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

Mike Kravetz
2022-08-24T17:59:16Z

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 a6eb46c64baf..758b6844d566 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6648,26 +6648,33 @@ 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);
}

/*
--
2.37.1