Re: [Xen-devel] [PATCH] cleancache: constify cleancache_ops structure

[Julia Lawall <julia.lawall@lip6.fr>]

On Thu, 21 Jan 2016, David Vrabel wrote:

> On 23/12/15 21:06, Julia Lawall wrote:
> > The cleancache_ops structure is never modified, so declare it as const.
> >
> > This also removes the __read_mostly declaration on the cleancache_ops
> > variable declaration, since it seems redundant with const.
> >
> > Done with the help of Coccinelle.
> >
> > Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
> >
> > ---
> >
> > Not sure that the __read_mostly change is correct.  Does it apply to the
> > variable, or to what the variable points to?
>
> The variable, so...

Thanks.  I'll update the patch, unless you have already fixed it.

julia

> > --- a/mm/cleancache.c
> > +++ b/mm/cleancache.c
> > @@ -22,7 +22,7 @@
> >   * cleancache_ops is set by cleancache_register_ops to contain the pointers
> >   * to the cleancache "backend" implementation functions.
> >   */
> > -static struct cleancache_ops *cleancache_ops __read_mostly;
> > +static const struct cleancache_ops *cleancache_ops;
>
> ...you want to retain the __read_mostly here.
>
> David
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