linux-kernel - Re: [PATCH] x86, ioremap: use %pR in printk

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Message-ID: <20081020090502.GB31710@elte.hu>
Date:	Mon, 20 Oct 2008 11:05:02 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Linus Torvalds <torvalds@...l.org>, linux-kernel@...r.kernel.org,
	David Miller <davem@...emloft.net>, linux-pci@...r.kernel.org,
	yhlu.kernel@...il.com, Andrew Morton <akpm@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] x86, ioremap: use %pR in printk


* Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:

> On Mon, 2008-10-20 at 09:12 +0200, Ingo Molnar wrote:
> > * Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
> > 
> > > This converts things in drivers/pci to use %pR to printout the
> > > content of a struct resource instead of hand-casted %llx or
> > > other variants.
> > > 
> > > Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> > 
> > cool!
> > 
> >  Acked-by: Ingo Molnar <mingo@...e.hu>
> > 
> > there's also two places in arch/x86/mm/ioremap.c that could use this 
> > straight away - see the (untested) patch below.
> 
> No, you don't pass it a phys_addr_t or a resource_size_t, you pass it a
> struct resource *

oops ... i only looked at:

+       char sym[4*sizeof(resource_size_t) + 8];

and assumed that it was a resource_size_t printout format :-/

while printing out ranges is useful too, it's by far not the only source 
of ugliness all around resource_size_t.

> Now, I would have liked to have a way to print a resource_size_t (or 
> phys_addr_t) but that's harder because we need pointers for the magic 
> typechecking to work (among others).
> 
> Maybe we could create a special format for a 
> pointer-to-resource_size_t and pass &foo on callers but that's 
> fishy...

would be very nice to just have support for all the native types that 
the kernel uses. %pR is still a convenient shortcut.

	Ingo
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