[PATCH riscv/for-next 2/4] riscv: export patch_insn_write

[Andy Chiu]

On Thu, Jun 9, 2022 at 3:21 PM Andy Chiu <andy.chiu at sifive.com> wrote:
>
> So that we may patch code without issuing fence.i
>
> Signed-off-by: Andy Chiu <andy.chiu at sifive.com>
> Reviewed-by: Greentime Hu <greentime.hu at sifive.com>
> Reviewed-by: Zong Li <zong.li at sifive.com>
> Acked-by: Steven Rostedt (Google) <rostedt at goodmis.org>
> ---
>  arch/riscv/include/asm/patch.h | 1 +
>  arch/riscv/kernel/patch.c      | 4 ++--
>  2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/include/asm/patch.h b/arch/riscv/include/asm/patch.h
> index 9a7d7346001e..327e99114d67 100644
> --- a/arch/riscv/include/asm/patch.h
> +++ b/arch/riscv/include/asm/patch.h
> @@ -6,6 +6,7 @@
>  #ifndef _ASM_RISCV_PATCH_H
>  #define _ASM_RISCV_PATCH_H
>
> +int patch_insn_write(void *addr, const void *insn, size_t len);
>  int patch_text_nosync(void *addr, const void *insns, size_t len);
>  int patch_text(void *addr, u32 insn);
>
> diff --git a/arch/riscv/kernel/patch.c b/arch/riscv/kernel/patch.c
> index 765004b60513..6f7757ce50dc 100644
> --- a/arch/riscv/kernel/patch.c
> +++ b/arch/riscv/kernel/patch.c
> @@ -49,7 +49,7 @@ static void patch_unmap(int fixmap)
>  }
>  NOKPROBE_SYMBOL(patch_unmap);
>
> -static int patch_insn_write(void *addr, const void *insn, size_t len)
> +int patch_insn_write(void *addr, const void *insn, size_t len)
>  {
>         void *waddr = addr;
>         bool across_pages = (((uintptr_t) addr & ~PAGE_MASK) + len) > PAGE_SIZE;
> @@ -78,7 +78,7 @@ static int patch_insn_write(void *addr, const void *insn, size_t len)
>  }
>  NOKPROBE_SYMBOL(patch_insn_write);
>  #else
> -static int patch_insn_write(void *addr, const void *insn, size_t len)
> +int patch_insn_write(void *addr, const void *insn, size_t len)
>  {
>         return copy_to_kernel_nofault(addr, insn, len);
>  }
> --
> 2.36.0
>

Loop in: Guo Ren