kbuild: remove head-y syntax

Kbuild puts the objects listed in head-y at the head of vmlinux.
Conventionally, we do this for head*.S, which contains the kernel entry
point.

A counter approach is to control the section order by the linker script.
Actually, the code marked as __HEAD goes into the ".head.text" section,
which is placed before the normal ".text" section.

I do not know if both of them are needed. From the build system
perspective, head-y is not mandatory. If you can achieve the proper code
placement by the linker script only, it would be cleaner.

I collected the current head-y objects into head-object-list.txt. It is
a whitelist. My hope is it will be reduced in the long run.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>

1 files changed, 0 insertions, 12 deletions

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 02742facf895..89c27827a11f 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -226,18 +226,6 @@ KBUILD_CFLAGS += $(cpu-as-y)
 KBUILD_AFLAGS += $(aflags-y)
 KBUILD_CFLAGS += $(cflags-y)
 
-head-$(CONFIG_PPC64)		:= arch/powerpc/kernel/head_64.o
-head-$(CONFIG_PPC_BOOK3S_32)	:= arch/powerpc/kernel/head_book3s_32.o
-head-$(CONFIG_PPC_8xx)		:= arch/powerpc/kernel/head_8xx.o
-head-$(CONFIG_40x)		:= arch/powerpc/kernel/head_40x.o
-head-$(CONFIG_44x)		:= arch/powerpc/kernel/head_44x.o
-head-$(CONFIG_FSL_BOOKE)	:= arch/powerpc/kernel/head_fsl_booke.o
-
-head-$(CONFIG_PPC64)		+= arch/powerpc/kernel/entry_64.o
-head-$(CONFIG_PPC_FPU)		+= arch/powerpc/kernel/fpu.o
-head-$(CONFIG_ALTIVEC)		+= arch/powerpc/kernel/vector.o
-head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE)  += arch/powerpc/kernel/prom_init.o
-
 # Default to zImage, override when needed
 all: zImage