netdev - Re: [PATCH V11 4/5] vsprintf: add printk specifier %px

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Message-ID: <CAMuHMdUebiN16BA6qLO+Wv2LetdYgbmd8E_e74hQj52yEUwPOQ@mail.gmail.com>
Date:   Wed, 6 Dec 2017 09:32:14 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        David Laight <David.Laight@...lab.com>,
        Kees Cook <keescook@...omium.org>,
        "Tobin C. Harding" <me@...in.cc>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        "Theodore Ts'o" <tytso@....edu>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Tycho Andersen <tycho@...ho.ws>,
        "Roberts, William C" <william.c.roberts@...el.com>,
        Tejun Heo <tj@...nel.org>,
        Jordan Glover <Golden_Miller83@...tonmail.ch>,
        Greg KH <gregkh@...uxfoundation.org>,
        Petr Mladek <pmladek@...e.com>, Joe Perches <joe@...ches.com>,
        Ian Campbell <ijc@...lion.org.uk>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <wilal.deacon@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Chris Fries <cfries@...gle.com>,
        Dave Weinstein <olorin@...gle.com>,
        Daniel Micay <danielmicay@...il.com>,
        Djalal Harouni <tixxdz@...il.com>,
        Radim Krcmár <rkrcmar@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH V11 4/5] vsprintf: add printk specifier %px

Hi Linus,

On Wed, Dec 6, 2017 at 2:59 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Tue, Dec 5, 2017 at 5:36 PM, Sergey Senozhatsky
> <sergey.senozhatsky.work@...il.com> wrote:
>> I see some %p-s being used in _supposedly_ important output,
>> like arch/x86/mm/fault.c
>>
>> show_fault_oops(struct pt_regs *regs, unsigned long error_code,
>>                 unsigned long address)
>> ...
>>         printk(KERN_CONT " at %p\n", (void *) address);
>>         printk(KERN_ALERT "IP: %pS\n", (void *)regs->ip);
>
> So %pS isn't %p, and shows the symbolic name.

If the symbolic name is available.
Else it prints the non-hashed pointer value (FTR).

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