diff mbox series

[RFC,10/12] mm: add default definition of p4d_index()

Message ID 20220126173011.3476262-11-ardb@kernel.org (mailing list archive)
State RFC
Headers show
Series arm64: implement read-only page tables | expand

Commit Message

Ard Biesheuvel Jan. 26, 2022, 5:30 p.m. UTC 
Implement a default version of p4d_index() similar to how pud/pmd_index
are defined.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 include/linux/pgtable.h | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index bc8713a76e03..e8aacf6ea207 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -79,6 +79,14 @@  static inline unsigned long pud_index(unsigned long address)
 #define pud_index pud_index
 #endif
 
+#ifndef p4d_index
+static inline unsigned long p4d_index(unsigned long address)
+{
+	return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
+}
+#define p4d_index p4d_index
+#endif
+
 #ifndef pgd_index
 /* Must be a compile-time constant, so implement it as a macro */
 #define pgd_index(a)  (((a) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))