_VDSO) += vdso.o
obj-$(CONFIG_EFI) += efi.o
obj-$(CONFIG_PARAVIRT) += paravirt.o

-head-y := head$(MMUEXT).o
+obj-y += head$(MMUEXT).o
obj-$(CONFIG_DEBUG_LL) += debug.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_ARM_PATCH_PHYS_VIRT) += phys2virt.o
@@ -109,4 +109,4 @@ obj-$(CONFIG_HAVE_ARM_SMCCC) += smccc-call.o

obj-$(CONFIG_GENERIC_CPU_VULNERABILITIES) += spectre.o

-extra-y := $(head-y) vmlinux.lds
+extra-y := vmlinux.lds
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 1add7b01efa7..b619ff207a57 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -85,8 +85,8 @@ $(obj)/vdso-wrap.o: $(obj)/vdso/vdso.so
$(obj)/vdso32-wrap.o: $(obj)/vdso32/vdso.so

obj-y += probes/
-head-y := head.o
-extra-y += $(head-y) vmlinux.lds
+obj-y += head.o
+extra-y += vmlinux.lds

ifeq ($(CONFIG_DEBUG_EFI),y)
AFLAGS_head.o += -DVMLINUX_PATH="\"$(realpath $(objtree)/vmlinux)\""
diff --git a/arch/csky/kernel/Makefile b/arch/csky/kernel/Makefile
index 6f14c924b20d..8a868316b912 100644
--- a/arch/csky/kernel/Makefile
+++ b/arch/csky/kernel/Makefile
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
-extra-y := head.o vmlinux.lds
+extra-y := vmlinux.lds

-obj-y += entry.o atomic.o signal.o traps.o irq.o time.o vdso.o vdso/
+obj-y += head.o entry.o atomic.o signal.o traps.o irq.o time.o vdso.o vdso/
obj-y += power.o syscall.o syscall_table.o setup.o io.o
obj-y += process.o cpu-probe.o ptrace.o stacktrace.o
obj-y += probes/
diff --git a/arch/hexagon/kernel/Makefile b/arch/hexagon/kernel/Makefile
index fae3dce32fde..e73cb321630e 100644
--- a/arch/hexagon/kernel/Makefile
+++ b/arch/hexagon/kernel/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
-extra-y := head.o vmlinux.lds
+extra-y := vmlinux.lds

+obj-y += head.o
obj-$(CONFIG_SMP) += smp.o

obj-y += setup.o irq_cpu.o traps.o syscalltab.o signal.o time.o
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index 08d4a2ba0652..4a1fcb121dda 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -7,9 +7,9 @@ ifdef CONFIG_DYNAMIC_FTRACE
CFLAGS_REMOVE_ftrace.o = -pg
endif

-extra-y := head.o vmlinux.lds
+extra-y := vmlinux.lds

-obj-y := entry.o efi.o efi_stub.o gate-data.o fsys.o irq.o irq_ia64.o \
+obj-y := head.o entry.o efi.o efi_stub.o gate-data.o fsys.o irq.o irq_ia64.o \
irq_lsapic.o ivt.o pal.o patch.o process.o ptrace.o sal.o \
salinfo.o setup.o signal.o sys_ia64.o time.o traps.o unaligned.o \
unwind.o mca.o mca_asm.o topology.o dma-mapping.o iosapic.o acpi.o \
diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile
index e5be17009fe8..6c33b5c45573 100644
--- a/arch/loongarch/kernel/Makefile
+++ b/arch/loongarch/kernel/Makefile
@@ -3,9 +3,9 @@
# Makefile for the Linux/LoongArch kernel.
#

-extra-y := head.o vmlinux.lds
+extra-y := vmlinux.lds

-obj-y += cpu-probe.o cacheinfo.o env.o setup.o entry.o genex.o \
+obj-y += head.o cpu-probe.o cacheinfo.o env.o setup.o entry.o genex.o \
traps.o irq.o idle.o process.o dma.o mem.o io.o reset.o switch.o \
elf.o syscall.o signal.o time.o topology.o inst.o ptrace.o vdso.o

diff --git a/arch/m68k/68000/Makefile b/arch/m68k/68000/Makefile
index 674541fdf5b8..279560add577 100644
--- a/arch/m68k/68000/Makefile
+++ b/arch/m68k/68000/Makefile
@@ -17,4 +17,4 @@ obj-$(CONFIG_DRAGEN2) += dragen2.o
obj-$(CONFIG_UCSIMM) += ucsimm.o
obj-$(CONFIG_UCDIMM) += ucsimm.o

