Re: [PATCH v3 04/13] riscv: hwcap: make ISA extension ids can be used in asm

Conor Dooley
2023-01-12T21:37:21Z

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Hey Jisheng,

On Thu, Jan 12, 2023 at 01:10:18AM +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.

From v2:
Which base ISA extension IDs? Changelog should match the patch contents,
and it's a little unclear here since the base ISA extension IDs are
visible here but in the context not the diff.

How about something like:
"So that ISA extensions can be used in assembly files, convert the
multi-letter RISC-V ISA extension IDs enums to macros.
In order to make them visible, move the #ifndef __ASSEMBLY__ guard
to a later point in the header"

Pedantry perhaps, but referring to moving the base IDs looks odd, since
that is not what git thinks you did - even if that is the copy paste
operation you carried out.

Content itself is
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>

Thanks,
Conor.

> Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
> Reviewed-by: Heiko Stuebner <heiko@sntech.de>
> Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
> ---
> arch/riscv/include/asm/hwcap.h | 45 ++++++++++++++++------------------
> 1 file changed, 21 insertions(+), 24 deletions(-)
>
> diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
> index 86328e3acb02..09a7767723f6 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')
> @@ -46,22 +32,33 @@ 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_SVINVAL,
> - RISCV_ISA_EXT_ID_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_SVINVAL 31
> +
> +#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,
> };
> -static_assert(RISCV_ISA_EXT_ID_MAX <= RISCV_ISA_EXT_MAX);
> +
> +extern unsigned long elf_hwcap;
> +
>
> /*
> * This enum represents the logical ID for each RISC-V ISA extension static
> --
> 2.38.1
>
>
> _______________________________________________
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> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

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