kbuild: Move generation of vmlinux.lds.s into arch/.../kernel

Currently, vmlinux.lds.s is generated by the top-level Makefile.
Unfortunately, this causes the automatic CONFIG dependencies to
not work correctly, the reason being that make caches the timestamps
of include/config/* so even after split-include updated the
timestamps, make still uses the cached stamps to decide whether to
rebuild vmlinux.lds.s.

The simple fix is to move generation of vmlinux.lds.s into the
arch/$(ARCH)/kernel subdirectories, where we build other files
for the final link (like head.o) anyway. This also means some
special code in the top-level Makefile for preprocessing can go
away, since we now just use the standard rules during the recursive
phase.

This patches fixes up all archs for this change (untested).

Makefile

@@ -388,7 +388,7 @@ define rule_vmlinux
 	$(NM) $@ | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > System.map
 endef
 
-LDFLAGS_vmlinux += -T arch/$(ARCH)/vmlinux.lds.s
+LDFLAGS_vmlinux += -T arch/$(ARCH)/kernel/vmlinux.lds.s
 
 #	Generate section listing all symbols and add it into vmlinux
 #	It's a three stage process:
@@ -414,23 +414,23 @@ cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) > $@
 .tmp_kallsyms%.S: .tmp_vmlinux%
 	$(call cmd,kallsyms)
 
-.tmp_vmlinux1: $(vmlinux-objs) arch/$(ARCH)/vmlinux.lds.s FORCE
+.tmp_vmlinux1: $(vmlinux-objs) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 	+$(call if_changed_rule,vmlinux__)
 
-.tmp_vmlinux2: $(vmlinux-objs) .tmp_kallsyms1.o arch/$(ARCH)/vmlinux.lds.s FORCE
+.tmp_vmlinux2: $(vmlinux-objs) .tmp_kallsyms1.o arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 	$(call if_changed_rule,vmlinux__)
 
 endif
 
 #	Finally the vmlinux rule
 
-vmlinux: $(vmlinux-objs) $(kallsyms.o) arch/$(ARCH)/vmlinux.lds.s FORCE
+vmlinux: $(vmlinux-objs) $(kallsyms.o) arch/$(ARCH)/kernel/vmlinux.lds.s FORCE
 	$(call if_changed_rule,vmlinux)
 
 #	The actual objects are generated when descending, 
 #	make sure no implicit rule kicks in
 
-$(sort $(vmlinux-objs)): $(SUBDIRS) ;
+$(sort $(vmlinux-objs)) arch/$(ARCH)/kernel/vmlinux.lds.s: $(SUBDIRS) ;
 
 # 	Handle descending into subdirectories listed in $(SUBDIRS)
 
@@ -453,15 +453,10 @@ endif
 endif
 	$(if $(CONFIG_MODULES),$(Q)mkdir -p $(MODVERDIR))
 
-#	This can be used by arch/$ARCH/Makefile to preprocess
-#	their vmlinux.lds.S file
+#	Leave this as default for preprocessing vmlinux.lds.S, which is now
+#	done in arch/$(ARCH)/kernel/Makefile
 
-AFLAGS_vmlinux.lds.o += -P -C -U$(ARCH)
-
-arch/$(ARCH)/vmlinux.lds.s: %.s: %.S scripts FORCE
-	$(call if_changed_dep,as_s_S)
-
-targets += arch/$(ARCH)/vmlinux.lds.s
+export AFLAGS_vmlinux.lds.o += -P -C -U$(ARCH)
 
 # Single targets
 # ---------------------------------------------------------------------------
@@ -882,9 +877,6 @@ endif # ifdef include_config
 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) $(NOSTDINC_FLAGS) \
 	  $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
 
-quiet_cmd_as_s_S = CPP     $@
-cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $< 
-
 quiet_cmd_as_o_S = AS      $@
 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
 

arch/alpha/kernel/Makefile

@@ -2,7 +2,7 @@
 # Makefile for the linux kernel.
 #
 
-extra-y		:= head.o
+extra-y		:= head.o vmlinux.lds.s
 EXTRA_AFLAGS	:= $(CFLAGS)
 EXTRA_CFLAGS	:= -Werror -Wno-sign-compare
 

arch/arm/kernel/Makefile

@@ -30,7 +30,7 @@ endif
 head-y			:= head.o
 obj-$(CONFIG_DEBUG_LL)	+= debug.o
 
-extra-y := $(head-y) init_task.o
+extra-y := $(head-y) init_task.o vmlinux.lds.s
 