-extra-y := head.o
+obj-y += head.o
diff --git a/arch/m68k/coldfire/Makefile b/arch/m68k/coldfire/Makefile
index 9419a6c1f036..c56bc0dc7f2e 100644
--- a/arch/m68k/coldfire/Makefile
+++ b/arch/m68k/coldfire/Makefile
@@ -45,4 +45,4 @@ obj-$(CONFIG_STMARK2) += stmark2.o
obj-$(CONFIG_PCI) += pci.o

obj-y += gpio.o
-extra-y := head.o
+obj-y += head.o
diff --git a/arch/m68k/kernel/Makefile b/arch/m68k/kernel/Makefile
index c0833da6a2ca..1755e6cd309f 100644
--- a/arch/m68k/kernel/Makefile
+++ b/arch/m68k/kernel/Makefile
@@ -3,18 +3,19 @@
# Makefile for the linux kernel.
#

-extra-$(CONFIG_AMIGA) := head.o
-extra-$(CONFIG_ATARI) := head.o
-extra-$(CONFIG_MAC) := head.o
-extra-$(CONFIG_APOLLO) := head.o
-extra-$(CONFIG_VME) := head.o
-extra-$(CONFIG_HP300) := head.o
-extra-$(CONFIG_Q40) := head.o
-extra-$(CONFIG_SUN3X) := head.o
-extra-$(CONFIG_VIRT) := head.o
-extra-$(CONFIG_SUN3) := sun3-head.o
extra-y += vmlinux.lds

+obj-$(CONFIG_AMIGA) := head.o
+obj-$(CONFIG_ATARI) := head.o
+obj-$(CONFIG_MAC) := head.o
+obj-$(CONFIG_APOLLO) := head.o
+obj-$(CONFIG_VME) := head.o
+obj-$(CONFIG_HP300) := head.o
+obj-$(CONFIG_Q40) := head.o
+obj-$(CONFIG_SUN3X) := head.o
+obj-$(CONFIG_VIRT) := head.o
+obj-$(CONFIG_SUN3) := sun3-head.o
+
obj-y := entry.o irq.o module.o process.o ptrace.o
obj-y += setup.o signal.o sys_m68k.o syscalltable.o time.o traps.o

diff --git a/arch/microblaze/kernel/Makefile b/arch/microblaze/kernel/Makefile
index 15a20eb814ce..4393bee64eaf 100644
--- a/arch/microblaze/kernel/Makefile
+++ b/arch/microblaze/kernel/Makefile
@@ -12,9 +12,9 @@ CFLAGS_REMOVE_ftrace.o = -pg
CFLAGS_REMOVE_process.o = -pg
endif

-extra-y := head.o vmlinux.lds
+extra-y := vmlinux.lds

-obj-y += dma.o exceptions.o \
+obj-y += head.o dma.o exceptions.o \
hw_exception_handler.o irq.o \
process.o prom.o ptrace.o \
reset.o setup.o signal.o sys_microblaze.o timer.o traps.o unwind.o
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index 7c96282bff2e..5d1addac5e28 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -3,9 +3,9 @@
# Makefile for the Linux/MIPS kernel.
#

-extra-y := head.o vmlinux.lds
+extra-y := vmlinux.lds

-obj-y += branch.o cmpxchg.o elf.o entry.o genex.o idle.o irq.o \
+obj-y += head.o branch.o cmpxchg.o elf.o entry.o genex.o idle.o irq.o \
process.o prom.o ptrace.o reset.o setup.o signal.o \
syscall.o time.o topology.o traps.o unaligned.o watch.o \
vdso.o cacheinfo.o
diff --git a/arch/nios2/kernel/Makefile b/arch/nios2/kernel/Makefile
index 0b645e1e3158..78a913181fa1 100644
--- a/arch/nios2/kernel/Makefile
+++ b/arch/nios2/kernel/Makefile
@@ -3,9 +3,9 @@
# Makefile for the nios2 linux kernel.
#

-extra-y += head.o
extra-y += vmlinux.lds

+obj-y += head.o
obj-y += cpuinfo.o
obj-y += entry.o
obj-y += insnemu.o
diff --git a/arch/openrisc/kernel/Makefile b/arch/openrisc/kernel/Makefile
index 2d172e79f58d..79129161f3e0 100644
--- a/arch/openrisc/kernel/Makefile
+++ b/arch/openrisc/kernel/Makefile
@@ -3,9 +3,9 @@
# Makefile for the linux kernel.
#

