linux-kernel - Re: [v2 PATCH 1/5] efi: Move arm-stub to a common file

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Date:   Tue, 21 Apr 2020 12:19:37 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     Atish Patra <Atish.Patra@....com>, will@...nel.org
CC:     linux-kernel@...r.kernel.org, Atish Patra <Atish.Patra@....com>,
        ardb@...nel.org, Arnd Bergmann <arnd@...db.de>,
        catalin.marinas@....com, Greg KH <gregkh@...uxfoundation.org>,
        mingo@...nel.org, linux-efi@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, masahiroy@...nel.org,
        linux@...linux.org.uk
Subject:     Re: [v2 PATCH 1/5] efi: Move arm-stub to a common file

On Mon, 13 Apr 2020 14:29:03 PDT (-0700), Atish Patra wrote:
> Most of the arm-stub code is written in an architecture independent manner.
> As a result, RISC-V can reuse most of the arm-stub code.
>
> Rename the arm-stub.c to efi-stub.c so that ARM, ARM64 and RISC-V can use it.
> This patch doesn't introduce any functional changes.
>
> Signed-off-by: Atish Patra <atish.patra@....com>

We'll need a bunch of Acked-bys for these, but I'm happy to take this in my
tree.

> ---
>  arch/arm/Kconfig                                     |  2 +-
>  arch/arm64/Kconfig                                   |  2 +-
>  drivers/firmware/efi/Kconfig                         |  4 ++--
>  drivers/firmware/efi/libstub/Makefile                | 12 ++++++------
>  .../firmware/efi/libstub/{arm-stub.c => efi-stub.c}  |  0
>  5 files changed, 10 insertions(+), 10 deletions(-)
>  rename drivers/firmware/efi/libstub/{arm-stub.c => efi-stub.c} (100%)
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 66a04f6f4775..165987aa5bcd 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1954,7 +1954,7 @@ config EFI
>  	select UCS2_STRING
>  	select EFI_PARAMS_FROM_FDT
>  	select EFI_STUB
> -	select EFI_ARMSTUB
> +	select EFI_GENERIC_STUB
>  	select EFI_RUNTIME_WRAPPERS
>  	---help---
>  	  This option provides support for runtime services provided
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 40fb05d96c60..32d818c5ccda 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1785,7 +1785,7 @@ config EFI
>  	select EFI_PARAMS_FROM_FDT
>  	select EFI_RUNTIME_WRAPPERS
>  	select EFI_STUB
> -	select EFI_ARMSTUB
> +	select EFI_GENERIC_STUB
>  	default y
>  	help
>  	  This option provides support for runtime services provided
> diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
> index 613828d3f106..2a2b2b96a1dc 100644
> --- a/drivers/firmware/efi/Kconfig
> +++ b/drivers/firmware/efi/Kconfig
> @@ -106,12 +106,12 @@ config EFI_PARAMS_FROM_FDT
>  config EFI_RUNTIME_WRAPPERS
>  	bool
>
> -config EFI_ARMSTUB
> +config EFI_GENERIC_STUB
>  	bool
>
>  config EFI_ARMSTUB_DTB_LOADER
>  	bool "Enable the DTB loader"
> -	depends on EFI_ARMSTUB
> +	depends on EFI_GENERIC_STUB
>  	default y
>  	help
>  	  Select this config option to add support for the dtb= command
> diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
> index 094eabdecfe6..d590504541f6 100644
> --- a/drivers/firmware/efi/libstub/Makefile
> +++ b/drivers/firmware/efi/libstub/Makefile
> @@ -23,7 +23,7 @@ cflags-$(CONFIG_ARM)		:= $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \
>  				   -fno-builtin -fpic \
>  				   $(call cc-option,-mno-single-pic-base)
>
> -cflags-$(CONFIG_EFI_ARMSTUB)	+= -I$(srctree)/scripts/dtc/libfdt
> +cflags-$(CONFIG_EFI_GENERIC_STUB)	+= -I$(srctree)/scripts/dtc/libfdt
>
>  KBUILD_CFLAGS			:= $(cflags-y) -DDISABLE_BRANCH_PROFILING \
>  				   -include $(srctree)/drivers/firmware/efi/libstub/hidden.h \
> @@ -45,13 +45,13 @@ lib-y				:= efi-stub-helper.o gop.o secureboot.o tpm.o \
>  				   skip_spaces.o lib-cmdline.o lib-ctype.o
>
>  # include the stub's generic dependencies from lib/ when building for ARM/arm64
> -arm-deps-y := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c fdt_empty_tree.c fdt_sw.c
> +efi-deps-y := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c fdt_empty_tree.c fdt_sw.c
>
>  $(obj)/lib-%.o: $(srctree)/lib/%.c FORCE
>  	$(call if_changed_rule,cc_o_c)
>
> -lib-$(CONFIG_EFI_ARMSTUB)	+= arm-stub.o fdt.o string.o \
> -				   $(patsubst %.c,lib-%.o,$(arm-deps-y))
> +lib-$(CONFIG_EFI_GENERIC_STUB)		+= efi-stub.o fdt.o string.o \
> +				   $(patsubst %.c,lib-%.o,$(efi-deps-y))
>
>  lib-$(CONFIG_ARM)		+= arm32-stub.o
>  lib-$(CONFIG_ARM64)		+= arm64-stub.o
> @@ -73,8 +73,8 @@ CFLAGS_arm64-stub.o		:= -DTEXT_OFFSET=$(TEXT_OFFSET)
>  # a verification pass to see if any absolute relocations exist in any of the
>  # object files.
>  #
> -extra-$(CONFIG_EFI_ARMSTUB)	:= $(lib-y)
> -lib-$(CONFIG_EFI_ARMSTUB)	:= $(patsubst %.o,%.stub.o,$(lib-y))
> +extra-$(CONFIG_EFI_GENERIC_STUB)	:= $(lib-y)
> +lib-$(CONFIG_EFI_GENERIC_STUB)	:= $(patsubst %.o,%.stub.o,$(lib-y))
>
>  STUBCOPY_FLAGS-$(CONFIG_ARM64)	+= --prefix-alloc-sections=.init \
>  				   --prefix-symbols=__efistub_
> diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/efi-stub.c
> similarity index 100%
> rename from drivers/firmware/efi/libstub/arm-stub.c
> rename to drivers/firmware/efi/libstub/efi-stub.c

Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>