linux-kernel - RE: [PATCH 09/17] Tools: hv: Represent the ipv6 mask using CIDR notation

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Message-ID: <426367E2313C2449837CD2DE46E7EAF9236A7733@SN2PRD0310MB382.namprd03.prod.outlook.com>
Date:	Tue, 24 Jul 2012 16:53:50 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"ben@...adent.org.uk" <ben@...adent.org.uk>
Subject: RE: [PATCH 09/17] Tools: hv: Represent the ipv6 mask using CIDR
 notation



> -----Original Message-----
> From: Borislav Petkov [mailto:bp@...en8.de]
> Sent: Tuesday, July 24, 2012 12:01 PM
> To: KY Srinivasan
> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; virtualization@...ts.osdl.org; olaf@...fle.de;
> apw@...onical.com; netdev@...r.kernel.org; ben@...adent.org.uk
> Subject: Re: [PATCH 09/17] Tools: hv: Represent the ipv6 mask using CIDR
> notation
> 
> On Tue, Jul 24, 2012 at 09:01:33AM -0700, K. Y. Srinivasan wrote:
> > Transform ipv6 subnet information to CIDR notation.
> >
> > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> > Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
> > ---
> >  tools/hv/hv_kvp_daemon.c |   45
> +++++++++++++++++++++++++++++++++++----------
> >  1 files changed, 35 insertions(+), 10 deletions(-)
> >
> > diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
> > index 2c24ebf..007e698 100644
> > --- a/tools/hv/hv_kvp_daemon.c
> > +++ b/tools/hv/hv_kvp_daemon.c
> > @@ -491,6 +491,15 @@ done:
> >  	return;
> >  }
> >
> > +static unsigned int hweight32(unsigned int *w)
> > +{
> > +	unsigned int res = *w - ((*w >> 1) & 0x55555555);
> > +	res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
> > +	res = (res + (res >> 4)) & 0x0F0F0F0F;
> > +	res = res + (res >> 8);
> > +	return (res + (res >> 16)) & 0x000000FF;
> > +}
> 
> What's wrong with the hweight32 version we have already in
> <include/asm-generic/bitops/const_hweight.h> which you can include by
> simply by including <asm-generic/bitops.h>?

Boris,

This code is a user-level daemon that will be compiled outside of the kernel.
I did not want to include Kernel header files for this one function and deal with
all the dependencies that will have to be dealt with.

Regards,

K. Y