-extra-y := head.o vmlinux.lds
+extra-y := vmlinux.lds

-obj-y := setup.o or32_ksyms.o process.o dma.o \
+obj-y := head.o setup.o or32_ksyms.o process.o dma.o \
traps.o time.o irq.o entry.o ptrace.o signal.o \
sys_call_table.o unwinder.o

diff --git a/arch/parisc/kernel/Makefile b/arch/parisc/kernel/Makefile
index d0bfac89a842..3d138c9cf9ce 100644
--- a/arch/parisc/kernel/Makefile
+++ b/arch/parisc/kernel/Makefile
@@ -3,9 +3,9 @@
# Makefile for arch/parisc/kernel
#

-extra-y := head.o vmlinux.lds
+extra-y := vmlinux.lds

-obj-y := cache.o pacache.o setup.o pdt.o traps.o time.o irq.o \
+obj-y := head.o cache.o pacache.o setup.o pdt.o traps.o time.o irq.o \
pa7300lc.o syscall.o entry.o sys_parisc.o firmware.o \
ptrace.o hardware.o inventory.o drivers.o alternative.o \
signal.o hpmc.o real2.o parisc_ksyms.o unaligned.o \
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 06d2d1f78f71..f264d9b2cb63 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -118,12 +118,12 @@ obj-$(CONFIG_PPC_FSL_BOOK3E) += cpu_setup_fsl_booke.o
obj-$(CONFIG_PPC_DOORBELL) += dbell.o
obj-$(CONFIG_JUMP_LABEL) += jump_label.o

-extra-$(CONFIG_PPC64) := head_64.o
-extra-$(CONFIG_PPC_BOOK3S_32) := head_book3s_32.o
-extra-$(CONFIG_40x) := head_40x.o
-extra-$(CONFIG_44x) := head_44x.o
-extra-$(CONFIG_FSL_BOOKE) := head_fsl_booke.o
-extra-$(CONFIG_PPC_8xx) := head_8xx.o
+obj-$(CONFIG_PPC64) += head_64.o
+obj-$(CONFIG_PPC_BOOK3S_32) += head_book3s_32.o
+obj-$(CONFIG_40x) += head_40x.o
+obj-$(CONFIG_44x) += head_44x.o
+obj-$(CONFIG_FSL_BOOKE) += head_fsl_booke.o
+obj-$(CONFIG_PPC_8xx) += head_8xx.o
extra-y += vmlinux.lds

obj-$(CONFIG_RELOCATABLE) += reloc_$(BITS).o
@@ -198,12 +198,12 @@ KCOV_INSTRUMENT_paca.o := n
CFLAGS_setup_64.o += -fno-stack-protector
CFLAGS_paca.o += -fno-stack-protector

-extra-$(CONFIG_PPC_FPU) += fpu.o
-extra-$(CONFIG_ALTIVEC) += vector.o
-extra-$(CONFIG_PPC64) += entry_64.o
-extra-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += prom_init.o
+obj-$(CONFIG_PPC_FPU) += fpu.o
+obj-$(CONFIG_ALTIVEC) += vector.o
+obj-$(CONFIG_PPC64) += entry_64.o
+obj-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += prom_init.o

-extra-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += prom_init_check
+obj-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += prom_init_check

quiet_cmd_prom_init_check = PROMCHK $@
cmd_prom_init_check = $(CONFIG_SHELL) $< "$(NM)" $(obj)/prom_init.o; touch $@
diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
index 33bb60a354cd..db6e4b1294ba 100644
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
@@ -28,9 +28,9 @@ KASAN_SANITIZE_cpufeature.o := n
endif
endif

-extra-y += head.o
extra-y += vmlinux.lds

+obj-y += head.o
obj-y += soc.o
obj-$(CONFIG_RISCV_ALTERNATIVE) += alternative.o
obj-y += cpu.o
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 3cbfa9fddd9a..7ce00816b8df 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -33,7 +33,7 @@ CFLAGS_stacktrace.o += -fno-optimize-sibling-calls
CFLAGS_dumpstack.o += -fno-optimize-sibling-calls
CFLAGS_unwind_bc.o += -fno-optimize-sibling-calls

