[RFC PATCH v4 5/8] hugetlb: rename vma_shareable() and refactor code

[Mike Kravetz <mike.kravetz@oracle.com>]

Rename the routine vma_shareable to vma_addr_pmd_shareable as it is
checking a specific address within the vma.  Refactor code to check if
an aligned range is shareable as this will be needed in a subsequent
patch.

Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
---
 mm/hugetlb.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 25f644a3a981..3d5f3c103927 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6639,26 +6639,33 @@ static unsigned long page_table_shareable(struct vm_area_struct *svma,
 	return saddr;
 }
 
-static bool vma_shareable(struct vm_area_struct *vma, unsigned long addr)
+static bool __vma_aligned_range_pmd_shareable(struct vm_area_struct *vma,
+				unsigned long start, unsigned long end)
 {
-	unsigned long base = addr & PUD_MASK;
-	unsigned long end = base + PUD_SIZE;
-
 	/*
 	 * check on proper vm_flags and page table alignment
 	 */
-	if (vma->vm_flags & VM_MAYSHARE && range_in_vma(vma, base, end))
+	if (vma->vm_flags & VM_MAYSHARE && range_in_vma(vma, start, end))
 		return true;
 	return false;
 }
 
+static bool vma_addr_pmd_shareable(struct vm_area_struct *vma,
+						unsigned long addr)
+{
+	unsigned long start = addr & PUD_MASK;
+	unsigned long end = start + PUD_SIZE;
+
+	return __vma_aligned_range_pmd_shareable(vma, start, end);
+}
+
 bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr)
 {
 #ifdef CONFIG_USERFAULTFD
 	if (uffd_disable_huge_pmd_share(vma))
 		return false;
 #endif
-	return vma_shareable(vma, addr);
+	return vma_addr_pmd_shareable(vma, addr);
 }
 
 /*
-- 
2.35.3