linux-kernel - Re: [PATCH 02/10] crypto: omap-aes: Add useful debug macros

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Date:	Wed, 14 Aug 2013 17:47:16 -0700
From:	Joe Perches <joe@...ches.com>
To:	Joel Fernandes <joelf@...com>
Cc:	Herbert Xu <herbert@...dor.hengli.com.au>,
	"David S. Miller" <davem@...emloft.net>,
	Mark Greer <mgreer@...malcreek.com>,
	Tony Lindgren <tony@...mide.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Rajendra Nayak <rnayak@...com>,
	Lokesh Vutla <lokeshvutla@...com>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH 02/10] crypto: omap-aes: Add useful debug macros

On Wed, 2013-08-14 at 18:40 -0500, Joel Fernandes wrote:
> On 08/14/2013 06:29 PM, Joe Perches wrote:
> > On Wed, 2013-08-14 at 18:12 -0500, Joel Fernandes wrote:
> >> When DEBUG is enabled, these macros can be used to print variables
> >> in integer and hex format, and clearly display which registers,
> >> offsets and values are being read/written , including printing the
> >> names of the offsets and their values.
> > []
> >> diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
> > []
> >> @@ -15,6 +15,14 @@
> >>  
> >>  #define pr_fmt(fmt) "%s: " fmt, __func__
> >>  
> >> +#ifdef DEBUG
> >> +#define prn(num) printk(#num "=%d\n", num)
> >> +#define prx(num) printk(#num "=%x\n", num)
> > 
> > pr_debug?
> 
> Sure, can change that.
> 
> >> +#else
> >> +#define prn(num) do { } while (0)
> >> +#define prx(num)  do { } while (0)
> >> +#endif
> > []
> >> @@ -172,13 +180,35 @@ struct omap_aes_dev {
> >>  static LIST_HEAD(dev_list);
> >>  static DEFINE_SPINLOCK(list_lock);
> >>  
> >> +#ifdef DEBUG
> >> +#define omap_aes_read(dd, offset)					\
> >> +	do {								\
> >> +		omap_aes_read_1(dd, offset);				\
> >> +		pr_debug("omap_aes_read(" #offset ")\n");		\
> >> +	} while (0)
> >> +
> >> +static inline u32 omap_aes_read_1(struct omap_aes_dev *dd, u32 offset)
> >> +#else
> >>  static inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
> >> +#endif
> >>  {
> >>  	return __raw_readl(dd->io_base + offset);
> >>  }
> >>  
> >> +#ifdef DEBUG
> >> +#define omap_aes_write(dd, offset, value)				\
> >> +	do {								\
> >> +		pr_debug("omap_aes_write(" #offset "=%x) value=%d\n",	\
> >> +			 offset, value);				\
> >> +		omap_aes_write_1(dd, offset, value);			\
> >> +	} while (0)
> >> +
> >> +static inline void omap_aes_write_1(struct omap_aes_dev *dd, u32 offset,
> >> +				  u32 value)
> >> +#else
> >>  static inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
> >>  				  u32 value)
> >> +#endif
> >>  {
> >>  	__raw_writel(value, dd->io_base + offset);
> >>  }
> > 
> > Umm, yuck?
> > 
> > Is there any real value in read_1 and write_1?
> 
> Can you be more descriptive? There is a lot of value in them for debug
> to show clearly sequence of read/writes. Moreover, they are no-op'd when
> DEBUG is disabled.

pr_debug is no-op'd when DEBUG is not #defined.
so just use a single

omap_aes_write(...)
{
	pr_debug(...)
	__raw_writel(...);
}


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