linux-ext4 - Re: [PATCH 14/14] crc32: Select an algorithm via kconfig

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Message-ID: <20111203023646.GB16577@tux1.beaverton.ibm.com>
Date:	Fri, 2 Dec 2011 18:36:46 -0800
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>,
	Bob Pearson <rpearson@...temfabricworks.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-crypto <linux-crypto@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Mingming Cao <cmm@...ibm.com>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 14/14] crc32: Select an algorithm via kconfig

On Fri, Dec 02, 2011 at 08:25:05AM +0800, Herbert Xu wrote:
> On Thu, Dec 01, 2011 at 12:15:17PM -0800, Darrick J. Wong wrote:
> > Allow the kernel builder to choose a crc32* algorithm for the kernel.
> > 
> > Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
> 
> I don't like this at all.  How do you expect distros or indeed
> anyone to make this choice? For generic C implementations like
> this we should only have one, and not many.

Slice-by-8 should be picked automatically if the builder doesn't explicitly
pick another one.  The other choices are provided for people who want a slimmer
cache footprint.  I guess I could make the Kconfig file a bit more explicit
about slice-by-8 being default, or I guess we could just ignore this one patch
and thereby keeping us with the old method where anyone who wants the slimmer
implementations patches the #defines.

--D
> 
> Cheers,
> -- 
> Email: Herbert Xu <herbert@...dor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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