linux-kernel - [PATCH 2/5] mm: Use rwsem_is_write_locked in mmap_assert_write

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Message-Id: <20230907174705.2976191-3-willy@infradead.org>
Date:   Thu,  7 Sep 2023 18:47:02 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Chandan Babu R <chandan.babu@...cle.com>,
        "Darrick J . Wong" <djwong@...nel.org>, linux-xfs@...r.kernel.org
Subject: [PATCH 2/5] mm: Use rwsem_is_write_locked in mmap_assert_write_locked

This slightly strengthens our checks when lockdep is disabled.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/mmap_lock.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index 8d38dcb6d044..0258b06668e8 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -69,7 +69,7 @@ static inline void mmap_assert_locked(struct mm_struct *mm)
 static inline void mmap_assert_write_locked(struct mm_struct *mm)
 {
 	lockdep_assert_held_write(&mm->mmap_lock);
-	VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
+	VM_BUG_ON_MM(!rwsem_is_write_locked(&mm->mmap_lock), mm);
 }
 
 #ifdef CONFIG_PER_VMA_LOCK
-- 
2.40.1