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Date:   Sun, 10 May 2020 10:04:16 +0900
From:   Tetsuo Handa <>
To:     Linus Torvalds <>
Cc:     Al Viro <>,
        Linux Kernel Mailing List <>,
        linux-fsdevel <>
Subject: Re: [PATCH 05/20] tomoyo_write_control(): get rid of pointless

On 2020/05/10 9:57, Linus Torvalds wrote:
> On Sat, May 9, 2020 at 5:51 PM Tetsuo Handa
> <> wrote:
>> I think that this access_ok() check helps reducing partial writes (either
>> "whole amount was processed" or "not processed at all" unless -ENOMEM).
> No it doesn't.
> "access_ok()" only checks the range being a valid user address range.

I see. Thank you.

Acked-by: Tetsuo Handa <>

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