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References: <20210721075937.696811-1-alex@ghiti.fr> <20210721075937.696811-4-alex@ghiti.fr>
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From:   Vitaly Wool <vitaly.wool@konsulko.com>
Date:   Sun, 8 Aug 2021 14:27:25 +0200
Message-ID: <CAM4kBBKEU4zKkRJKe27Y0uvt7SN=K6HsyNMdPu7Y+WWyh7QRHg@mail.gmail.com>
Subject: Re: [PATCH -fixes 3/3] riscv: Optimize kernel virtual address
 conversion macro
To:     Alexandre Ghiti <alex@ghiti.fr>
Cc:     Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        LKML <linux-kernel@vger.kernel.org>
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On Wed, Jul 21, 2021 at 10:04 AM Alexandre Ghiti <alex@ghiti.fr> wrote:
>
> The current test in kernel_mapping_va_to_pa only applies when
> CONFIG_XIP_KERNEL is set, so use IS_ENABLED to optimize this macro at
> compile-time in standard kernels that do not require this test.
>
> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>

Just in case you need it, here comes

Reviewed-By: Vitaly Wool <vitaly.wool@konsulko.com>

> ---
>  arch/riscv/include/asm/page.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> index b0ca5058e7ae..10dc063868f6 100644
> --- a/arch/riscv/include/asm/page.h
> +++ b/arch/riscv/include/asm/page.h
> @@ -123,7 +123,7 @@ extern phys_addr_t phys_ram_base;
>  #define linear_mapping_va_to_pa(x)     ((unsigned long)(x) - kernel_map.va_pa_offset)
>  #define kernel_mapping_va_to_pa(y) ({                                          \
>         unsigned long _y = y;                                                   \
> -       (_y < kernel_map.virt_addr + XIP_OFFSET) ?                                      \
> +       (IS_ENABLED(CONFIG_XIP_KERNEL) && _y < kernel_map.virt_addr + XIP_OFFSET) ?     \
>                 ((unsigned long)(_y) - kernel_map.va_kernel_xip_pa_offset) :            \
>                 ((unsigned long)(_y) - kernel_map.va_kernel_pa_offset - XIP_OFFSET);    \
>         })
> --
> 2.30.2
>
>
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