linux-kernel - Re: [PATCH v3 resend 01/15] mm: add setup_initial_init

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Date:   Tue, 8 Jun 2021 20:23:38 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Linux-MM <linux-mm@...ck.org>,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        uclinux-h8-devel@...ts.sourceforge.jp,
        linux-m68k@...ts.linux-m68k.org, openrisc@...ts.librecores.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-sh@...r.kernel.org, linux-s390@...r.kernel.org,
        X86 ML <x86@...nel.org>
Subject: Re: [PATCH v3 resend 01/15] mm: add setup_initial_init_mm() helper

On Tue, Jun 8, 2021 at 1:56 PM Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
>
> Add setup_initial_init_mm() helper to setup kernel text,
> data and brk.
>
> Cc: linux-snps-arc@...ts.infradead.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-csky@...r.kernel.org
> Cc: uclinux-h8-devel@...ts.sourceforge.jp
> Cc: linux-m68k@...ts.linux-m68k.org
> Cc: openrisc@...ts.librecores.org
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-riscv@...ts.infradead.org
> Cc: linux-sh@...r.kernel.org
> Cc: linux-s390@...r.kernel.org
> Cc: x86@...nel.org
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>  include/linux/mm.h | 3 +++
>  mm/init-mm.c       | 9 +++++++++
>  2 files changed, 12 insertions(+)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index c274f75efcf9..02aa057540b7 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -244,6 +244,9 @@ int __add_to_page_cache_locked(struct page *page, struct address_space *mapping,
>
>  #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
>
> +void setup_initial_init_mm(void *start_code, void *end_code,
> +                          void *end_data, void *brk);
> +

Gentle query -> is there any limitation to add inline functions in
setup_arch() functions ?

>  /*
>   * Linux kernel virtual memory manager primitives.
>   * The idea being to have a "virtual" mm in the same way
> diff --git a/mm/init-mm.c b/mm/init-mm.c
> index 153162669f80..b4a6f38fb51d 100644
> --- a/mm/init-mm.c
> +++ b/mm/init-mm.c
> @@ -40,3 +40,12 @@ struct mm_struct init_mm = {
>         .cpu_bitmap     = CPU_BITS_NONE,
>         INIT_MM_CONTEXT(init_mm)
>  };
> +
> +void setup_initial_init_mm(void *start_code, void *end_code,
> +                          void *end_data, void *brk)
> +{
> +       init_mm.start_code = (unsigned long)start_code;
> +       init_mm.end_code = (unsigned long)end_code;
> +       init_mm.end_data = (unsigned long)end_data;
> +       init_mm.brk = (unsigned long)brk;
> +}
> --
> 2.26.2
>
>