-obj-y := traps.o time.o process.o earlypgm.o early.o setup.o idle.o vtime.o
+obj-y := head64.o traps.o time.o process.o earlypgm.o early.o setup.o idle.o vtime.o
obj-y += processor.o syscall.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
obj-y += debug.o irq.o ipl.o dis.o diag.o vdso.o cpufeature.o
obj-y += sysinfo.o lgr.o os_info.o machine_kexec.o
@@ -42,7 +42,7 @@ obj-y += entry.o reipl.o relocate_kernel.o kdebugfs.o alternative.o
obj-y += nospec-branch.o ipl_vmparm.o machine_kexec_reloc.o unwind_bc.o
obj-y += smp.o text_amode31.o stacktrace.o

-extra-y += head64.o vmlinux.lds
+extra-y += vmlinux.lds

obj-$(CONFIG_SYSFS) += nospec-sysfs.o
CFLAGS_REMOVE_nospec-branch.o += $(CC_FLAGS_EXPOLINE)
diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile
index aa0fbc9202b1..69cd9ac4b2ab 100644
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@ -3,7 +3,7 @@
# Makefile for the Linux/SuperH kernel.
#

-extra-y := head_32.o vmlinux.lds
+extra-y := vmlinux.lds

ifdef CONFIG_FUNCTION_TRACER
# Do not profile debug and lowlevel utilities
@@ -12,7 +12,7 @@ endif

CFLAGS_REMOVE_return_address.o = -pg

-obj-y := debugtraps.o dumpstack.o \
+obj-y := head_32.o debugtraps.o dumpstack.o \
idle.o io.o irq.o irq_32.o kdebugfs.o \
machvec.o nmi_debug.o process.o \
process_32.o ptrace.o ptrace_32.o \
diff --git a/arch/sparc/kernel/Makefile b/arch/sparc/kernel/Makefile
index d3a0e072ebe8..b328e4a0bd57 100644
--- a/arch/sparc/kernel/Makefile
+++ b/arch/sparc/kernel/Makefile
@@ -7,8 +7,6 @@
asflags-y := -ansi
ccflags-y := -Werror

-extra-y := head_$(BITS).o
-
# Undefine sparc when processing vmlinux.lds - it is used
# And teach CPP we are doing $(BITS) builds (for this case)
CPPFLAGS_vmlinux.lds := -Usparc -m$(BITS)
@@ -22,6 +20,7 @@ CFLAGS_REMOVE_perf_event.o := -pg
CFLAGS_REMOVE_pcr.o := -pg
endif

+obj-y := head_$(BITS).o
obj-$(CONFIG_SPARC64) += urtt_fill.o
obj-$(CONFIG_SPARC32) += entry.o wof.o wuf.o
obj-$(CONFIG_SPARC32) += etrap_32.o
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index a20a5ebfacd7..956e50ca06e0 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -3,10 +3,6 @@
# Makefile for the linux kernel.
#

-extra-y := head_$(BITS).o
-extra-y += head$(BITS).o
-extra-y += ebda.o
-extra-y += platform-quirks.o
extra-y += vmlinux.lds

CPPFLAGS_vmlinux.lds += -U$(UTS_MACHINE)
@@ -42,7 +38,11 @@ KCOV_INSTRUMENT := n

CFLAGS_irq.o := -I $(srctree)/$(src)/../include/asm/trace

-obj-y := process_$(BITS).o signal.o
+obj-y += head_$(BITS).o
+obj-y += head$(BITS).o
+obj-y += ebda.o
+obj-y += platform-quirks.o
+obj-y += process_$(BITS).o signal.o
obj-$(CONFIG_COMPAT) += signal_compat.o
obj-y += traps.o idt.o irq.o irq_$(BITS).o dumpstack_$(BITS).o
obj-y += time.o ioport.o dumpstack.o nmi.o
diff --git a/arch/xtensa/kernel/Makefile b/arch/xtensa/kernel/Makefile
index 897c1c741058..f28b8e3d717e 100644
--- a/arch/xtensa/kernel/Makefile
+++ b/arch/xtensa/kernel/Makefile
@@ -3,9 +3,9 @@
# Makefile for the Linux/Xtensa kernel.
#

