linux-kernel - Re: [PATCH RFC v3 1/2] mm: Add personality flag to limit address to 47 bits

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Message-ID: <CAMuHMdURgy6NPthHhfOv_h=C_gw2hEpnGQ7iBGoDE=ZazUPRHA@mail.gmail.com>
Date: Tue, 10 Sep 2024 14:43:06 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Christophe Leroy <christophe.leroy@...roup.eu>
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Subject: Re: [PATCH RFC v3 1/2] mm: Add personality flag to limit address to
 47 bits

Hi Christophe,

On Tue, Sep 10, 2024 at 11:21 AM Christophe Leroy
<christophe.leroy@...roup.eu> wrote:
> >>> diff --git a/include/uapi/linux/personality.h b/include/uapi/linux/personality.h
> >>> index 49796b7756af..cd3b8c154d9b 100644
> >>> --- a/include/uapi/linux/personality.h
> >>> +++ b/include/uapi/linux/personality.h
> >>> @@ -22,6 +22,7 @@ enum {
> >>>     WHOLE_SECONDS =         0x2000000,
> >>>     STICKY_TIMEOUTS =       0x4000000,
> >>>     ADDR_LIMIT_3GB =        0x8000000,
> >>> +   ADDR_LIMIT_47BIT =      0x10000000,
> >>>   };
> >>
> >> I wonder if ADDR_LIMIT_128T would be clearer?
> >>
> >
> > I don't follow, what does 128T represent?
>
> 128T is 128 Terabytes, that's the maximum size achievable with a 47BIT
> address, that naming would be more consistant with the ADDR_LIMIT_3GB
> just above that means a 3 Gigabytes limit.

Hence ADDR_LIMIT_128TB?

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