linux-kernel - Re: [PATCH v1] csky: use free_initmem_default() in free

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Date:   Wed, 27 Jan 2021 15:52:25 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     David Hildenbrand <david@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>, linux-csky@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...nel.org>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>
Subject: Re: [PATCH v1] csky: use free_initmem_default() in free_initmem()

Thx Mike,

It's under test:
https://gitlab.com/c-sky/buildroot/-/pipelines/247353584

kernel:
https://github.com/c-sky/csky-linux/commit/9d986b01feb991ded3fb8c1f8153a0c80ea84b9c

On Wed, Jan 27, 2021 at 2:26 AM Mike Rapoport <rppt@...nel.org> wrote:
>
> On Tue, Jan 26, 2021 at 07:14:20PM +0100, David Hildenbrand wrote:
> > The existing code is essentially
> > free_initmem_default()->free_reserved_area() without poisoning.
> >
> > Note that existing code missed to update the managed page count of the
> > zone.
> >
> > Cc: Andrew Morton <akpm@...ux-foundation.org>
> > Cc: Guo Ren <guoren@...nel.org>
> > Cc: Mike Rapoport <rppt@...nel.org>
> > Cc: Oscar Salvador <osalvador@...e.de>
> > Cc: Michal Hocko <mhocko@...nel.org>
> > Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
> > Signed-off-by: David Hildenbrand <david@...hat.com>
> > ---
> >
> > Not compile tested as documentation on how to get
> >       https://gitlab.com/c-sky/buildroot
> > running, especially with a custom kernel, is a bit sparse.
>
> You can pick a cross-compiler from here:
>
> https://mirrors.edge.kernel.org/pub/tools/crosstool/
>
> > ---
> >  arch/csky/mm/init.c | 17 +----------------
> >  1 file changed, 1 insertion(+), 16 deletions(-)
> >
> > diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c
> > index 81e4e5e78f38..894050a8ce09 100644
> > --- a/arch/csky/mm/init.c
> > +++ b/arch/csky/mm/init.c
> > @@ -110,24 +110,9 @@ void __init mem_init(void)
> >       mem_init_print_info(NULL);
> >  }
> >
> > -extern char __init_begin[], __init_end[];
> > -
> >  void free_initmem(void)
> >  {
> > -     unsigned long addr;
> > -
> > -     addr = (unsigned long) &__init_begin;
> > -
> > -     while (addr < (unsigned long) &__init_end) {
> > -             ClearPageReserved(virt_to_page(addr));
> > -             init_page_count(virt_to_page(addr));
> > -             free_page(addr);
> > -             totalram_pages_inc();
> > -             addr += PAGE_SIZE;
> > -     }
> > -
> > -     pr_info("Freeing unused kernel memory: %dk freed\n",
> > -     ((unsigned int)&__init_end - (unsigned int)&__init_begin) >> 10);
> > +     free_initmem_default(-1);
> >  }
> >
> >  void pgd_init(unsigned long *p)
> > --
> > 2.29.2
> >
>
> --
> Sincerely yours,
> Mike.



-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/