linux-kernel - Re: [PATCH] lib/vsprintf.c: add %paD format specifier for dma_addr

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Date:	Fri, 29 Nov 2013 14:10:40 -0800
From:	Joe Perches <joe@...ches.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Rob Landley <rob@...dley.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	dmaengine@...r.kernel.org, Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] lib/vsprintf.c: add %paD format specifier for
 dma_addr_t types

On Fri, 2013-11-29 at 14:56 +0200, Andy Shevchenko wrote:
> On Thu, 2013-11-28 at 10:32 -0800, Joe Perches wrote:
> > On Thu, 2013-11-28 at 13:28 +0200, user.email wrote:
> > > From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > > 
> > > Add the %paD format specifier for printing a dma_addr_t type, since the
> > > DMA address size on some platforms can vary based on build options,
> > > regardless of the native integer type.
> > 
> > OK, but I prefer this one because upper case is
> > sometimes used to specify upper case only output.
> > ala %x %X and %pUl %pUL.
> 
> No objections.
> 
> > https://lkml.org/lkml/2013/9/12/483
> 
> Hmm... Still not in kernel. Do you know reason why it so?

It was just for discussion and I didn't sign or push it
to anyone else.

What's slightly funny is how far back dma_addr_t printk
discussions go.

http://lkml.indiana.edu/hypermail/linux/kernel/0202.1/1221.html

Anyway, if you think you're going to do a lot of
transforms of printk("%x", dma_addr_t) with or without
(unsigned long long) or (u64) casts, I'll submit a signed
patch to Andrew.

Let me know.

In an aside for Julia Lawall (added to cc's), I tried to
do a spatch grep for dma_addr_t (and phys_addr_t) types
that were cast to (unsigned long) or (u64) but I was
unsuccessful.  Is there something else I need to do?

$ cat dma_addr_t.cocci
@@
dma_addr_t foo;
@@

* (unsigned long long)foo;

$ cat t.c
#include <linux/types.h>
#include <linux/printk.h>

int foo(dma_addr_t a)
{
	printk("test: %llx\n", (unsigned long long)a);
}

$ spatch --all-includes --local-includes  -I include/ --sp-file dma_addr_t.cocci t.c
init_defs_builtins: /usr/local/share/coccinelle/standard.h
HANDLING: t.c
$ 

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