linux-kernel - Re: [PATCH] i2c: Add message transfer tracepoints for I2C and SMBUS

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Date:	Fri, 13 Dec 2013 17:04:14 +0000
From:	David Howells <dhowells@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	dhowells@...hat.com, Jean Delvare <khali@...ux-fr.org>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	Wolfram Sang <wolfram@...-dreams.de>
Subject: Re: [PATCH] i2c: Add message transfer tracepoints for I2C and SMBUS

Steven Rostedt <rostedt@...dmis.org> wrote:

> > Would it be possible to print this as a string rather than a number?
> > The protocol numbers are completely arbitrary, so the reader would have
> > to open i2c.h each time to figure out what is what.
> 
> That can be done in the TP_printk() with:
> 
> 	".. %s ..", ..,
> 	__print_symbolic(__entry->protocol,
> 		{ I2C_SMBUS_QUICK	,	"QUICK"	},
> 		{ I2C_SMBUS_BYTE	,	"BYTE"	},
> 		{ I2C_SMBUS_BYTE_DATA	,	"BYTE_DATA" },
> 		[...]
> 		{ I2C_SMBUS_I2C_BLOCK_DATA,	"I2C_BLOCK_DATA"}), ...

What happens if the number isn't in the table?

David
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