linux-kernel - Re: [PATCH] trace: Make trace

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Message-ID: <CAK8P3a1-Fpkg-d0k9HryqW4ULVfZPL6_McLxoFbUT6CTmMoMFg@mail.gmail.com>
Date:   Mon, 27 Mar 2017 17:35:13 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Paul Menzel <pmenzel@...gen.mpg.de>, Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH] trace: Make trace_hwlat timestamp y2038 safe

On Mon, Mar 27, 2017 at 5:30 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> On Mon, 27 Mar 2017 16:53:09 +0200
>> We could probably introduce a %pts format string for timespec64
>> and have that pretty-printed.
>
> Hmm, probably don't want a %p as that suggests its a pointer, which it
> should not be. Unless we pass in the address of the number.

The special format strings that the kernel defines all start with %p and
require passing by reference so we don't get a warning from gcc. We can't
just make up new format strings otherwise, but we can create new meaning
for special pointers as we do for struct resource and others.

       Arnd