linux-kernel - Re: [PATCH 18/22] usb: gadget: serial: %pF is only for function pointers

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Message-ID: <1426178623.30327.120.camel@freescale.com>
Date:	Thu, 12 Mar 2015 11:43:43 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC:	<trivial@...nel.org>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, Felipe Balbi <balbi@...com>
Subject: Re: [PATCH 18/22] usb: gadget: serial: %pF is only for function
 pointers

On Thu, 2015-03-12 at 15:36 +0300, Sergei Shtylyov wrote:
> Hello.
> 
> On 3/12/2015 6:13 AM, Scott Wood wrote:
> 
> > Use %pS for actual addresses, otherwise you'll get bad output
> 
>     %pS or %ps?
> 
> > on arches like ppc64 where %pF expects a function descriptor.
> 
>     %pF or %pf? And what is a function descriptor?

%pS where %pF appeared, and %ps where %pf appeared (yes, I'll fix the
copy-and-paste commit message).  A function descriptor is a data
structure used when a function pointer needs to contain more information
than the instruction pointer to branch to, such as a TOC pointer.
Example:
http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html#FUNC-DES

-Scott


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