linux-kernel - Re: [PATCH v8 01/16] hashtable: introduce a small and naive hashtable

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Message-ID: <1351646186.4004.41.camel@gandalf.local.home>
Date:	Tue, 30 Oct 2012 21:16:26 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	Tejun Heo <tj@...nel.org>, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, paul.gortmaker@...driver.com,
	davem@...emloft.net, mingo@...e.hu, ebiederm@...ssion.com,
	aarcange@...hat.com, ericvh@...il.com, netdev@...r.kernel.org,
	josh@...htriplett.org, eric.dumazet@...il.com,
	mathieu.desnoyers@...icios.com, axboe@...nel.dk, agk@...hat.com,
	dm-devel@...hat.com, neilb@...e.de, ccaulfie@...hat.com,
	teigland@...hat.com, Trond.Myklebust@...app.com,
	bfields@...ldses.org, fweisbec@...il.com, jesse@...ira.com,
	venkat.x.venkatsubra@...cle.com, ejt@...hat.com,
	snitzer@...hat.com, edumazet@...gle.com, linux-nfs@...r.kernel.org,
	dev@...nvswitch.org, rds-devel@....oracle.com, lw@...fujitsu.com
Subject: Re: [PATCH v8 01/16] hashtable: introduce a small and naive
 hashtable

On Tue, 2012-10-30 at 20:33 -0400, Sasha Levin wrote:
> On Tue, Oct 30, 2012 at 5:42 PM, Tejun Heo <tj@...nel.org> wrote:
> > Hello,
> >
> > Just some nitpicks.
> >
> > On Tue, Oct 30, 2012 at 02:45:57PM -0400, Sasha Levin wrote:
> >> +/* Use hash_32 when possible to allow for fast 32bit hashing in 64bit kernels. */
> >> +#define hash_min(val, bits)                                                  \
> >> +({                                                                           \
> >> +     sizeof(val) <= 4 ?                                                      \
> >> +     hash_32(val, bits) :                                                    \
> >> +     hash_long(val, bits);                                                   \
> >> +})
> >
> > Doesn't the above fit in 80 column.  Why is it broken into multiple
> > lines?  Also, you probably want () around at least @val.  In general,
> > it's a good idea to add () around any macro argument to avoid nasty
> > surprises.
> 
> It was broken to multiple lines because it looks nicer that way (IMO).
> 
> If we wrap it with () it's going to go over 80, so it's going to stay
> broken down either way :)

({								      \
	sizeof(val) <= 4 ? hash_32(val, bits) : hash_long(val, bits); \
})

Is the better way to go. We are C programmers, we like to see the ?: on
a single line if possible. The way you have it, looks like three
statements run consecutively.

-- Steve


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