-extra-y := head.o vmlinux.lds
+extra-y := vmlinux.lds

-obj-y := align.o coprocessor.o entry.o irq.o platform.o process.o \
+obj-y := head.o align.o coprocessor.o entry.o irq.o platform.o process.o \
ptrace.o setup.o signal.o stacktrace.o syscall.o time.o traps.o \
vectors.o

diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index d7d3138c5ecc..4f74370ad1ee 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -70,13 +70,12 @@ quiet_cmd_vmlinux_objs = GEN $@
for f in $(real-prereqs); do \
case $${f} in \
*libgcc.a) ;; \
- *.a) $(AR) t $${f} ;; \
- *) echo $${f} ;; \
+ *) $(AR) t $${f} ;; \
esac \
done > $@

targets += .vmlinux.objs
-.vmlinux.objs: $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE
+.vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
$(call if_changed,vmlinux_objs)

vmlinux.o-if-present := $(wildcard vmlinux.o)
diff --git a/scripts/Makefile.vmlinux_o b/scripts/Makefile.vmlinux_o
index 84019814f33f..81a4e0484457 100644
--- a/scripts/Makefile.vmlinux_o
+++ b/scripts/Makefile.vmlinux_o
@@ -18,7 +18,7 @@ quiet_cmd_gen_initcalls_lds = GEN $@
$(PERL) $(real-prereqs) > $@

.tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \
- $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE
+ vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
$(call if_changed,gen_initcalls_lds)

targets := .tmp_initcalls.lds
@@ -55,7 +55,7 @@ quiet_cmd_ld_vmlinux.o = LD $@
cmd_ld_vmlinux.o = \
$(LD) ${KBUILD_LDFLAGS} -r -o $@ \
$(addprefix -T , $(initcalls-lds)) \
- --whole-archive $(KBUILD_VMLINUX_OBJS) --no-whole-archive \
+ --whole-archive vmlinux.a --no-whole-archive \
--start-group $(KBUILD_VMLINUX_LIBS) --end-group \
$(cmd_objtool)

@@ -64,7 +64,7 @@ define rule_ld_vmlinux.o
$(call cmd,gen_objtooldep)
endef

-vmlinux.o: $(initcalls-lds) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE
+vmlinux.o: $(initcalls-lds) vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
$(call if_changed_rule,ld_vmlinux.o)

targets += vmlinux.o
diff --git a/scripts/clang-tools/gen_compile_commands.py b/scripts/clang-tools/gen_compile_commands.py
index 47da25b3ba7d..d800b2c0af97 100755
--- a/scripts/clang-tools/gen_compile_commands.py
+++ b/scripts/clang-tools/gen_compile_commands.py
@@ -109,20 +109,6 @@ def to_cmdfile(path):
return os.path.join(dir, '.' + base + '.cmd')

-def cmdfiles_for_o(obj):
- """Generate the iterator of .cmd files associated with the object
-
- Yield the .cmd file used to build the given object
-
- Args:
- obj: The object path
-
- Yields:
- The path to .cmd file
- """
- yield to_cmdfile(obj)
-
-
def cmdfiles_for_a(archive, ar):
"""Generate the iterator of .cmd files associated with the archive.

@@ -211,13 +197,10 @@ def main():
for path in paths:
# If 'path' is a directory, handle all .cmd files under it.
# Otherwise, handle .cmd files associated with the file.
- # Most of built-in objects are linked via archives (built-in.a or lib.a)
- # but some objects are linked to vmlinux directly.
+ # built-in objects are linked via vmlinux.a
# Modules are listed in modules.order.
if os.path.isdir(path):
cmdfiles = cmdfiles_in_dir(path)
- elif path.endswith('.o'):
- cmdfiles = cmdfiles_for_o(path)
elif path.endswith('.a'):
cmdfiles = cmdfiles_for_a(path, ar)
elif path.endswith('modules.order'):
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 6a197d8a88ac..23ac13fd9d89 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -3,17 +3,15 @@
#
# link vmlinux
#
-# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_OBJS) and
-# $(KBUILD_VMLINUX_LIBS). Most are built-in.a files from top-level directories
-# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
+# vmlinux is linked from the objects in vmlinux.a and $(KBUILD_VMLINUX_LIBS).
+# vmlinux.a contains objects that are linked unconditionally.
# $(KBUILD_VMLINUX_LIBS) are archives which are linked conditionally
# (not within --whole-archive), and do not require symbol indexes added.
#
# vmlinux
# ^
# |
-# +--< $(KBUILD_VMLINUX_OBJS)
-# | +--< init/built-in.a drivers/built-in.a mm/built-in.a + more
+# +--< vmlinux.a
# |
# +--< $(KBUILD_VMLINUX_LIBS)
# | +--< lib/lib.a + more
@@ -67,7 +65,7 @@ vmlinux_link()
objs=vmlinux.o
libs=
else
- objs="${KBUILD_VMLINUX_OBJS}"
+ objs=vmlinux.a
libs="${KBUILD_VMLINUX_LIBS}"
fi

--
2.34.1