[PATCH 22/36] sparc, thp: remove infrastructure for handling splitting PMDs

[Kirill A. Shutemov]

With new refcounting we don't need to mark PMDs splitting. Let's drop
code to handle this.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
 arch/sparc/include/asm/pgtable_64.h | 16 ----------------
 arch/sparc/mm/fault_64.c            |  3 ---
 arch/sparc/mm/gup.c                 |  2 +-
 3 files changed, 1 insertion(+), 20 deletions(-)

diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 5833dc5ee7d7..7a38d6a576c5 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -681,13 +681,6 @@ static inline unsigned long pmd_trans_huge(pmd_t pmd)
 	return pte_val(pte) & _PAGE_PMD_HUGE;
 }
 
-static inline unsigned long pmd_trans_splitting(pmd_t pmd)
-{
-	pte_t pte = __pte(pmd_val(pmd));
-
-	return pmd_trans_huge(pmd) && pte_special(pte);
-}
-
 #define has_transparent_hugepage() 1
 
 static inline pmd_t pmd_mkold(pmd_t pmd)
@@ -744,15 +737,6 @@ static inline pmd_t pmd_mkwrite(pmd_t pmd)
 	return __pmd(pte_val(pte));
 }
 
-static inline pmd_t pmd_mksplitting(pmd_t pmd)
-{
-	pte_t pte = __pte(pmd_val(pmd));
-
-	pte = pte_mkspecial(pte);
-
-	return __pmd(pte_val(pte));
-}
-
 static inline pgprot_t pmd_pgprot(pmd_t entry)
 {
 	unsigned long val = pmd_val(entry);
diff --git a/arch/sparc/mm/fault_64.c b/arch/sparc/mm/fault_64.c
index 479823249429..a504a4d85ebd 100644
--- a/arch/sparc/mm/fault_64.c
+++ b/arch/sparc/mm/fault_64.c
@@ -113,9 +113,6 @@ static unsigned int get_user_insn(unsigned long tpc)
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 	if (pmd_trans_huge(*pmdp)) {
-		if (pmd_trans_splitting(*pmdp))
-			goto out_irq_enable;
-
 		pa  = pmd_pfn(*pmdp) << PAGE_SHIFT;
 		pa += tpc & ~HPAGE_MASK;
 
diff --git a/arch/sparc/mm/gup.c b/arch/sparc/mm/gup.c
index 9091c5daa2e1..eb3d8e8ebc6b 100644
--- a/arch/sparc/mm/gup.c
+++ b/arch/sparc/mm/gup.c
@@ -114,7 +114,7 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end,
 		pmd_t pmd = *pmdp;
 
 		next = pmd_addr_end(addr, end);
-		if (pmd_none(pmd) || pmd_trans_splitting(pmd))
+		if (pmd_none(pmd))
 			return 0;
 		if (unlikely(pmd_large(pmd))) {
 			if (!gup_huge_pmd(pmdp, pmd, addr, next,
-- 
2.1.4

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