asm-generic: introduce <asm-generic/pgtable-nop4d.h>

Like with pgtable-nopud.h for 4-level paging, this new header is base
for converting an architectures to properly folded p4d_t level.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 89 insertions, 24 deletions

diff --git a/include/asm-generic/pgtable-nop4d.h b/include/asm-generic/pgtable-nop4d.h
new file mode 100644
index 000000000000..de364ecb8df6
--- /dev/null
+++ b/include/asm-generic/pgtable-nop4d.h
@@ -0,0 +1,56 @@
+#ifndef _PGTABLE_NOP4D_H
+#define _PGTABLE_NOP4D_H
+
+#ifndef __ASSEMBLY__
+
+#define __PAGETABLE_P4D_FOLDED
+
+typedef struct { pgd_t pgd; } p4d_t;
+
+#define P4D_SHIFT       PGDIR_SHIFT
+#define PTRS_PER_P4D    1
+#define P4D_SIZE        (1UL << P4D_SHIFT)
+#define P4D_MASK        (~(P4D_SIZE-1))
+
+/*
+ * The "pgd_xxx()" functions here are trivial for a folded two-level
+ * setup: the p4d is never bad, and a p4d always exists (as it's folded
+ * into the pgd entry)
+ */
+static inline int pgd_none(pgd_t pgd)           { return 0; }
+static inline int pgd_bad(pgd_t pgd)            { return 0; }
+static inline int pgd_present(pgd_t pgd)        { return 1; }
+static inline void pgd_clear(pgd_t *pgd)        { }
+#define p4d_ERROR(p4d)                          (pgd_ERROR((p4d).pgd))
+
+#define pgd_populate(mm, pgd, p4d)              do { } while (0)
+/*
+ * (p4ds are folded into pgds so this doesn't get actually called,
+ * but the define is needed for a generic inline function.)
+ */
+#define set_pgd(pgdptr, pgdval) set_p4d((p4d_t *)(pgdptr), (p4d_t) { pgdval })
+
+static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
+{
+        return (p4d_t *)pgd;
+}
+
+#define p4d_val(x)                              (pgd_val((x).pgd))
+#define __p4d(x)                                ((p4d_t) { __pgd(x) })
+
+#define pgd_page(pgd)                           (p4d_page((p4d_t){ pgd }))
+#define pgd_page_vaddr(pgd)                     (p4d_page_vaddr((p4d_t){ pgd }))
+
+/*
+ * allocating and freeing a p4d is trivial: the 1-entry p4d is
+ * inside the pgd, so has no extra memory associated with it.
+ */
+#define p4d_alloc_one(mm, address)              NULL
+#define p4d_free(mm, x)                         do { } while (0)
+#define __p4d_free_tlb(tlb, x, a)               do { } while (0)
+
+#undef  p4d_addr_end
+#define p4d_addr_end(addr, end)                 (end)
+
+#endif /* __ASSEMBLY__ */
+#endif /* _PGTABLE_NOP4D_H */
diff --git a/include/asm-generic/pgtable-nopud.h b/include/asm-generic/pgtable-nopud.h
index 5e49430a30a4..c2b9b96d6268 100644
--- a/include/asm-generic/pgtable-nopud.h
+++ b/include/asm-generic/pgtable-nopud.h
@@ -6,53 +6,54 @@
 #ifdef __ARCH_USE_5LEVEL_HACK
 #include <asm-generic/pgtable-nop4d-hack.h>
 #else
+#include <asm-generic/pgtable-nop4d.h>
 
 #define __PAGETABLE_PUD_FOLDED
 
 /*
- * Having the pud type consist of a pgd gets the size right, and allows
- * us to conceptually access the pgd entry that this pud is folded into
+ * Having the pud type consist of a p4d gets the size right, and allows
+ * us to conceptually access the p4d entry that this pud is folded into
  * without casting.
  */
-typedef struct { pgd_t pgd; } pud_t;
+typedef struct { p4d_t p4d; } pud_t;
 
-#define PUD_SHIFT       PGDIR_SHIFT
+#define PUD_SHIFT       P4D_SHIFT
 #define PTRS_PER_PUD    1
 #define PUD_SIZE        (1UL << PUD_SHIFT)
 #define PUD_MASK        (~(PUD_SIZE-1))
 