 # Spell out some dependencies that `make dep' doesn't spot
 $(obj)/entry-armv.o: 	$(obj)/entry-header.S include/asm-arm/constants.h

arch/arm26/kernel/Makefile

@@ -14,5 +14,5 @@ obj-y		:= compat.o dma.o entry.o irq.o   \
 obj-$(CONFIG_FIQ)		+= fiq.o
 obj-$(CONFIG_MODULES)		+= armksyms.o
 
-extra-y := init_task.o
+extra-y := init_task.o vmlinux.lds.s
 

arch/cris/Makefile

@@ -93,7 +93,7 @@ arch/$(ARCH)/.links:
 	@ln -sfn $(SARCH)/drivers arch/$(ARCH)/drivers
 	@ln -sfn $(SARCH)/boot arch/$(ARCH)/boot
 	@ln -sfn $(SARCH)/lib arch/$(ARCH)/lib
-	@ln -sfn $(SARCH)/vmlinux.lds.S arch/$(ARCH)/vmlinux.lds.S
+	@ln -sfn $(SARCH)/vmlinux.lds.S arch/$(ARCH)/kernel/vmlinux.lds.S
 	@touch $@
 
 # Create link to sub arch includes

arch/cris/kernel/Makefile

@@ -3,6 +3,8 @@
 # Makefile for the linux kernel.
 #
 
+extra-y := vmlinux.lds.s
+
 obj-y   := process.o traps.o irq.o ptrace.o setup.o \
 	   time.o sys_cris.o semaphore.o
 

arch/h8300/kernel/Makefile

 #
 # Makefile for the linux kernel.
 #
-# Note! Dependencies are done automagically by 'make dep', which also
-# removes any old dependencies. DON'T put your own dependencies here
-# unless it's something special (ie not a .c file).
-#
-# Note 2! The CFLAGS definitions are now in the main makefile...
+
+extra-y := vmlinux.lds.s
 
 obj-y := process.o traps.o ptrace.o \
 	 sys_h8300.o time.o semaphore.o signal.o \

arch/i386/kernel/Makefile

@@ -2,7 +2,7 @@
 # Makefile for the linux kernel.
 #
 
-extra-y := head.o init_task.o
+extra-y := head.o init_task.o vmlinux.lds.s
 
 obj-y	:= process.o semaphore.o signal.o entry.o traps.o irq.o vm86.o \
 		ptrace.o i8259.o ioport.o ldt.o setup.o time.o sys_i386.o \

arch/ia64/kernel/Makefile

@@ -2,7 +2,7 @@
 # Makefile for the linux kernel.
 #
 
-extra-y	:= head.o init_task.o
+extra-y	:= head.o init_task.o vmlinux.lds.s
 
 obj-y := acpi.o entry.o efi.o efi_stub.o gate-data.o fsys.o ia64_ksyms.o irq.o irq_ia64.o	\
 	 irq_lsapic.o ivt.o machvec.o pal.o patch.o process.o perfmon.o ptrace.o sal.o		\

arch/m68k/kernel/Makefile

@@ -6,7 +6,8 @@ ifndef CONFIG_SUN3
   extra-y := head.o
 else
   extra-y := sun3-head.o
-endif 
+endif
+extra-y	+= vmlinux.lds.s
 
 obj-y		:= entry.o process.o traps.o ints.o signal.o ptrace.o \
 			sys_m68k.o time.o semaphore.o setup.o m68k_ksyms.o

arch/m68knommu/kernel/Makefile

@@ -2,6 +2,8 @@
 # Makefile for arch/m68knommu/kernel.
 #
 
+extra-y := vmlinux.lds.s
+
 obj-y += entry.o init_task.o m68k_ksyms.o process.o ptrace.o \
 	 semaphore.o setup.o signal.o syscalltable.o sys_m68k.o time.o \
 	 traps.o

arch/mips/kernel/Makefile

@@ -2,7 +2,7 @@
 # Makefile for the Linux/MIPS kernel.
 #
 
-extra-y		:= head.o init_task.o
+extra-y		:= head.o init_task.o vmlinux.lds.s
 
 obj-y		+= cpu-probe.o branch.o entry.o genex.o irq.o process.o \
 		   ptrace.o reset.o semaphore.o setup.o signal.o syscall.o \

arch/parisc/kernel/Makefile

@@ -4,7 +4,7 @@
 
 head-y			:= head.o
 head-$(CONFIG_PARISC64)	:= head64.o
-extra-y			:= init_task.o $(head-y)
+extra-y			:= init_task.o $(head-y) vmlinux.lds.s
 
