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Date:   Wed, 6 Dec 2017 09:48:12 +0100
From:   Geert Uytterhoeven <>
To:     Linus Torvalds <>
Cc:     "Tobin C. Harding" <>,
        "Jason A. Donenfeld" <>,
        "Theodore Ts'o" <>, Kees Cook <>,
        Paolo Bonzini <>,
        Tycho Andersen <>,
        "Roberts, William C" <>,
        Tejun Heo <>,
        Jordan Glover <>,
        Greg KH <>,
        Petr Mladek <>, Joe Perches <>,
        Ian Campbell <>,
        Sergey Senozhatsky <>,
        Catalin Marinas <>,
        Will Deacon <>,
        Steven Rostedt <>,
        Chris Fries <>,
        Dave Weinstein <>,
        Daniel Micay <>,
        Djalal Harouni <>,
        Radim Krčmář <>,
        "" <>,
        Network Development <>,
        David Miller <>,
        Stephen Rothwell <>,
        Andrey Ryabinin <>,
        Alexander Potapenko <>,
        Dmitry Vyukov <>,
        Andrew Morton <>,
        Sergei Shtylyov <>
Subject: Re: [PATCH V11 3/5] printk: hash addresses printed with %p

Hi Linus,

On Wed, Dec 6, 2017 at 12:33 AM, Linus Torvalds
<> wrote:
> On Tue, Dec 5, 2017 at 2:57 PM, Geert Uytterhoeven <> wrote:
>> Lowest 3 is good enough for all natural types, up to long long.
>> We may still receive complaints from people who care about seeing if
>> a pointer is cacheline-aligned or not. Fixing that may need up to 7 bits, I'm
>> afraid, which is a bit too much to give up.
> I really think even the lowest three is a bit too much.
> Who really cares? If it's something that is particularly _about_
> alignment (ie an alignment trap), maybe just print out those bits
> separately.

If I'm not mistaken, some architectures don't generate alignment traps, but
just zero the LSBs.

> And for everything else? It's purely about getting used to it.

Yes, we will get used to it.

I agree that for debugging during development, we will just use %px and be

Storm in a glass of water, everybody will have forgotten by the time v4.16 is



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

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

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