Re: [Xen-devel] [PATCH 1/8] xen/grant-table: Make set/clear page private code shared

[Oleksandr Andrushchenko <andr2000@xxxxxxxxx>]

On 05/30/2018 07:24 AM, Juergen Gross wrote:
> On 25/05/18 17:33, Oleksandr Andrushchenko wrote:
> > From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> >
> > Make set/clear page private code shared and accessible to
> > other kernel modules which can re-use these instead of open-coding.
> >
> > Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> > ---
> >   drivers/xen/grant-table.c | 54 +++++++++++++++++++++++++--------------
> >   include/xen/grant_table.h |  3 +++
> >   2 files changed, 38 insertions(+), 19 deletions(-)
> >
> > diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
> > index 27be107d6480..d7488226e1f2 100644
> > --- a/drivers/xen/grant-table.c
> > +++ b/drivers/xen/grant-table.c
> > @@ -769,29 +769,18 @@ void gnttab_free_auto_xlat_frames(void)
> >   }
> >   EXPORT_SYMBOL_GPL(gnttab_free_auto_xlat_frames);
> >   
> > -/**
> > - * gnttab_alloc_pages - alloc pages suitable for grant mapping into
> > - * @nr_pages: number of pages to alloc
> > - * @pages: returns the pages
> > - */
> > -int gnttab_alloc_pages(int nr_pages, struct page **pages)
> > +int gnttab_pages_set_private(int nr_pages, struct page **pages)
> >   {
> >         int i;
> > -       int ret;
> > -
> > -       ret = alloc_xenballooned_pages(nr_pages, pages);
> > -       if (ret < 0)
> > -               return ret;
> >   
> >   	for (i = 0; i < nr_pages; i++) {
> >   #if BITS_PER_LONG < 64
> >                 struct xen_page_foreign *foreign;
> >   
> >   		foreign = kzalloc(sizeof(*foreign), GFP_KERNEL);
> > -               if (!foreign) {
> > -                       gnttab_free_pages(nr_pages, pages);
> > +               if (!foreign)
> >                         return -ENOMEM;
> > -               }
> > +
> >                 set_page_private(pages[i], (unsigned long)foreign);
> >   #endif
> >                 SetPagePrivate(pages[i]);
> > @@ -799,14 +788,30 @@ int gnttab_alloc_pages(int nr_pages, struct page **pages)
> >   
> >   	return 0;
> >   }
> > -EXPORT_SYMBOL(gnttab_alloc_pages);
> > +EXPORT_SYMBOL(gnttab_pages_set_private);
> EXPORT_SYMBOL_GPL()
Sure, I was confused by the fact that there are only 2 functions in the file
which are exported as:
 - EXPORT_SYMBOL(gnttab_alloc_pages);
 - EXPORT_SYMBOL(gnttab_free_pages);
and those were the base for the new 
gnttab_pages_set_private/gnttab_pages_clear_private
This made me think I have to retain the same EXPORT_SYMBOL for them.
Do you want me to add one more patch into this series and change
gnttab_alloc_pages/gnttab_free_pages to GPL as well?
> >   
> >   /**
> > - * gnttab_free_pages - free pages allocated by gnttab_alloc_pages()
> > - * @nr_pages; number of pages to free
> > - * @pages: the pages
> > + * gnttab_alloc_pages - alloc pages suitable for grant mapping into
> > + * @nr_pages: number of pages to alloc
> > + * @pages: returns the pages
> >    */
> > -void gnttab_free_pages(int nr_pages, struct page **pages)
> > +int gnttab_alloc_pages(int nr_pages, struct page **pages)
> > +{
> > +       int ret;
> > +
> > +       ret = alloc_xenballooned_pages(nr_pages, pages);
> > +       if (ret < 0)
> > +               return ret;
> > +
> > +       ret = gnttab_pages_set_private(nr_pages, pages);
> > +       if (ret < 0)
> > +               gnttab_free_pages(nr_pages, pages);
> > +
> > +       return ret;
> > +}
> > +EXPORT_SYMBOL(gnttab_alloc_pages);
> > +
> > +void gnttab_pages_clear_private(int nr_pages, struct page **pages)
> >   {
> >         int i;
> >   
> > @@ -818,6 +823,17 @@ void gnttab_free_pages(int nr_pages, struct page **pages)
> >                         ClearPagePrivate(pages[i]);
> >                 }
> >         }
> > +}
> > +EXPORT_SYMBOL(gnttab_pages_clear_private);
> EXPORT_SYMBOL_GPL()
Will change
> Juergen
Thank you,
Oleksandr

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