 AFLAGS_entry.o	:= -traditional
 AFLAGS_pacache.o := -traditional

arch/ppc/kernel/Makefile

@@ -14,6 +14,7 @@ extra-y				:= head.o
 extra-$(CONFIG_40x)		:= head_4xx.o
 extra-$(CONFIG_8xx)		:= head_8xx.o
 extra-$(CONFIG_6xx)		+= idle_6xx.o
+extra-y				+= vmlinux.lds.s
 
 obj-y				:= entry.o traps.o irq.o idle.o time.o misc.o \
 					process.o signal.o ptrace.o align.o \

arch/ppc64/kernel/Makefile

@@ -3,7 +3,8 @@
 #
 
 EXTRA_CFLAGS	+= -mno-minimal-toc
-extra-y		:= head.o
+extra-y		:= head.o vmlinux.lds.s
+
 obj-y               :=	setup.o entry.o traps.o irq.o idle.o \
 			time.o process.o signal.o syscalls.o misc.o ptrace.o \
 			align.o semaphore.o bitops.o stab.o htab.o pacaData.o \

arch/s390/kernel/Makefile

@@ -10,7 +10,7 @@ obj-y	:=  bitmap.o traps.o time.o process.o \
 
 extra-$(CONFIG_ARCH_S390_31)	+= head.o 
 extra-$(CONFIG_ARCH_S390X)	+= head64.o 
-extra-y				+= init_task.o
+extra-y				+= init_task.o vmlinux.lds.s
 
 obj-$(CONFIG_MODULES)		+= s390_ksyms.o module.o
 obj-$(CONFIG_SMP)		+= smp.o

arch/sh/kernel/Makefile

@@ -2,7 +2,7 @@
 # Makefile for the Linux/SuperH kernel.
 #
 
-extra-y	:= head.o init_task.o
+extra-y	:= head.o init_task.o vmlinux.lds.s
 
 obj-y	:= process.o signal.o entry.o traps.o irq.o \
 	ptrace.o setup.o time.o sys_sh.o semaphore.o \

arch/sparc/kernel/Makefile

@@ -2,7 +2,7 @@
 # Makefile for the linux kernel.
 #
 
-extra-y		:= head.o init_task.o
+extra-y		:= head.o init_task.o vmlinux.lds.s
 
 EXTRA_AFLAGS	:= -ansi
 

arch/sparc64/kernel/Makefile

@@ -5,7 +5,7 @@
 EXTRA_AFLAGS := -ansi
 EXTRA_CFLAGS := -Werror
 
-extra-y		:= head.o init_task.o
+extra-y		:= head.o init_task.o vmlinux.lds.s
 
 obj-y		:= process.o setup.o cpu.o idprom.o \
 		   traps.o devices.o auxio.o \

arch/um/kernel/Makefile

@@ -3,6 +3,8 @@
 # Licensed under the GPL
 #
 
+extra-y := vmlinux.lds.s
+
 obj-y = checksum.o config.o exec_kern.o exitcode.o frame_kern.o frame.o \
 	helper.o init_task.o irq.o irq_user.o ksyms.o mem.o mem_user.o \
 	process.o process_kern.o ptrace.o reboot.o resource.o sigio_user.o \

arch/v850/kernel/Makefile

@@ -9,7 +9,7 @@
 # for more details.
 #
 
-extra-y := head.o init_task.o
+extra-y := head.o init_task.o vmlinux.lds.s
 
 obj-y += intv.o entry.o process.o syscalls.o time.o semaphore.o setup.o \
 	 signal.o irq.o mach.o ptrace.o bug.o

arch/x86_64/kernel/Makefile

@@ -2,7 +2,7 @@
 # Makefile for the linux kernel.
 #
 
-extra-y 	:= head.o head64.o init_task.o
+extra-y 	:= head.o head64.o init_task.o vmlinux.lds.s
 EXTRA_AFLAGS	:= -traditional
 obj-y	:= process.o semaphore.o signal.o entry.o traps.o irq.o \
 		ptrace.o i8259.o ioport.o ldt.o setup.o time.o sys_x86_64.o \