[PATCH 13/16] xfs: implement demand load of utf8norm.ko

[Ben Myers]

On Sat, Oct 04, 2014 at 12:16:51AM -0700, Christoph Hellwig wrote:
> > +int
> > +xfs_init_utf8_module(struct xfs_mount	*mp)
> > +{
> > +	request_module("utf8norm");
> > +
> > +	spin_lock(&utf8norm_lock);
> > +	if (utf8norm_initialized) {
> > +		spin_unlock(&utf8norm_lock);
> > +		return 0;
> > +	}
> > +
> > +	utf8version_is_supported_func = symbol_get(utf8version_is_supported);
> > +	if (!utf8version_is_supported_func)
> > +		goto error;
> > +
> > +	utf8nfkdi_func = symbol_get(utf8nfkdi);
> > +	if (!utf8nfkdi_func)
> > +		goto error;
> 
> Please export a structure with a function pointes so that we just need
> a single symbol_get call.  I'd have to look up how symbol_get works,
> but unless there's something that speaks against this it might be
> simpler to than just do a symbol_get per mounst structure that uses
> utf8 and can point to that structure so that we don't have to add
> additional reference counting infrastructure around it.

Sure, sounds good.  I believe I've seen the approach you are suggesting
used elsewhere and it works fine.

-Ben