linux-kernel - Re: [PATCH 2/2] i2c: Add message transfer tracepoints for SMBUS

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Message-ID: <11165.1393507178@warthog.procyon.org.uk>
Date:	Thu, 27 Feb 2014 13:19:38 +0000
From:	David Howells <dhowells@...hat.com>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	dhowells@...hat.com, wolfram@...-dreams.de, khali@...ux-fr.org,
	linux-i2c@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] i2c: Add message transfer tracepoints for SMBUS

Wolfram Sang <wsa@...-dreams.de> wrote:

> Although SMBus has no 10-bit addresses, we probably should also use %03x
> there for consistency reasons?

Done.

> Also, the I2C tracing has first 'f' then 'a', that should be consistent,
> too.

Flags first or address first?  Do you have a preference (for both)?

> 'flags' should be %04x again

Done.

> and I'd prefer %*ph (or %*phD) for the buffer.

Again, I'm not so certain.

> Can we have something like this for 'flags'?

There's a __print_flags() which should work.  One thing I'm concerned about
there is how do we handle more flags being added - does that count as an ABI
break if the printed format changes?

SMBus flags are basically the same as I2C flags, right?

David
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