linux-kernel - Re: [PATCH] mm: remove kern_addr

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Message-ID: <CAMuHMdWwAgPkifAkah7MoBKBoyB4tb+HM5cgvenwNFaAfbg+UQ@mail.gmail.com>
Date:   Tue, 18 Oct 2022 09:30:42 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
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        Peter Zijlstra <peterz@...radead.org>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>
Subject: Re: [PATCH] mm: remove kern_addr_valid() completely

On Tue, Oct 18, 2022 at 9:25 AM Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
> Most architectures(except arm64/x86/sparc) simply return 1 for
> kern_addr_valid(), which is only used in read_kcore(), and it
> calls copy_from_kernel_nofault() which could check whether the
> address is a valid kernel address, so no need kern_addr_valid(),
> let's remove unneeded kern_addr_valid() completely.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>

>  arch/m68k/include/asm/pgtable_mm.h        |  2 -
>  arch/m68k/include/asm/pgtable_no.h        |  1 -

Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org> [m68k]

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds