linux-kernel - [PATCH 10/20] mm: add mmap_read_lock_killable

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Message-ID: <20250124235454.84587-11-anthony.yznaga@oracle.com>
Date: Fri, 24 Jan 2025 15:54:44 -0800
From: Anthony Yznaga <anthony.yznaga@...cle.com>
To: akpm@...ux-foundation.org, willy@...radead.org, markhemm@...glemail.com,
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Subject: [PATCH 10/20] mm: add mmap_read_lock_killable_nested()

This will be used to support mshare functionality where the read
lock on an mshare host mm is taken while holding the lock on a
process mm.

Signed-off-by: Anthony Yznaga <anthony.yznaga@...cle.com>
---
 include/linux/mmap_lock.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index 45a21faa3ff6..4671b4435d2a 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -191,6 +191,13 @@ static inline void mmap_read_lock(struct mm_struct *mm)
 	__mmap_lock_trace_acquire_returned(mm, false, true);
 }
 
+static inline void mmap_read_lock_nested(struct mm_struct *mm, int subclass)
+{
+	__mmap_lock_trace_start_locking(mm, false);
+	down_read_nested(&mm->mmap_lock, subclass);
+	__mmap_lock_trace_acquire_returned(mm, false, true);
+}
+
 static inline int mmap_read_lock_killable(struct mm_struct *mm)
 {
 	int ret;
-- 
2.43.5