On Tue, Aug 04, 2020 at 12:50:30PM +0300, Mike Rapoport wrote:
From: Mike Rapoport <rppt(a)linux.ibm.com>
The definition of PMD_PAGE_ORDER denoting the number of base pages in the
second-level leaf page is already used by DAX and maybe handy in other
cases as well.
Several architectures already have definition of PMD_ORDER as the size of
second level page table, so to avoid conflict with these definitions use
PMD_PAGE_ORDER name and update DAX respectively.
Signed-off-by: Mike Rapoport <rppt(a)linux.ibm.com>
---
fs/dax.c | 10 +++++-----
include/linux/pgtable.h | 3 +++
2 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index 11b16729b86f..b91d8c8dda45 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -50,7 +50,7 @@ static inline unsigned int pe_order(enum page_entry_size pe_size)
#define PG_PMD_NR (PMD_SIZE >> PAGE_SHIFT)
/* The order of a PMD entry */
-#define PMD_ORDER (PMD_SHIFT - PAGE_SHIFT)
+#define PMD_PAGE_ORDER (PMD_SHIFT - PAGE_SHIFT)
Hm. Wouldn't it conflict with definition in pgtable.h? Or should we
include it instead?
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 56c1e8eb7bb0..79f8443609e7 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -28,6 +28,9 @@
#define USER_PGTABLES_CEILING 0UL
#endif
+/* Number of base pages in a second level leaf page */
+#define PMD_PAGE_ORDER (PMD_SHIFT - PAGE_SHIFT)
+
/*
* A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD]
*
--
Kirill A. Shutemov