summaryrefslogtreecommitdiff
path: root/include/linux/pfn.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/pfn.h')
-rw-r--r--include/linux/pfn.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/pfn.h b/include/linux/pfn.h
index 97f3e88aead4..2d8e49711b63 100644
--- a/include/linux/pfn.h
+++ b/include/linux/pfn.h
@@ -3,6 +3,15 @@
#ifndef __ASSEMBLY__
#include <linux/types.h>
+
+/*
+ * pfn_t: encapsulates a page-frame number that is optionally backed
+ * by memmap (struct page). Whether a pfn_t has a 'struct page'
+ * backing is indicated by flags in the high bits of the value.
+ */
+typedef struct {
+ unsigned long val;
+} pfn_t;
#endif
#define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)