netdev - Re: [PATCH iproute2] ss: better 32bit support

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Date:	Sat, 14 Mar 2015 18:51:31 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Stephen Hemminger <shemming@...cade.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH iproute2] ss: better 32bit support

On Sat, 2015-03-14 at 19:19 +0000, Ben Hutchings wrote:
> On Tue, 2015-03-10 at 09:56 -0700, Eric Dumazet wrote:
> > From: Eric Dumazet <edumazet@...gle.com>


> > -static unsigned long cookie_sk_get(uint32_t *cookie)
> > +static unsigned long long cookie_sk_get(const uint32_t *cookie)
> >  {
> > -	return (((unsigned long)cookie[1] << 31) << 1) | cookie[0];
> > +	return (((unsigned long long)cookie[1] << 31) << 1) | cookie[0];
> 
> Then you should also use << 32 instead of splitting it into two shifts.

Yep, why not, although compiler does not care : no shift at all is
generated anyway.

Since kernel code no longer uses this << 31 trick, we can align ss code.


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