linux-kernel - Re: [PATCH 1/6 v5] Kernel DLPAR Infrastructure

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Date:	Wed, 28 Oct 2009 22:59:13 -0500
From:	Nathan Lynch <ntl@...ox.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Nathan Fontenot <nfont@...tin.ibm.com>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6 v5] Kernel DLPAR Infrastructure

On Thu, 2009-10-29 at 14:08 +1100, Benjamin Herrenschmidt wrote:
> On Wed, 2009-10-28 at 15:53 -0500, Nathan Fontenot wrote:
> > +	struct device_node *dn;
> > +	struct device_node *first_dn = NULL;
> > +	struct device_node *last_dn = NULL;
> > +	struct property *property;
> > +	struct property *last_property = NULL;
> > +	struct cc_workarea *ccwa;
> > +	int cc_token;
> > +	int rc;
> > +
> > +	cc_token = rtas_token("ibm,configure-connector");
> > +	if (cc_token == RTAS_UNKNOWN_SERVICE)
> > +		return NULL;
> > +
> > +	spin_lock(&workarea_lock);
> > +
> > +	ccwa = (struct cc_workarea *)&workarea[0];
> > +	ccwa->drc_index = drc_index;
> > +	ccwa->zero = 0;
> 
> Popping a free page with gfp (or just kmalloc'ing 4K) would avoid the
> need for the lock too.

Not kmalloc -- the alignment of the buffer isn't guaranteed when
slub/slab debug is on, and iirc  the work area needs to be 4K-aligned.
__get_free_page should be fine, I think.


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