From: Yulei Zhang <yuleixzhang@xxxxxxxxxxx>
As dmem-pmd had been distinguished from thp-pmd, we need to add
pmd_special() such that pmd_trans_huge_lock could fetch ptl
for dmem huge pmd and treat it as stable pmd.
Signed-off-by: Chen Zhuo <sagazchen@xxxxxxxxxxx>
Signed-off-by: Yulei Zhang <yuleixzhang@xxxxxxxxxxx>
---
include/linux/huge_mm.h | 3 ++-
mm/huge_memory.c | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 0365aa9..2514b90 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -242,7 +242,8 @@ static inline int is_swap_pmd(pmd_t pmd)
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
struct vm_area_struct *vma)
{
- if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
+ if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd)
+ || pmd_devmap(*pmd) || pmd_special(*pmd))
return __pmd_trans_huge_lock(pmd, vma);
else
return NULL;
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 9474dbc..31f9e83 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1890,7 +1890,7 @@ spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma)
spinlock_t *ptl;
ptl = pmd_lock(vma->vm_mm, pmd);
if (likely(is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) ||
- pmd_devmap(*pmd)))
+ pmd_devmap(*pmd) || pmd_special(*pmd)))
return ptl;
spin_unlock(ptl);
return NULL;
--
1.8.3.1
