[PATCH 23/36] HMM: allow to get pointer to spinlock protecting a directory.

[jglisse]

From: JÃrÃme Glisse <jglisse@xxxxxxxxxx>

Several use case for getting pointer to spinlock protecting a directory.

Signed-off-by: JÃrÃme Glisse <jglisse@xxxxxxxxxx>
---
 include/linux/hmm_pt.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/include/linux/hmm_pt.h b/include/linux/hmm_pt.h
index 36f7e00..27668a8 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)
@@ -397,6 +414,13 @@ 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 *iter,
+							 struct hmm_pt *pt)
+{
+	return hmm_pt_directory_lock_ptr(pt, iter->ptd[pt->llevel - 1],
+					 pt->llevel);
+}
+
 static inline void hmm_pt_iter_directory_unlock(struct hmm_pt_iter *iter,
 						struct hmm_pt *pt)
 {
-- 
1.9.3

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