add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/s390/mm/hugetlbpage.c
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@@ -189,7 +189,7 @@
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 	return pte;
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 }
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-pte_t *huge_pte_alloc(struct mm_struct *mm,
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+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
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 			unsigned long addr, unsigned long sz)
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 {
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 	pgd_t *pgdp;
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@@ -254,25 +254,15 @@
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 	return pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT);
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 }
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-static __init int setup_hugepagesz(char *opt)
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+bool __init arch_hugetlb_valid_size(unsigned long size)
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 {
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-	unsigned long size;
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-	char *string = opt;
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-
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-	size = memparse(opt, &opt);
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-	if (MACHINE_HAS_EDAT1 && size == PMD_SIZE) {
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-		hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
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-	} else if (MACHINE_HAS_EDAT2 && size == PUD_SIZE) {
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-		hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
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-	} else {
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-		hugetlb_bad_size();
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-		pr_err("hugepagesz= specifies an unsupported page size %s\n",
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-			string);
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-		return 0;
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-	}
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-	return 1;
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+	if (MACHINE_HAS_EDAT1 && size == PMD_SIZE)
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+		return true;
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+	else if (MACHINE_HAS_EDAT2 && size == PUD_SIZE)
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+		return true;
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+	else
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+		return false;
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 }
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-__setup("hugepagesz=", setup_hugepagesz);
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 static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
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 		unsigned long addr, unsigned long len,
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@@ -329,7 +319,6 @@
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 	struct hstate *h = hstate_file(file);
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 	struct mm_struct *mm = current->mm;
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 	struct vm_area_struct *vma;
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-	int rc;
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 	if (len & ~huge_page_mask(h))
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 		return -EINVAL;
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@@ -356,15 +345,9 @@
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 	else
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 		addr = hugetlb_get_unmapped_area_topdown(file, addr, len,
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 				pgoff, flags);
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-	if (addr & ~PAGE_MASK)
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+	if (offset_in_page(addr))
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 		return addr;
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 check_asce_limit:
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-	if (addr + len > current->mm->context.asce_limit &&
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-	    addr + len <= TASK_SIZE) {
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-		rc = crst_table_upgrade(mm, addr + len);
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-		if (rc)
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-			return (unsigned long) rc;
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-	}
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-	return addr;
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+	return check_asce_limit(mm, addr, len);
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 }