 /*
- * The "pgd_xxx()" functions here are trivial for a folded two-level
+ * The "p4d_xxx()" functions here are trivial for a folded two-level
  * setup: the pud is never bad, and a pud always exists (as it's folded
- * into the pgd entry)
+ * into the p4d entry)
  */
-static inline int pgd_none(pgd_t pgd)           { return 0; }
-static inline int pgd_bad(pgd_t pgd)            { return 0; }
-static inline int pgd_present(pgd_t pgd)        { return 1; }
-static inline void pgd_clear(pgd_t *pgd)        { }
-#define pud_ERROR(pud)                          (pgd_ERROR((pud).pgd))
+static inline int p4d_none(p4d_t p4d)           { return 0; }
+static inline int p4d_bad(p4d_t p4d)            { return 0; }
+static inline int p4d_present(p4d_t p4d)        { return 1; }
+static inline void p4d_clear(p4d_t *p4d)        { }
+#define pud_ERROR(pud)                          (p4d_ERROR((pud).p4d))
 
-#define pgd_populate(mm, pgd, pud)              do { } while (0)
+#define p4d_populate(mm, p4d, pud)              do { } while (0)
 /*
- * (puds are folded into pgds so this doesn't get actually called,
+ * (puds are folded into p4ds so this doesn't get actually called,
  * but the define is needed for a generic inline function.)
  */
-#define set_pgd(pgdptr, pgdval)                 set_pud((pud_t *)(pgdptr), (pud_t) { pgdval })
+#define set_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval })
 
-static inline pud_t * pud_offset(pgd_t * pgd, unsigned long address)
+static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
 {
-        return (pud_t *)pgd;
+        return (pud_t *)p4d;
 }
 
-#define pud_val(x)                              (pgd_val((x).pgd))
-#define __pud(x)                                ((pud_t) { __pgd(x) } )
+#define pud_val(x)                              (p4d_val((x).p4d))
+#define __pud(x)                                ((pud_t) { __p4d(x) })
 
-#define pgd_page(pgd)                           (pud_page((pud_t){ pgd }))
-#define pgd_page_vaddr(pgd)                     (pud_page_vaddr((pud_t){ pgd }))
+#define p4d_page(p4d)                           (pud_page((pud_t){ p4d }))
+#define p4d_page_vaddr(p4d)                     (pud_page_vaddr((pud_t){ p4d }))
 
 /*
  * allocating and freeing a pud is trivial: the 1-entry pud is
- * inside the pgd, so has no extra memory associated with it.
+ * inside the p4d, so has no extra memory associated with it.
  */
 #define pud_alloc_one(mm, address)              NULL
 #define pud_free(mm, x)                         do { } while (0)
diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
index 4329bc6ef04b..8afa4335e5b2 100644
--- a/include/asm-generic/tlb.h
+++ b/include/asm-generic/tlb.h
@@ -270,6 +270,12 @@ static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
                 __pte_free_tlb(tlb, ptep, address);             \
         } while (0)
 
+#define pmd_free_tlb(tlb, pmdp, address)                        \
+        do {                                                    \
+                __tlb_adjust_range(tlb, address, PAGE_SIZE);            \
+                __pmd_free_tlb(tlb, pmdp, address);             \
+        } while (0)
+
 #ifndef __ARCH_HAS_4LEVEL_HACK
 #define pud_free_tlb(tlb, pudp, address)                        \
         do {                                                    \
@@ -278,11 +284,13 @@ static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
         } while (0)
 #endif
 
-#define pmd_free_tlb(tlb, pmdp, address)                        \
+#ifndef __ARCH_HAS_5LEVEL_HACK
+#define p4d_free_tlb(tlb, pudp, address)                        \
         do {                                                    \
-                __tlb_adjust_range(tlb, address, PAGE_SIZE);    \
-                __pmd_free_tlb(tlb, pmdp, address);             \
+                __tlb_adjust_range(tlb, address, PAGE_SIZE);            \
+                __p4d_free_tlb(tlb, pudp, address);             \
         } while (0)
+#endif
 
 #define tlb_migrate_finish(mm) do {} while (0)