linux-kernel - [PATCH 03/64] mm: introduce mm locking wrappers

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Message-Id: <20180205012754.23615-4-dbueso@wotan.suse.de>
Date:   Mon,  5 Feb 2018 02:26:53 +0100
From:   Davidlohr Bueso <dbueso@...e.de>
To:     akpm@...ux-foundation.org, mingo@...nel.org
Cc:     peterz@...radead.org, ldufour@...ux.vnet.ibm.com, jack@...e.cz,
        mhocko@...nel.org, kirill.shutemov@...ux.intel.com,
        mawilcox@...rosoft.com, mgorman@...hsingularity.net,
        dave@...olabs.net, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH 03/64] mm: introduce mm locking wrappers

From: Davidlohr Bueso <dave@...olabs.net>

This patch adds the necessary wrappers to encapsulate mmap_sem
locking and will enable any future changes to be a lot more
confined to here. In addition, future users will incrementally
be added in the next patches. mm_[read/write]_[un]lock() naming
is used.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 include/linux/mm.h | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 47c06fd20f6a..9d2ed23aa894 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -12,6 +12,7 @@
 #include <linux/list.h>
 #include <linux/mmzone.h>
 #include <linux/rbtree.h>
+#include <linux/range_lock.h>
 #include <linux/atomic.h>
 #include <linux/debug_locks.h>
 #include <linux/mm_types.h>
@@ -2675,5 +2676,77 @@ void __init setup_nr_node_ids(void);
 static inline void setup_nr_node_ids(void) {}
 #endif
 
+/*
+ * Address space locking wrappers.
+ */
+static inline bool mm_is_locked(struct mm_struct *mm,
+				struct range_lock *range)
+{
+	return rwsem_is_locked(&mm->mmap_sem);
+}
+
+/* Reader wrappers */
+static inline int mm_read_trylock(struct mm_struct *mm,
+				  struct range_lock *range)
+{
+	return down_read_trylock(&mm->mmap_sem);
+}
+
+static inline void mm_read_lock(struct mm_struct *mm, struct range_lock *range)
+{
+	down_read(&mm->mmap_sem);
+}
+
+static inline void mm_read_lock_nested(struct mm_struct *mm,
+				       struct range_lock *range, int subclass)
+{
+	down_read_nested(&mm->mmap_sem, subclass);
+}
+
+static inline void mm_read_unlock(struct mm_struct *mm,
+				  struct range_lock *range)
+{
+	up_read(&mm->mmap_sem);
+}
+
+/* Writer wrappers */
+static inline int mm_write_trylock(struct mm_struct *mm,
+				   struct range_lock *range)
+{
+	return down_write_trylock(&mm->mmap_sem);
+}
+
+static inline void mm_write_lock(struct mm_struct *mm, struct range_lock *range)
+{
+	down_write(&mm->mmap_sem);
+}
+
+static inline int mm_write_lock_killable(struct mm_struct *mm,
+					 struct range_lock *range)
+{
+	return down_write_killable(&mm->mmap_sem);
+}
+
+static inline void mm_downgrade_write(struct mm_struct *mm,
+				      struct range_lock *range)
+{
+	downgrade_write(&mm->mmap_sem);
+}
+
+static inline void mm_write_unlock(struct mm_struct *mm,
+				   struct range_lock *range)
+{
+	up_write(&mm->mmap_sem);
+}
+
+static inline void mm_write_lock_nested(struct mm_struct *mm,
+					struct range_lock *range, int subclass)
+{
+	down_write_nested(&mm->mmap_sem, subclass);
+}
+
+#define mm_write_nest_lock(mm, range, nest_lock)		\
+	down_write_nest_lock(&(mm)->mmap_sem, nest_lock)
+
 #endif /* __KERNEL__ */
 #endif /* _LINUX_MM_H */
-- 
2.13.6