linux-kernel - Re: [RFC-PATCH] lib: add byteorder helpers for the aligned case

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Message-Id: <1210984676.5915.70.camel@brick>
Date:	Fri, 16 May 2008 17:37:56 -0700
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Bryan Wu <cooloney@...nel.org>, Jie Zhang <jie.zhang@...log.com>,
	Oliver Neukum <oliver@...kum.org>, david-b@...bell.net,
	greg@...ah.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC-PATCH] lib: add byteorder helpers for the aligned case

On Fri, 2008-05-16 at 20:35 -0400, Alan Stern wrote:
> On Fri, 16 May 2008, Harvey Harrison wrote:
> 
> > +static inline void put_le16(u16 val, void *ptr)
> > +{
> > +	*(__le16 *)ptr = cpu_to_le16(val);
> > +}
> 
> Is this able to do the byte rearrangement at compile time if val is a 
> compile-time constant?  I imagine it would.
> 

Yes, the cpu_to_le/be functions to get optimized if they are passed a
compile time constant.


Harvey

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