sparc64: Revert 16GB huge page support.

It overflows the amount of space available in the initial .text section
of trap handler assembler in some configurations, resulting in build
failures.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 42 insertions, 60 deletions

diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
index bcd8cdbc377f..28ee8d8ffa07 100644
--- a/arch/sparc/mm/hugetlbpage.c
+++ b/arch/sparc/mm/hugetlbpage.c
@@ -143,10 +143,6 @@ static pte_t sun4v_hugepage_shift_to_tte(pte_t entry, unsigned int shift)
 	pte_val(entry) = pte_val(entry) & ~_PAGE_SZALL_4V;
 
 	switch (shift) {
-	case HPAGE_16GB_SHIFT:
-		hugepage_size = _PAGE_SZ16GB_4V;
-		pte_val(entry) |= _PAGE_PUD_HUGE;
-		break;
 	case HPAGE_2GB_SHIFT:
 		hugepage_size = _PAGE_SZ2GB_4V;
 		pte_val(entry) |= _PAGE_PMD_HUGE;
@@ -191,9 +187,6 @@ static unsigned int sun4v_huge_tte_to_shift(pte_t entry)
 	unsigned int shift;
 
 	switch (tte_szbits) {
-	case _PAGE_SZ16GB_4V:
-		shift = HPAGE_16GB_SHIFT;
-		break;
 	case _PAGE_SZ2GB_4V:
 		shift = HPAGE_2GB_SHIFT;
 		break;
@@ -266,19 +259,22 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
 	pgd_t *pgd;
 	pud_t *pud;
 	pmd_t *pmd;
+	pte_t *pte = NULL;
 
 	pgd = pgd_offset(mm, addr);
 	pud = pud_alloc(mm, pgd, addr);
-	if (!pud)
-		return NULL;
-	if (sz >= PUD_SIZE)
-		return (pte_t *)pud;
-	pmd = pmd_alloc(mm, pud, addr);
-	if (!pmd)
-		return NULL;
-	if (sz >= PMD_SIZE)
-		return (pte_t *)pmd;
-	return pte_alloc_map(mm, pmd, addr);
+	if (pud) {
+		pmd = pmd_alloc(mm, pud, addr);
+		if (!pmd)
+			return NULL;
+
+		if (sz >= PMD_SIZE)
+			pte = (pte_t *)pmd;
+		else
+			pte = pte_alloc_map(mm, pmd, addr);
+	}
+
+	return pte;
 }
 
 pte_t *huge_pte_offset(struct mm_struct *mm,
@@ -287,40 +283,34 @@ pte_t *huge_pte_offset(struct mm_struct *mm,
 	pgd_t *pgd;
 	pud_t *pud;
 	pmd_t *pmd;
+	pte_t *pte = NULL;
 
 	pgd = pgd_offset(mm, addr);
-	if (pgd_none(*pgd))
-		return NULL;
-	pud = pud_offset(pgd, addr);
-	if (pud_none(*pud))
-		return NULL;
-	if (is_hugetlb_pud(*pud))
-		return (pte_t *)pud;
-	pmd = pmd_offset(pud, addr);
-	if (pmd_none(*pmd))
-		return NULL;
-	if (is_hugetlb_pmd(*pmd))
-		return (pte_t *)pmd;
-	return pte_offset_map(pmd, addr);
+	if (!pgd_none(*pgd)) {
+		pud = pud_offset(pgd, addr);
+		if (!pud_none(*pud)) {
+			pmd = pmd_offset(pud, addr);
+			if (!pmd_none(*pmd)) {
+				if (is_hugetlb_pmd(*pmd))
+					pte = (pte_t *)pmd;
+				else
+					pte = pte_offset_map(pmd, addr);
+			}
+		}
+	}
+
+	return pte;
 }
 
 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
 		     pte_t *ptep, pte_t entry)
 {
-	unsigned int nptes, orig_shift, shift;
-	unsigned long i, size;
+	unsigned int i, nptes, orig_shift, shift;
+	unsigned long size;
 	pte_t orig;
 
 	size = huge_tte_to_size(entry);
-
-	shift = PAGE_SHIFT;
-	if (size >= PUD_SIZE)
-		shift = PUD_SHIFT;
-	else if (size >= PMD_SIZE)
-		shift = PMD_SHIFT;
-	else
-		shift = PAGE_SHIFT;
-
+	shift = size >= HPAGE_SIZE ? PMD_SHIFT : PAGE_SHIFT;
 	nptes = size >> shift;
 
 	if (!pte_present(*ptep) && pte_present(entry))
@@ -343,23 +333,19 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 			      pte_t *ptep)
 {
-	unsigned int i, nptes, orig_shift, shift;
+	unsigned int i, nptes, hugepage_shift;
 	unsigned long size;
 	pte_t entry;
 
 	entry = *ptep;
 	size = huge_tte_to_size(entry);
-
-	shift = PAGE_SHIFT;
-	if (size >= PUD_SIZE)
-		shift = PUD_SHIFT;
-	else if (size >= PMD_SIZE)
-		shift = PMD_SHIFT;
+	if (size >= HPAGE_SIZE)
+		nptes = size >> PMD_SHIFT;
 	else
-		shift = PAGE_SHIFT;
+		nptes = size >> PAGE_SHIFT;
 
-	nptes = size >> shift;
-	orig_shift = pte_none(entry) ? PAGE_SHIFT : huge_tte_to_shift(entry);
+	hugepage_shift = pte_none(entry) ? PAGE_SHIFT :
+		huge_tte_to_shift(entry);
 
 	if (pte_present(entry))
 		mm->context.hugetlb_pte_count -= nptes;
@@ -368,11 +354,11 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 	for (i = 0; i < nptes; i++)
 		ptep[i] = __pte(0UL);
 
-	maybe_tlb_batch_add(mm, addr, ptep, entry, 0, orig_shift);
+	maybe_tlb_batch_add(mm, addr, ptep, entry, 0, hugepage_shift);
 	/* An HPAGE_SIZE'ed page is composed of two REAL_HPAGE_SIZE'ed pages */
 	if (size == HPAGE_SIZE)
 		maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, entry, 0,
-				    orig_shift);
+				    hugepage_shift);
 
 	return entry;
 }
@@ -385,8 +371,7 @@ int pmd_huge(pmd_t pmd)
 
 int pud_huge(pud_t pud)
 {
-	return !pud_none(pud) &&
-		(pud_val(pud) & (_PAGE_VALID|_PAGE_PUD_HUGE)) != _PAGE_VALID;
+	return 0;
 }
 
 static void hugetlb_free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
@@ -450,11 +435,8 @@ static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
 		next = pud_addr_end(addr, end);
 		if (pud_none_or_clear_bad(pud))
 			continue;
-		if (is_hugetlb_pud(*pud))
-			pud_clear(pud);
-		else
-			hugetlb_free_pmd_range(tlb, pud, addr, next, floor,
-					       ceiling);
+		hugetlb_free_pmd_range(tlb, pud, addr, next, floor,
+				       ceiling);
 	} while (pud++, addr = next, addr != end);
 
 	start &= PGDIR_MASK;