linux-kernel - Re: [PATCH v2 09/12] powerpc/inst: Refactor PPC32 and PPC64 versions

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Date:   Tue, 15 Jun 2021 13:48:23 +1000
From:   Jordan Niethe <jniethe5@...il.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2 09/12] powerpc/inst: Refactor PPC32 and PPC64 versions

On Thu, May 20, 2021 at 11:50 PM Christophe Leroy
<christophe.leroy@...roup.eu> wrote:
>
> ppc_inst() ppc_inst_prefixed() ppc_inst_swab() can easily
> be made common to both PPC32 and PPC64.
>
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
>  arch/powerpc/include/asm/inst.h | 49 +++++++++------------------------
>  1 file changed, 13 insertions(+), 36 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/inst.h b/arch/powerpc/include/asm/inst.h
> index 32d318c3b180..e009e94e90b2 100644
> --- a/arch/powerpc/include/asm/inst.h
> +++ b/arch/powerpc/include/asm/inst.h
> @@ -60,9 +60,9 @@ static inline int ppc_inst_primary_opcode(struct ppc_inst x)
>         return ppc_inst_val(x) >> 26;
>  }
>
> -#ifdef CONFIG_PPC64
>  #define ppc_inst(x) ((struct ppc_inst){ .val = (x) })
>
> +#ifdef CONFIG_PPC64
>  #define ppc_inst_prefix(x, y) ((struct ppc_inst){ .val = (x), .suffix = (y) })
>
>  static inline u32 ppc_inst_suffix(struct ppc_inst x)
> @@ -70,57 +70,34 @@ static inline u32 ppc_inst_suffix(struct ppc_inst x)
>         return x.suffix;
>  }
>
> -static inline bool ppc_inst_prefixed(struct ppc_inst x)
> -{
> -       return ppc_inst_primary_opcode(x) == OP_PREFIX;
> -}
> +#else
> +#define ppc_inst_prefix(x, y) ppc_inst(x)
>
> -static inline struct ppc_inst ppc_inst_swab(struct ppc_inst x)
> +static inline u32 ppc_inst_suffix(struct ppc_inst x)
>  {
> -       return ppc_inst_prefix(swab32(ppc_inst_val(x)), swab32(ppc_inst_suffix(x)));
> +       return 0;
>  }
>
> +#endif /* CONFIG_PPC64 */
> +
>  static inline struct ppc_inst ppc_inst_read(const unsigned int *ptr)
>  {
> -       u32 val, suffix;
> -
> -       val = *ptr;
> -       if ((val >> 26) == OP_PREFIX) {
> -               suffix = *(ptr + 1);
> -               return ppc_inst_prefix(val, suffix);
> -       } else {
> -               return ppc_inst(val);
> -       }
> +       if (IS_ENABLED(CONFIG_PPC64) && (*ptr >> 26) == OP_PREFIX)
> +               return ppc_inst_prefix(*ptr, *(ptr + 1));
> +       else
> +               return ppc_inst(*ptr);
>  }
>
> -#else
> -
> -#define ppc_inst(x) ((struct ppc_inst){ .val = x })
> -
> -#define ppc_inst_prefix(x, y) ppc_inst(x)
> -
>  static inline bool ppc_inst_prefixed(struct ppc_inst x)
>  {
> -       return false;
> -}
> -
> -static inline u32 ppc_inst_suffix(struct ppc_inst x)
> -{
> -       return 0;
> +       return IS_ENABLED(CONFIG_PPC64) && ppc_inst_primary_opcode(x) == OP_PREFIX;
>  }
>
>  static inline struct ppc_inst ppc_inst_swab(struct ppc_inst x)
>  {
> -       return ppc_inst(swab32(ppc_inst_val(x)));
> -}
> -
> -static inline struct ppc_inst ppc_inst_read(const unsigned int *ptr)
> -{
> -       return ppc_inst(*ptr);
> +       return ppc_inst_prefix(swab32(ppc_inst_val(x)), swab32(ppc_inst_suffix(x)));
>  }
>
> -#endif /* CONFIG_PPC64 */
> -
>  static inline bool ppc_inst_equal(struct ppc_inst x, struct ppc_inst y)
>  {
>         if (ppc_inst_val(x) != ppc_inst_val(y))
> --
> 2.25.0
>
Reviewed by: Jordan Niethe <jniethe5@...il.com>