linux-kernel - Re: [PATCH 3/8] riscv: hwcap: make ISA extension ids can be used in asm

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Date:   Thu, 6 Oct 2022 15:15:28 +0200
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Jisheng Zhang <jszhang@...nel.org>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/8] riscv: hwcap: make ISA extension ids can be used in
 asm

On Thu, Oct 06, 2022 at 03:08:13PM +0800, Jisheng Zhang wrote:
> We will make use of ISA extension in asm files, so make the multi-letter
> RISC-V ISA extension IDs macros rather than enums and move them and
> those base ISA extension IDs to suitable place.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> ---
>  arch/riscv/include/asm/hwcap.h | 45 +++++++++++++++++-----------------
>  1 file changed, 23 insertions(+), 22 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> index 6f59ec64175e..6cf445653911 100644
> --- a/arch/riscv/include/asm/hwcap.h
> +++ b/arch/riscv/include/asm/hwcap.h
> @@ -12,20 +12,6 @@
>  #include <linux/bits.h>
>  #include <uapi/asm/hwcap.h>
>  
> -#ifndef __ASSEMBLY__
> -#include <linux/jump_label.h>
> -/*
> - * This yields a mask that user programs can use to figure out what
> - * instruction set this cpu supports.
> - */
> -#define ELF_HWCAP		(elf_hwcap)
> -
> -enum {
> -	CAP_HWCAP = 1,
> -};
> -
> -extern unsigned long elf_hwcap;
> -
>  #define RISCV_ISA_EXT_a		('a' - 'a')
>  #define RISCV_ISA_EXT_c		('c' - 'a')
>  #define RISCV_ISA_EXT_d		('d' - 'a')
> @@ -46,21 +32,36 @@ extern unsigned long elf_hwcap;
>  #define RISCV_ISA_EXT_BASE 26
>  
>  /*
> - * This enum represent the logical ID for each multi-letter RISC-V ISA extension.
> + * These macros represent the logical ID for each multi-letter RISC-V ISA extension.
>   * The logical ID should start from RISCV_ISA_EXT_BASE and must not exceed
>   * RISCV_ISA_EXT_MAX. 0-25 range is reserved for single letter
>   * extensions while all the multi-letter extensions should define the next
>   * available logical extension id.
>   */
> -enum riscv_isa_ext_id {
> -	RISCV_ISA_EXT_SSCOFPMF = RISCV_ISA_EXT_BASE,
> -	RISCV_ISA_EXT_SVPBMT,
> -	RISCV_ISA_EXT_ZICBOM,
> -	RISCV_ISA_EXT_ZIHINTPAUSE,
> -	RISCV_ISA_EXT_SSTC,
> -	RISCV_ISA_EXT_ID_MAX = RISCV_ISA_EXT_MAX,
> +#define RISCV_ISA_EXT_SSCOFPMF 		26
> +#define RISCV_ISA_EXT_SVPBMT		27
> +#define RISCV_ISA_EXT_ZICBOM		28
> +#define RISCV_ISA_EXT_ZIHINTPAUSE	29
> +#define RISCV_ISA_EXT_SSTC		30
> +
> +#define RISCV_ISA_EXT_ID_MAX		RISCV_ISA_EXT_MAX

afaict, RISCV_ISA_EXT_ID_MAX is ununsed and can be removed.

> +
> +
> +#ifndef __ASSEMBLY__
> +#include <linux/jump_label.h>
> +/*
> + * This yields a mask that user programs can use to figure out what
> + * instruction set this cpu supports.
> + */
> +#define ELF_HWCAP		(elf_hwcap)
> +
> +enum {
> +	CAP_HWCAP = 1,
>  };
>  
> +extern unsigned long elf_hwcap;
> +
> +
>  /*
>   * This enum represents the logical ID for each RISC-V ISA extension static
>   * keys. We can use static key to optimize code path if some ISA extensions
> -- 
> 2.37.2
>

Otherwise,

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>