hugetlb: rename vma_shareable() and refactor code

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.

Link: https://lkml.kernel.org/r/20220914221810.95771-6-mike.kravetz@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: James Houghton <jthoughton@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Prakash Sangappa <prakash.sangappa@oracle.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index accb166..482f7f3 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6640,26 +6640,33 @@ 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);
 }
 
 /*