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authorOleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>2018-07-20 12:01:43 +0300
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2018-07-26 23:05:13 -0400
commit8c3799ee25e1fda159099af09f5f2e86091e41d4 (patch)
tree6fecf9c3c222154e0c55ab54cfd9feb9f558c1b9 /drivers/xen/grant-table.c
parentd72e90f33aa4709ebecc5005562f52335e106a60 (diff)
xen/grant-table: Make set/clear page private code shared
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> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/xen/grant-table.c')
-rw-r--r--drivers/xen/grant-table.c54
1 files changed, 35 insertions, 19 deletions
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index ba9f3eec2bd0..bb4840653bf2 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_GPL(gnttab_alloc_pages);
+EXPORT_SYMBOL_GPL(gnttab_pages_set_private);
/**
- * 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_GPL(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_GPL(gnttab_pages_clear_private);
+
+/**
+ * gnttab_free_pages - free pages allocated by gnttab_alloc_pages()
+ * @nr_pages; number of pages to free
+ * @pages: the pages
+ */
+void gnttab_free_pages(int nr_pages, struct page **pages)
+{
+ gnttab_pages_clear_private(nr_pages, pages);
free_xenballooned_pages(nr_pages, pages);
}
EXPORT_SYMBOL_GPL(gnttab_free_pages);