[RFCv2 07/13] mm: Add hwpoison_entry_to_pfn() and hwpoison_entry_to_page()

Kirill A. Shutemov
2021-04-16T15:41:58Z

Add helpers to convert hwpoison swap entry to pfn and page.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/swapops.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/include/linux/swapops.h b/include/linux/swapops.h
index d9b7c9132c2f..520589b12fb3 100644
--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -323,6 +323,16 @@ static inline int is_hwpoison_entry(swp_entry_t entry)
return swp_type(entry) == SWP_HWPOISON;
}

+static inline unsigned long hwpoison_entry_to_pfn(swp_entry_t entry)
+{
+ return swp_offset(entry);
+}
+
+static inline struct page *hwpoison_entry_to_page(swp_entry_t entry)
+{
+ return pfn_to_page(hwpoison_entry_to_pfn(entry));
+}
+
static inline void num_poisoned_pages_inc(void)
{
atomic_long_inc(&num_poisoned_pages);
@@ -345,6 +355,16 @@ static inline int is_hwpoison_entry(swp_entry_t swp)
return 0;
}

+static inline unsigned long hwpoison_entry_to_pfn(swp_entry_t entry)
+{
+ return 0;
+}
+
+static inline struct page *hwpoison_entry_to_page(swp_entry_t entry)
+{
+ return NULL;
+}
+
static inline void num_poisoned_pages_inc(void)
{
}
--
2.26.3