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From:   Anup Patel <anup@brainfault.org>
Date:   Fri, 2 Apr 2021 09:39:32 +0530
Message-ID: <CAAhSdy0N427hw6sK5NEbrs_bb2N9y6aDOrCLO+mcpysLvaaoPQ@mail.gmail.com>
Subject: Re: [PATCH v2 2/9] riscv: Mark some global variables __ro_after_init
To:     Jisheng Zhang <jszhang3@mail.ustc.edu.cn>
Cc:     Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        Alexander Potapenko <glider@google.com>,
        Andrey Konovalov <andreyknvl@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= <bjorn@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andrii@kernel.org>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@kernel.org>,
        Luke Nelson <luke.r.nels@gmail.com>,
        Xi Wang <xi.wang@gmail.com>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        "linux-kernel@vger.kernel.org List" <linux-kernel@vger.kernel.org>,
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On Wed, Mar 31, 2021 at 10:01 PM Jisheng Zhang
<jszhang3@mail.ustc.edu.cn> wrote:
>
> From: Jisheng Zhang <jszhang@kernel.org>
>
> All of these are never modified after init, so they can be
> __ro_after_init.
>
> Signed-off-by: Jisheng Zhang <jszhang@kernel.org>

Looks good to me.

Reviewed-by: Anup Patel <anup@brainfault.org>

Regards,
Anup

> ---
>  arch/riscv/kernel/sbi.c  | 8 ++++----
>  arch/riscv/kernel/smp.c  | 4 ++--
>  arch/riscv/kernel/time.c | 2 +-
>  arch/riscv/kernel/vdso.c | 4 ++--
>  arch/riscv/mm/init.c     | 6 +++---
>  5 files changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
> index d3bf756321a5..cbd94a72eaa7 100644
> --- a/arch/riscv/kernel/sbi.c
> +++ b/arch/riscv/kernel/sbi.c
> @@ -11,14 +11,14 @@
>  #include <asm/smp.h>
>
>  /* default SBI version is 0.1 */
> -unsigned long sbi_spec_version = SBI_SPEC_VERSION_DEFAULT;
> +unsigned long sbi_spec_version __ro_after_init = SBI_SPEC_VERSION_DEFAULT;
>  EXPORT_SYMBOL(sbi_spec_version);
>
> -static void (*__sbi_set_timer)(uint64_t stime);
> -static int (*__sbi_send_ipi)(const unsigned long *hart_mask);
> +static void (*__sbi_set_timer)(uint64_t stime) __ro_after_init;
> +static int (*__sbi_send_ipi)(const unsigned long *hart_mask) __ro_after_init;
>  static int (*__sbi_rfence)(int fid, const unsigned long *hart_mask,
>                            unsigned long start, unsigned long size,
> -                          unsigned long arg4, unsigned long arg5);
> +                          unsigned long arg4, unsigned long arg5) __ro_after_init;
>
>  struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
>                         unsigned long arg1, unsigned long arg2,
> diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
> index ea028d9e0d24..504284d49135 100644
> --- a/arch/riscv/kernel/smp.c
> +++ b/arch/riscv/kernel/smp.c
> @@ -30,7 +30,7 @@ enum ipi_message_type {
>         IPI_MAX
>  };
>
> -unsigned long __cpuid_to_hartid_map[NR_CPUS] = {
> +unsigned long __cpuid_to_hartid_map[NR_CPUS] __ro_after_init = {
>         [0 ... NR_CPUS-1] = INVALID_HARTID
>  };
>
> @@ -85,7 +85,7 @@ static void ipi_stop(void)
>                 wait_for_interrupt();
>  }
>
> -static struct riscv_ipi_ops *ipi_ops;
> +static struct riscv_ipi_ops *ipi_ops __ro_after_init;
>
>  void riscv_set_ipi_ops(struct riscv_ipi_ops *ops)
>  {
> diff --git a/arch/riscv/kernel/time.c b/arch/riscv/kernel/time.c
> index 1b432264f7ef..8217b0f67c6c 100644
> --- a/arch/riscv/kernel/time.c
> +++ b/arch/riscv/kernel/time.c
> @@ -11,7 +11,7 @@
>  #include <asm/processor.h>
>  #include <asm/timex.h>
>
> -unsigned long riscv_timebase;
> +unsigned long riscv_timebase __ro_after_init;
>  EXPORT_SYMBOL_GPL(riscv_timebase);
>
>  void __init time_init(void)
> diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
> index 3f1d35e7c98a..25a3b8849599 100644
> --- a/arch/riscv/kernel/vdso.c
> +++ b/arch/riscv/kernel/vdso.c
> @@ -20,8 +20,8 @@
>
>  extern char vdso_start[], vdso_end[];
>
> -static unsigned int vdso_pages;
> -static struct page **vdso_pagelist;
> +static unsigned int vdso_pages __ro_after_init;
> +static struct page **vdso_pagelist __ro_after_init;
>
>  /*
>   * The vDSO data page.
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 76bf2de8aa59..719ec72ef069 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -149,11 +149,11 @@ void __init setup_bootmem(void)
>  }
>
>  #ifdef CONFIG_MMU
> -static struct pt_alloc_ops pt_ops;
> +static struct pt_alloc_ops pt_ops __ro_after_init;
>
> -unsigned long va_pa_offset;
> +unsigned long va_pa_offset __ro_after_init;
>  EXPORT_SYMBOL(va_pa_offset);
> -unsigned long pfn_base;
> +unsigned long pfn_base __ro_after_init;
>  EXPORT_SYMBOL(pfn_base);
>
>  pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
> --
> 2.31.0
>
>
>
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