On 25/05/18 17:33, Oleksandr Andrushchenko wrote:
From: Oleksandr Andrushchenko oleksandr_andrushchenko@epam.com
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@epam.com
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()
/**
- 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()
Juergen