From ba168b52bf8ecb877af294769b0ab32b06bd9293 Mon Sep 17 00:00:00 2001
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: Wed, 27 Mar 2024 19:06:59 +0000
Subject: [PATCH] mm: use rwsem assertion macros for mmap_lock
This slightly strengthens our write assertion when lockdep is disabled.
It also downgrades us from BUG_ON to WARN_ON, but I think that's an
improvement. I don't think dumping the mm_struct was all that valuable;
the call chain is what's important.
Link: https://lkml.kernel.org/r/20240327190701.1082560-1-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/mmap_lock.h | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index 8d38dcb6d044c..de9dc20b01ba7 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -60,16 +60,14 @@ static inline void __mmap_lock_trace_released(struct mm_struct *mm, bool write)
#endif /* CONFIG_TRACING */
-static inline void mmap_assert_locked(struct mm_struct *mm)
+static inline void mmap_assert_locked(const struct mm_struct *mm)
{
- lockdep_assert_held(&mm->mmap_lock);
- VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
+ rwsem_assert_held(&mm->mmap_lock);
}
-static inline void mmap_assert_write_locked(struct mm_struct *mm)
+static inline void mmap_assert_write_locked(const struct mm_struct *mm)
{
- lockdep_assert_held_write(&mm->mmap_lock);
- VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
+ rwsem_assert_held_write(&mm->mmap_lock);
}
#ifdef CONFIG_PER_VMA_LOCK
--
2.30.2