Re: [patch 08/17] sh/cpu: Switch to arch_cpu_finalize_init()

[John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>]

On Wed, 2023-06-14 at 01:39 +0200, Thomas Gleixner wrote:
> check_bugs() is about to be phased out. Switch over to the new
> arch_cpu_finalize_init() implementation.
> 
> No functional change.
> 
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
> Cc: Rich Felker <dalias@xxxxxxxx>
> Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
> Cc: linux-sh@xxxxxxxxxxxxxxx
> ---
>  arch/sh/Kconfig                 |    1 
>  arch/sh/include/asm/bugs.h      |   74 ----------------------------------------
>  arch/sh/include/asm/processor.h |    2 +
>  arch/sh/kernel/idle.c           |    1 
>  arch/sh/kernel/setup.c          |   55 +++++++++++++++++++++++++++++
>  5 files changed, 59 insertions(+), 74 deletions(-)
> 
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -6,6 +6,7 @@ config SUPERH
>  	select ARCH_ENABLE_MEMORY_HOTREMOVE if SPARSEMEM && MMU
>  	select ARCH_HAVE_NMI_SAFE_CMPXCHG if (GUSA_RB || CPU_SH4A)
>  	select ARCH_HAS_BINFMT_FLAT if !MMU
> +	select ARCH_HAS_CPU_FINALIZE_INIT
>  	select ARCH_HAS_CURRENT_STACK_POINTER
>  	select ARCH_HAS_GIGANTIC_PAGE
>  	select ARCH_HAS_GCOV_PROFILE_ALL
> --- a/arch/sh/include/asm/bugs.h
> +++ /dev/null
> @@ -1,74 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -#ifndef __ASM_SH_BUGS_H
> -#define __ASM_SH_BUGS_H
> -
> -/*
> - * This is included by init/main.c to check for architecture-dependent bugs.
> - *
> - * Needs:
> - *	void check_bugs(void);
> - */
> -
> -/*
> - * I don't know of any Super-H bugs yet.
> - */
> -
> -#include <asm/processor.h>
> -
> -extern void select_idle_routine(void);
> -
> -static void __init check_bugs(void)
> -{
> -	extern unsigned long loops_per_jiffy;
> -	char *p = &init_utsname()->machine[2]; /* "sh" */
> -
> -	select_idle_routine();
> -
> -	current_cpu_data.loops_per_jiffy = loops_per_jiffy;
> -
> -	switch (current_cpu_data.family) {
> -	case CPU_FAMILY_SH2:
> -		*p++ = '2';
> -		break;
> -	case CPU_FAMILY_SH2A:
> -		*p++ = '2';
> -		*p++ = 'a';
> -		break;
> -	case CPU_FAMILY_SH3:
> -		*p++ = '3';
> -		break;
> -	case CPU_FAMILY_SH4:
> -		*p++ = '4';
> -		break;
> -	case CPU_FAMILY_SH4A:
> -		*p++ = '4';
> -		*p++ = 'a';
> -		break;
> -	case CPU_FAMILY_SH4AL_DSP:
> -		*p++ = '4';
> -		*p++ = 'a';
> -		*p++ = 'l';
> -		*p++ = '-';
> -		*p++ = 'd';
> -		*p++ = 's';
> -		*p++ = 'p';
> -		break;
> -	case CPU_FAMILY_UNKNOWN:
> -		/*
> -		 * Specifically use CPU_FAMILY_UNKNOWN rather than
> -		 * default:, so we're able to have the compiler whine
> -		 * about unhandled enumerations.
> -		 */
> -		break;
> -	}
> -
> -	printk("CPU: %s\n", get_cpu_subtype(&current_cpu_data));
> -
> -#ifndef __LITTLE_ENDIAN__
> -	/* 'eb' means 'Endian Big' */
> -	*p++ = 'e';
> -	*p++ = 'b';
> -#endif
> -	*p = '\0';
> -}
> -#endif /* __ASM_SH_BUGS_H */
> --- a/arch/sh/include/asm/processor.h
> +++ b/arch/sh/include/asm/processor.h
> @@ -166,6 +166,8 @@ extern unsigned int instruction_size(uns
>  #define instruction_size(insn)	(2)
>  #endif
>  
> +void select_idle_routine(void);
> +
>  #endif /* __ASSEMBLY__ */
>  
>  #include <asm/processor_32.h>
> --- a/arch/sh/kernel/idle.c
> +++ b/arch/sh/kernel/idle.c
> @@ -15,6 +15,7 @@
>  #include <linux/irqflags.h>
>  #include <linux/smp.h>
>  #include <linux/atomic.h>
> +#include <asm/processor.h>
>  #include <asm/smp.h>
>  #include <asm/bl_bit.h>
>  
> --- a/arch/sh/kernel/setup.c
> +++ b/arch/sh/kernel/setup.c
> @@ -43,6 +43,7 @@
>  #include <asm/smp.h>
>  #include <asm/mmu_context.h>
>  #include <asm/mmzone.h>
> +#include <asm/processor.h>
>  #include <asm/sparsemem.h>
>  #include <asm/platform_early.h>
>  
> @@ -354,3 +355,57 @@ int test_mode_pin(int pin)
>  {
>  	return sh_mv.mv_mode_pins() & pin;
>  }
> +
> +void __init arch_cpu_finalize_init(void)
> +{
> +	char *p = &init_utsname()->machine[2]; /* "sh" */
> +
> +	select_idle_routine();
> +
> +	current_cpu_data.loops_per_jiffy = loops_per_jiffy;
> +
> +	switch (current_cpu_data.family) {
> +	case CPU_FAMILY_SH2:
> +		*p++ = '2';
> +		break;
> +	case CPU_FAMILY_SH2A:
> +		*p++ = '2';
> +		*p++ = 'a';
> +		break;
> +	case CPU_FAMILY_SH3:
> +		*p++ = '3';
> +		break;
> +	case CPU_FAMILY_SH4:
> +		*p++ = '4';
> +		break;
> +	case CPU_FAMILY_SH4A:
> +		*p++ = '4';
> +		*p++ = 'a';
> +		break;
> +	case CPU_FAMILY_SH4AL_DSP:
> +		*p++ = '4';
> +		*p++ = 'a';
> +		*p++ = 'l';
> +		*p++ = '-';
> +		*p++ = 'd';
> +		*p++ = 's';
> +		*p++ = 'p';
> +		break;
> +	case CPU_FAMILY_UNKNOWN:
> +		/*
> +		 * Specifically use CPU_FAMILY_UNKNOWN rather than
> +		 * default:, so we're able to have the compiler whine
> +		 * about unhandled enumerations.
> +		 */
> +		break;
> +	}
> +
> +	pr_info("CPU: %s\n", get_cpu_subtype(&current_cpu_data));
> +
> +#ifndef __LITTLE_ENDIAN__
> +	/* 'eb' means 'Endian Big' */
> +	*p++ = 'e';
> +	*p++ = 'b';
> +#endif
> +	*p = '\0';
> +}

Acked-by: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>

-- 
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`. `'   Physicist
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