linux-kernel - Re: [PATCH] RISC-V: Remove unused code from STRICT_KERNEL

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Date:   Tue, 05 May 2020 16:55:28 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     Atish Patra <Atish.Patra@....com>
CC:     linux-kernel@...r.kernel.org, Atish Patra <Atish.Patra@....com>,
        aou@...s.berkeley.edu, Anup Patel <Anup.Patel@....com>,
        linux-riscv@...ts.infradead.org,
        Paul Walmsley <paul.walmsley@...ive.com>, zong.li@...ive.com
Subject:     Re: [PATCH] RISC-V: Remove unused code from STRICT_KERNEL_RWX

On Sun, 03 May 2020 21:03:19 PDT (-0700), Atish Patra wrote:
> This patch removes the unused functions set_kernel_text_rw/ro.
> Currently, it is not being invoked from anywhere and no other architecture
> (except arm) uses this code. Even in ARM, these functions are not invoked
> from anywhere currently.
>
> Fixes: d27c3c90817e ("riscv: add STRICT_KERNEL_RWX support")
>
> Signed-off-by: Atish Patra <atish.patra@....com>
> ---
>  arch/riscv/mm/init.c | 16 ----------------
>  1 file changed, 16 deletions(-)
>
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index b55be44ff9bd..ba60a581e9b6 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -501,22 +501,6 @@ static inline void setup_vm_final(void)
>  #endif /* CONFIG_MMU */
>
>  #ifdef CONFIG_STRICT_KERNEL_RWX
> -void set_kernel_text_rw(void)
> -{
> -	unsigned long text_start = (unsigned long)_text;
> -	unsigned long text_end = (unsigned long)_etext;
> -
> -	set_memory_rw(text_start, (text_end - text_start) >> PAGE_SHIFT);
> -}
> -
> -void set_kernel_text_ro(void)
> -{
> -	unsigned long text_start = (unsigned long)_text;
> -	unsigned long text_end = (unsigned long)_etext;
> -
> -	set_memory_ro(text_start, (text_end - text_start) >> PAGE_SHIFT);
> -}
> -
>  void mark_rodata_ro(void)
>  {
>  	unsigned long text_start = (unsigned long)_text;

Thanks, this is on fixes.  Are you going to remove the ARM code as well?