linux-kernel - Re: [linux-pm] [RFC] PM_QOS api update to use handles 1/5

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Date:	Thu, 7 Jan 2010 12:55:58 -0800
From:	mark gross <mgross@...ux.intel.com>
To:	Pavel Machek <pavel@....cz>
Cc:	640E9920 <640e9920@...il.com>, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] [RFC] PM_QOS api update to use handles 1/5

On Wed, Jan 06, 2010 at 08:18:31PM +0100, Pavel Machek wrote:
> Hi!
> 
> > > Umm.. passing binary numbers like that... is not exactly good
> > > interface. Think endianness issues  when writing to it from high-level
> > > language.
> > 
> > yeah.  At the moment I can't recall why I went binary for the ABI, 
> > we can revisit this, but its been in the wild for a few years now :(
> > 
> > I guess I can do some tricks to see if its a hex string representation
> > of a number and parse that as well as supporting the s32.  i.e. accept
> > strings "0x0000000" ... "0xFFFFFFFF" and return -EINVAL for anything
> > else.
> 
> Maybe you could use length for detection? If they are writing 4 bytes,
> it is s32, 10 bytes means ascii?

That is what I was thinking + making sure the chars in the string where
valid hex digits ;)  It would be easy to do.  Let me know if you think I
should attempt to roll that into the kernel ABI exposed by this thing.

--mgross


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