Several use case for getting pointer to spinlock protecting a directory.
Signed-off-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
---
include/linux/hmm_pt.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/include/linux/hmm_pt.h b/include/linux/hmm_pt.h
index f745d6c..22100a6 100644
--- a/include/linux/hmm_pt.h
+++ b/include/linux/hmm_pt.h
@@ -255,6 +255,16 @@ static inline void hmm_pt_directory_lock(struct hmm_pt *pt,
spin_lock(&pt->lock);
}
+static inline spinlock_t *hmm_pt_directory_lock_ptr(struct hmm_pt *pt,
+ struct page *ptd,
+ unsigned level)
+{
+ if (level)
+ return &ptd->ptl;
+ else
+ return &pt->lock;
+}
+
static inline void hmm_pt_directory_unlock(struct hmm_pt *pt,
struct page *ptd,
unsigned level)
@@ -272,6 +282,13 @@ static inline void hmm_pt_directory_lock(struct hmm_pt *pt,
spin_lock(&pt->lock);
}
+static inline spinlock_t *hmm_pt_directory_lock_ptr(struct hmm_pt *pt,
+ struct page *ptd,
+ unsigned level)
+{
+ return &pt->lock;
+}
+
static inline void hmm_pt_directory_unlock(struct hmm_pt *pt,
struct page *ptd,
unsigned level)
@@ -358,6 +375,14 @@ static inline void hmm_pt_iter_directory_lock(struct hmm_pt_iter *iter)
hmm_pt_directory_lock(pt, iter->ptd[pt->llevel - 1], pt->llevel);
}
+static inline spinlock_t *hmm_pt_iter_directory_lock_ptr(struct hmm_pt_iter *i)
+{
+ struct hmm_pt *pt = i->pt;
+
+ return hmm_pt_directory_lock_ptr(pt, i->ptd[pt->llevel - 1],
+ pt->llevel);
+}
+
static inline void hmm_pt_iter_directory_unlock(struct hmm_pt_iter *iter)
{
struct hmm_pt *pt = iter->pt;
--
2.4.3
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