Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <20210413001110.7209bae6@xhacker> <20210413001159.341a95d6@xhacker>
In-Reply-To: <20210413001159.341a95d6@xhacker>
From:   Anup Patel <anup@brainfault.org>
Date:   Tue, 13 Apr 2021 09:19:59 +0530
Message-ID: <CAAhSdy3iiJniE3ubPjSZvtVtT7tf5OW8zNONcEbAvrVmLXAjBA@mail.gmail.com>
Subject: Re: [PATCH v3 01/10] riscv: mm: Remove setup_zero_page()
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>,
        Martin KaFai Lau <kafai@fb.com>,
        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>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Mon, Apr 12, 2021 at 9:47 PM Jisheng Zhang <jszhang3@mail.ustc.edu.cn> wrote:
>
> From: Jisheng Zhang <jszhang@kernel.org>
>
> The empty_zero_page sits at .bss..page_aligned section, so will be
> cleared to zero during clearing bss, we don't need to clear it again.
>
> Signed-off-by: Jisheng Zhang <jszhang@kernel.org>

Looks good to me.

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

Regards,
Anup

> ---
>  arch/riscv/mm/init.c | 6 ------
>  1 file changed, 6 deletions(-)
>
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 7f5036fbee8c..dbeaa4144e4d 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -57,11 +57,6 @@ static void __init zone_sizes_init(void)
>         free_area_init(max_zone_pfns);
>  }
>
> -static void setup_zero_page(void)
> -{
> -       memset((void *)empty_zero_page, 0, PAGE_SIZE);
> -}
> -
>  #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
>  static inline void print_mlk(char *name, unsigned long b, unsigned long t)
>  {
> @@ -589,7 +584,6 @@ void mark_rodata_ro(void)
>  void __init paging_init(void)
>  {
>         setup_vm_final();
> -       setup_zero_page();
>  }
>
>  void __init misc_mem_init(void)
> --
> 2.31.0
>
>