linux-kernel - Re: [RFC] dynamic_debug: introduce debug_hex

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Message-ID: <1353249531.15959.10.camel@joe-AO722>
Date:	Sun, 18 Nov 2012 06:38:51 -0800
From:	Joe Perches <joe@...ches.com>
To:	Vladimir Kondratiev <vkondrat@....qualcomm.com>
Cc:	"John W . Linville" <linville@...driver.com>,
	Johannes Berg <johannes@...solutions.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-wireless@...r.kernel.org,
	"Luis R . Rodriguez" <rodrigue@....qualcomm.com>,
	Jason Baron <jbaron@...hat.com>,
	Jim Cromie <jim.cromie@...il.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] dynamic_debug: introduce debug_hex_dump()

On Sun, 2012-11-18 at 11:47 +0200, Vladimir Kondratiev wrote:
> I see 2 drivers that use dynamic prefix:
> 
> - mentioned above drivers/tty/ipwireless/hardware.c
> - drivers/isdn/hardware/mISDN/
> 
> I see several options:
> 
> 1) require prefix_str to be constant. Patch code mentioned. For example,
> code above may reads:
> 
> static void dump_data_bytes(const char *type, const unsigned char *data,
> 			    unsigned length)
> {
> 	pr_debug(IPWIRELESS_PCCARD_NAME ": %s %s\n",
> 			type, data_type(data, length));
> 	print_hex_dump_bytes(IPWIRELESS_PCCARD_NAME, 0, (void *)data,
> 			length < DUMP_MAX_BYTES ? length : DUMP_MAX_BYTES);
> }
> 
> 2) introduce fixed format string in DEFINE_DYNAMIC_DEBUG_METADATA, like
> 
> DEFINE_DYNAMIC_DEBUG_METADATA((descriptor, "hexdump");
> 
> 3) remove print_hex_dump_bytes from this patch
> 
> I think 1) is the best, opinions?

Another option could be testing __builtin_constant_p(prefix)


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