netdev - Re: [patch net-next v2 1/2] rocker: introduce be put/get variants and use it when appropriate

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Message-ID: <20141205102547.GH1866@nanopsycho.orion>
Date:	Fri, 5 Dec 2014 11:25:47 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	'Scott Feldman' <sfeldma@...il.com>,
	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [patch net-next v2 1/2] rocker: introduce be put/get variants
 and use it when appropriate

Fri, Dec 05, 2014 at 10:57:43AM CET, David.Laight@...LAB.COM wrote:
>From: Scott Feldman
>> Signed-off-by: Scott Feldman <sfeldma@...il.com>
>> 
>> On Wed, Dec 3, 2014 at 5:14 AM, Jiri Pirko <jiri@...nulli.us> wrote:
>> > This kills the sparse warnings.
>> >
>> > Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>> > ---
>> > v1->v2:
>> > -no change
>> > ---
>> >  drivers/net/ethernet/rocker/rocker.c | 79 ++++++++++++++++++++++--------------
>> >  1 file changed, 48 insertions(+), 31 deletions(-)
>> >
>> > diff --git a/drivers/net/ethernet/rocker/rocker.c b/drivers/net/ethernet/rocker/rocker.c
>> > index fded127..4b060fb 100644
>> > --- a/drivers/net/ethernet/rocker/rocker.c
>> > +++ b/drivers/net/ethernet/rocker/rocker.c
>> > @@ -648,6 +648,11 @@ static u16 rocker_tlv_get_u16(const struct rocker_tlv *tlv)
>> >         return *(u16 *) rocker_tlv_data(tlv);
>> >  }
>> >
>> > +static __be16 rocker_tlv_get_be16(const struct rocker_tlv *tlv)
>> > +{
>> > +       return *(__be16 *) rocker_tlv_data(tlv);
>> > +}
>
>*(int_type *)foo always rings alarm bells.....
>
>That looks dubious on systems where misaligned transfers fault.


This is common use:

for example nla_get_be16

but when you grep kernel, you see many more.

Also, rocker has all accesses like these aligned.

>
>	David
>
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