linux-kernel - Re: [PATCH] sh: migrate to the generic rule for built-in DTB

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Message-ID: <f447d1a9256033253d9bd9193ad639479e7c8575.camel@physik.fu-berlin.de>
Date: Thu, 30 Jan 2025 09:39:49 +0100
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Masahiro Yamada <masahiroy@...nel.org>, Yoshinori Sato
	 <ysato@...rs.sourceforge.jp>, Rich Felker <dalias@...c.org>, 
	linux-sh@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>, 
 Krzysztof Kozlowski	 <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>,
 devicetree@...r.kernel.org
Subject: Re: [PATCH] sh: migrate to the generic rule for built-in DTB

Hi Masahiro,

On Sun, 2024-12-22 at 09:32 +0900, Masahiro Yamada wrote:
> Commit 654102df2ac2 ("kbuild: add generic support for built-in boot
> DTBs") introduced generic support for built-in DTBs.
> 
> Select GENERIC_BUILTIN_DTB when built-in DTB support is enabled.
> 
> To keep consistency across architectures, this commit also renames
> CONFIG_USE_BUILTIN_DTB to CONFIG_BUILTIN_DTB, and
> CONFIG_BUILTIN_DTB_SOURCE to CONFIG_BUILTIN_DTB_NAME.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
>  arch/sh/Kbuild            | 1 -
>  arch/sh/Kconfig           | 7 ++++---
>  arch/sh/boot/dts/Makefile | 2 +-
>  arch/sh/kernel/setup.c    | 4 ++--
>  4 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/sh/Kbuild b/arch/sh/Kbuild
> index 056efec72c2a..0da6c6d6821a 100644
> --- a/arch/sh/Kbuild
> +++ b/arch/sh/Kbuild
> @@ -1,7 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  obj-y				+= kernel/ mm/ boards/
>  obj-$(CONFIG_SH_FPU_EMU)	+= math-emu/
> -obj-$(CONFIG_USE_BUILTIN_DTB)	+= boot/dts/
>  
>  obj-$(CONFIG_HD6446X_SERIES)	+= cchips/hd6446x/
>  
> diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
> index 04ff5fb9242e..89185af7bcc9 100644
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -648,10 +648,11 @@ endmenu
>  
>  menu "Boot options"
>  
> -config USE_BUILTIN_DTB
> +config BUILTIN_DTB
>  	bool "Use builtin DTB"
>  	default n
>  	depends on SH_DEVICE_TREE
> +	select GENERIC_BUILTIN_DTB
>  	help
>  	  Link a device tree blob for particular hardware into the kernel,
>  	  suppressing use of the DTB pointer provided by the bootloader.
> @@ -659,10 +660,10 @@ config USE_BUILTIN_DTB
>  	  not capable of providing a DTB to the kernel, or for experimental
>  	  hardware without stable device tree bindings.
>  
> -config BUILTIN_DTB_SOURCE
> +config BUILTIN_DTB_NAME
>  	string "Source file for builtin DTB"
>  	default ""
> -	depends on USE_BUILTIN_DTB
> +	depends on BUILTIN_DTB
>  	help
>  	  Base name (without suffix, relative to arch/sh/boot/dts) for the
>  	  a DTS file that will be used to produce the DTB linked into the
> diff --git a/arch/sh/boot/dts/Makefile b/arch/sh/boot/dts/Makefile
> index 4a6dec9714a9..d109978a5eb9 100644
> --- a/arch/sh/boot/dts/Makefile
> +++ b/arch/sh/boot/dts/Makefile
> @@ -1,2 +1,2 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> -obj-$(CONFIG_USE_BUILTIN_DTB) += $(addsuffix .dtb.o, $(CONFIG_BUILTIN_DTB_SOURCE))
> +obj-$(CONFIG_BUILTIN_DTB) += $(addsuffix .dtb.o, $(CONFIG_BUILTIN_DTB_NAME))
> diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
> index f2b6f16a46b8..039a51291002 100644
> --- a/arch/sh/kernel/setup.c
> +++ b/arch/sh/kernel/setup.c
> @@ -249,7 +249,7 @@ void __ref sh_fdt_init(phys_addr_t dt_phys)
>  	/* Avoid calling an __init function on secondary cpus. */
>  	if (done) return;
>  
> -#ifdef CONFIG_USE_BUILTIN_DTB
> +#ifdef CONFIG_BUILTIN_DTB
>  	dt_virt = __dtb_start;
>  #else
>  	dt_virt = phys_to_virt(dt_phys);
> @@ -323,7 +323,7 @@ void __init setup_arch(char **cmdline_p)
>  	sh_early_platform_driver_probe("earlyprintk", 1, 1);
>  
>  #ifdef CONFIG_OF_EARLY_FLATTREE
> -#ifdef CONFIG_USE_BUILTIN_DTB
> +#ifdef CONFIG_BUILTIN_DTB
>  	unflatten_and_copy_device_tree();
>  #else
>  	unflatten_device_tree();

Looks like a good idea to address possible race conditions during build.

Reviewed-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>

Thanks,
Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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