linux-kernel - Re: [PATCH 14/22] parisc: %pF is only for function pointers

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Message-ID: <1426183481.2146.80.camel@HansenPartnership.com>
Date:	Thu, 12 Mar 2015 14:04:41 -0400
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Scott Wood <scottwood@...escale.com>
Cc:	trivial@...nel.org, linux-kernel@...r.kernel.org,
	linux-parisc@...r.kernel.org
Subject: Re: [PATCH 14/22] parisc: %pF is only for function pointers

On Thu, 2015-03-12 at 11:14 -0500, Scott Wood wrote:
> On Thu, 2015-03-12 at 08:11 -0400, James Bottomley wrote:
> > On Wed, 2015-03-11 at 22:13 -0500, Scott Wood wrote:
> > > Use %pS for actual addresses, otherwise you'll get bad output
> > > on arches like ppc64 where %pF expects a function descriptor.  Even on
> > > other architectures, refrain from setting a bad example that people
> > > copy.
> > 
> > Are you sure about this?  Parisc64 is a function description
> > architecture.  There may be a misunderstanding about what
> > __builtin_return_address(0) is supposed to return, but I'm certain the
> > person who added the code thought it returned a function pointer, which
> > on parisc64 would be a descriptor.
> 
> I wasn't aware that parisc64 used descriptors, but I don't see how you'd
> get one out of __builtin_return_address(0) since it's not usually a
> function entry point (plus, GCC documents it as returning void *).

I was more thinking that this message is printed for every boot with a
superio chip (which is a lot of our boxes).  How come no-one has
complained on parisc64 if it's doing the wrong thing.

James


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