mm: remove __ARCH_HAS_4LEVEL_HACK and include/asm-generic/4level-fixup.h

There are no architectures that use include/asm-generic/4level-fixup.h
therefore it can be removed along with __ARCH_HAS_4LEVEL_HACK define.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mike Rapoport <[email protected]>
Cc: Anatoly Pugachev <[email protected]>
Cc: Anton Ivanov <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Greentime Hu <[email protected]>
Cc: Greg Ungerer <[email protected]>
Cc: Helge Deller <[email protected]>
Cc: "James E.J. Bottomley" <[email protected]>
Cc: Jeff Dike <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Mark Salter <[email protected]>
Cc: Matt Turner <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Peter Rosin <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Rolf Eike Beer <[email protected]>
Cc: Russell King <[email protected]>
Cc: Russell King <[email protected]>
Cc: Sam Creasey <[email protected]>
Cc: Vincent Chen <[email protected]>
Cc: Vineet Gupta <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

3 files changed, 5 insertions, 52 deletions

diff --git a/include/asm-generic/4level-fixup.h b/include/asm-generic/4level-fixup.h
deleted file mode 100644
index c86cf7cb4bba..000000000000
--- a/include/asm-generic/4level-fixup.h
+++ /dev/null
@@ -1,39 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _4LEVEL_FIXUP_H
-#define _4LEVEL_FIXUP_H
-
-#define __ARCH_HAS_4LEVEL_HACK
-#define __PAGETABLE_PUD_FOLDED 1
-
-#define PUD_SHIFT			PGDIR_SHIFT
-#define PUD_SIZE			PGDIR_SIZE
-#define PUD_MASK			PGDIR_MASK
-#define PTRS_PER_PUD			1
-
-#define pud_t				pgd_t
-
-#define pmd_alloc(mm, pud, address) \
-	((unlikely(pgd_none(*(pud))) && __pmd_alloc(mm, pud, address))? \
- 		NULL: pmd_offset(pud, address))
-
-#define pud_offset(pgd, start)		(pgd)
-#define pud_none(pud)			0
-#define pud_bad(pud)			0
-#define pud_present(pud)		1
-#define pud_ERROR(pud)			do { } while (0)
-#define pud_clear(pud)			pgd_clear(pud)
-#define pud_val(pud)			pgd_val(pud)
-#define pud_populate(mm, pud, pmd)	pgd_populate(mm, pud, pmd)
-#define pud_page(pud)			pgd_page(pud)
-#define pud_page_vaddr(pud)		pgd_page_vaddr(pud)
-
-#undef pud_free_tlb
-#define pud_free_tlb(tlb, x, addr)	do { } while (0)
-#define pud_free(mm, x)			do { } while (0)
-
-#undef  pud_addr_end
-#define pud_addr_end(addr, end)		(end)
-
-#include <asm-generic/5level-fixup.h>
-
-#endif
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8b0ef04b6d15..c97ea3b694e6 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1838,12 +1838,12 @@ static inline void mm_dec_nr_ptes(struct mm_struct *mm) {}
 int __pte_alloc(struct mm_struct *mm, pmd_t *pmd);
 int __pte_alloc_kernel(pmd_t *pmd);
 
+#if defined(CONFIG_MMU)
+
 /*
- * The following ifdef needed to get the 4level-fixup.h header to work.
- * Remove it when 4level-fixup.h has been removed.
+ * The following ifdef needed to get the 5level-fixup.h header to work.
+ * Remove it when 5level-fixup.h has been removed.
  */
-#if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
-
 #ifndef __ARCH_HAS_5LEVEL_HACK
 static inline p4d_t *p4d_alloc(struct mm_struct *mm, pgd_t *pgd,
 		unsigned long address)
@@ -1865,7 +1865,7 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a
 	return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
 		NULL: pmd_offset(pud, address);
 }
-#endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
+#endif /* CONFIG_MMU */
 
 #if USE_SPLIT_PTE_PTLOCKS
 #if ALLOC_SPLIT_PTLOCKS
diff --git a/mm/memory.c b/mm/memory.c
index e455160e0f75..606da187d1de 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4197,19 +4197,11 @@ int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
 	smp_wmb(); /* See comment in __pte_alloc */
 
 	ptl = pud_lock(mm, pud);
-#ifndef __ARCH_HAS_4LEVEL_HACK
 	if (!pud_present(*pud)) {
 		mm_inc_nr_pmds(mm);
 		pud_populate(mm, pud, new);
 	} else	/* Another has populated it */
 		pmd_free(mm, new);
-#else
-	if (!pgd_present(*pud)) {
-		mm_inc_nr_pmds(mm);
-		pgd_populate(mm, pud, new);
-	} else /* Another has populated it */
-		pmd_free(mm, new);
-#endif /* __ARCH_HAS_4LEVEL_HACK */
 	spin_unlock(ptl);
 	return 0;
 }