netdev - Re: [PATCH 1/1] compat-wireless: Fix ath9k debug log issue.

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Date:	Tue, 1 Feb 2011 19:03:01 +0530
From:	Senthil Balasubramanian <senthilkumar@...eros.com>
To:	Joe Perches <joe@...ches.com>
CC:	Senthilkumar Balasubramanian 
	<Senthilkumar.Balasubramanian@...eros.com>,
	Luis Rodriguez <Luis.Rodriguez@...eros.com>,
	"mcgrof@...il.com" <mcgrof@...il.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/1] compat-wireless: Fix ath9k debug log issue.

On Tue, Feb 01, 2011 at 12:28:16AM +0530, Joe Perches wrote:
> On Mon, 2011-01-31 at 17:07 +0530, Senthil Balasubramanian wrote:
> > ath9k debug logs are not shown as we are using recursive vsnprintf
> > which are supported in kernel 2.6.36 and above. use vprintk for older
> > kernels.
> 
> #ifdefs spread around the tree for this sort of
> change are not very nice.
#if LINUX_VERSION is unavoidable in compat wireless and compat is actually
meant for that.
> 
> Perhaps wireless-compat should not be an impediment to
> mainline progress and these sorts of changes should be
> minimized.
>  
> If this is really necessary for backward compatibility,
> I think the %pV could just be removed.
May be this can be done if we are really worried about the no.of patches
in compat folder.
> 
> If not, because this style would be used in several
> places, perhaps another macro could be used to hide the
> use of %pV.
> 
> Maybe something like:
you mean use this in wireless-testing ??. We should not
add if kernel version checks in wireless-testing code and
I don't prefer that either.

> 
> #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36))
> #define PRINTK_VA_LIST(level, prefix, fmt, __va_list)	\
> ({							\
>  	struct va_format vaf;				\
>  							\
>  	vaf.fmt = fmt;					\
>  	vaf.va = &__va_list;				\
> 							\
> 	printk("%s" prefix "%pV", level, &vaf);		\
> })
> #else
> #define PRINTK_VA_LIST(level, prefix, fmt, __va_list)	\
> ({							\
> 	printk("%s" prefix, level);			\
> 	vprintk(fmt, __va_list);			\
> })
> #endif
> 
> > +diff --git a/drivers/net/wireless/ath/main.c b/drivers/net/wireless/ath/main.c
> > +index c325202..e3e60d4 100644
> > +--- a/drivers/net/wireless/ath/main.c
> > ++++ b/drivers/net/wireless/ath/main.c
> > +@@ -60,16 +60,23 @@ EXPORT_SYMBOL(ath_rxbuf_alloc);
> > + int ath_printk(const char *level, struct ath_common *common,
> > + 	       const char *fmt, ...)
> > + {
> > ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36))
> > + 	struct va_format vaf;
> > ++#endif
> > + 	va_list args;
> > + 	int rtn;
> > + 
> > + 	va_start(args, fmt);
> > + 
> > ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36))
> > + 	vaf.fmt = fmt;
> > + 	vaf.va = &args;
> > + 
> > + 	rtn = printk("%sath: %pV", level, &vaf);
> > ++#else
> > ++	printk("%sath: ", level);
> > ++	rtn = vprintk(fmt, args);
> > ++#endif
> > + 
> > + 	va_end(args);
> > + 
> 
> So this would become something like:
> 
> int ath_printk(const char *level, struct ath_common *common,
> 	       const char *fmt, ...)
> {
> 	va_list args;
> 	int rtn;
> 
> 	va_start(args, fmt);
> 
> 	rtn = PRINTK_VA_LIST(level, "ath: ", fmt, args);
> 
> 	va_end(args);
> 
> 	return rtn;
> }
> 
> 
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