linux-kernel - RE: [PATCH 00/14] Fix wrong %pF and %pS printk format specifier usages

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Date:   Thu, 7 Sep 2017 16:05:43 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Helge Deller <deller@....de>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Sergey Senozhatsky" <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: RE: [PATCH 00/14] Fix wrong %pF and %pS printk format specifier
 usages

>> 	if (not_a_function_descriptor(ptr))
>> 		return ptr;
>
> I'm not sure if it's possible on ia64/ppc64/parisc64
> to reliably detect if it's a function descriptor or not.

Agreed. I don't know how to write this test (without changing the compiler to
put the pointers in a separate section ... and then changing the module loader
to keep a list of all these sections).

-Tony