linux-kernel - [PATCH v2 5/9] hugetlb: rename vma

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Message-Id: <20220914221810.95771-6-mike.kravetz@oracle.com>
Date:   Wed, 14 Sep 2022 15:18:06 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Muchun Song <songmuchun@...edance.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        David Hildenbrand <david@...hat.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Michal Hocko <mhocko@...e.com>, Peter Xu <peterx@...hat.com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Prakash Sangappa <prakash.sangappa@...cle.com>,
        James Houghton <jthoughton@...gle.com>,
        Mina Almasry <almasrymina@...gle.com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Ray Fucillo <Ray.Fucillo@...ersystems.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: [PATCH v2 5/9] 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.

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

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index eb38ae3e7a83..8117bc299c46 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);
 }
 
 /*
-- 
2.37.2