linux-kernel - Re: [PATCH] dvb-usb: unaligned

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Message-Id: <1211331203.5915.244.camel@brick>
Date:	Tue, 20 May 2008 17:53:23 -0700
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Al Viro <viro@....linux.org.uk>, mchehab@...radead.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH] dvb-usb: unaligned

On Wed, 2008-05-21 at 01:47 +0100, Al Viro wrote:
> On Tue, May 20, 2008 at 05:42:46PM -0700, Harvey Harrison wrote:
> > On Wed, 2008-05-21 at 01:33 +0100, Al Viro wrote:
> > > Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> > > ---
> > >  drivers/media/dvb/dvb-usb/dvb-usb-firmware.c |    2 +-
> > >  1 files changed, 1 insertions(+), 1 deletions(-)
> > > 
> > > diff --git a/drivers/media/dvb/dvb-usb/dvb-usb-firmware.c b/drivers/media/dvb/dvb-usb/dvb-usb-firmware.c
> > > index e1112e3..733a7ff 100644
> > > --- a/drivers/media/dvb/dvb-usb/dvb-usb-firmware.c
> > > +++ b/drivers/media/dvb/dvb-usb/dvb-usb-firmware.c
> > > @@ -127,7 +127,7 @@ int dvb_usb_get_hexline(const struct firmware *fw, struct hexline *hx,
> > >  	if ((*pos + hx->len + 4) >= fw->size)
> > >  		return -EINVAL;
> > >  
> > > -	hx->addr = le16_to_cpu( *((u16 *) &b[1]) );
> > > +	hx->addr = b[1] | (b[2] << 8);
> > 
> > ???hx->addr = get_unaligned_le16(&b[1]);
> 
> Again, what's the benefit?  Having a function doesn't mean that we need
> to use it religiously - if it doesn't make things more clear...

Just curious, is gcc smart enough to just turn this into a 2-byte load
on x86 (little-endian with no particular alignment constraints).
Otherwise it would have a better chance at doing this using the helper
function.

You're right though, it is a small consideration.

Harvey



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