linux-kernel - Re: [PATCH 1/3] arm64: mmu: update paging

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Message-ID: <20190213111841.GA22119@lakrids.cambridge.arm.com>
Date:   Wed, 13 Feb 2019 11:18:42 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Peng Fan <peng.fan@....com>
Cc:     "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
        "yaojun8558363@...il.com" <yaojun8558363@...il.com>,
        "cpandya@...eaurora.org" <cpandya@...eaurora.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "van.freenix@...il.com" <van.freenix@...il.com>
Subject: Re: [PATCH 1/3] arm64: mmu: update paging_init comments

On Wed, Feb 13, 2019 at 09:37:24AM +0000, Peng Fan wrote:
> The comments has not been changed since the function introduced, but the
> function has been changed dramatically, so update the comments to
> reflect the code.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  arch/arm64/mm/mmu.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> index d6b6f1b169bb..065202da3ad2 100644
> --- a/arch/arm64/mm/mmu.c
> +++ b/arch/arm64/mm/mmu.c
> @@ -655,8 +655,8 @@ static void __init map_kernel(pgd_t *pgdp)
>  }
>  
>  /*
> - * paging_init() sets up the page tables, initialises the zone memory
> - * maps and sets up the zero page.
> + * paging_init() sets up the page tables, switch ttbr1 from init_pg_dir
> + * to swapper_pg_dir, free init_pg_dir memblock and permit memblock resizing.
>   */

I think that it would be better to remove the comment entirely. This
doesn't explain the intent, or rationale, and all this information is
obvious from a straight-line reading of the code.

If you remove the comment instead:

Acked-by: Mark Rutland <mark.rutland@....com>

Mark.

>  void __init paging_init(void)
>  {
> -- 
> 2.16.4
>