linux-kernel - Re: [PATCH v2] mm/mm_init.c: Extend init unavailable range doc info

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Message-ID: <20231203115815.GM636165@kernel.org>
Date:   Sun, 3 Dec 2023 13:58:15 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Serge Semin <fancer.lancer@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-mips@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm/mm_init.c: Extend init unavailable range doc info

On Sat, Dec 02, 2023 at 02:18:52PM +0300, Serge Semin wrote:
> Besides of the already described reasons the pages backended memory holes
> might present due to having non-memory regions covered by the contiguous
> flatmem mapping. Add such note to the init_unavailable_range() method kdoc
> in order to point out to one more reason of having the function executed
> for such regions.
> 
> Signed-off-by: Serge Semin <fancer.lancer@...il.com>

Reviewed-by: Mike Rapoport (IBM) <rppt@...nel.org>

> 
> ---
> 
> Link: https://lore.kernel.org/linux-mips/20231122182419.30633-6-fancer.lancer@gmail.com/
> Changelog v2:
> - The holes in the memory are actually justified by having the flatmem
>   mapping model. Change the patch and the log accordingly. (@Mike)
> ---
>  mm/mm_init.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/mm_init.c b/mm/mm_init.c
> index 077bfe393b5e..824bf53e8253 100644
> --- a/mm/mm_init.c
> +++ b/mm/mm_init.c
> @@ -796,6 +796,7 @@ overlap_memmap_init(unsigned long zone, unsigned long *pfn)
>   * - physical memory bank size is not necessarily the exact multiple of the
>   *   arbitrary section size
>   * - early reserved memory may not be listed in memblock.memory
> + * - non-memory regions covered by the contigious flatmem mapping
>   * - memory layouts defined with memmap= kernel parameter may not align
>   *   nicely with memmap sections
>   *
> -- 
> 2.42.1
> 

-- 
Sincerely yours,
Mike.