From 42fc541404f249778e752ab39c8bc25fcb2dbe1e Mon Sep 17 00:00:00 2001
From: Michel Lespinasse <walken@google.com>
Date: Mon, 8 Jun 2020 21:33:44 -0700
Subject: mmap locking API: add mmap_assert_locked() and
 mmap_assert_write_locked()

Add new APIs to assert that mmap_sem is held.

Using this instead of rwsem_is_locked and lockdep_assert_held[_write]
makes the assertions more tolerant of future changes to the lock type.

Signed-off-by: Michel Lespinasse <walken@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Laurent Dufour <ldufour@linux.ibm.com>
Cc: Liam Howlett <Liam.Howlett@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ying Han <yinghan@google.com>
Link: http://lkml.kernel.org/r/20200520052908.204642-10-walken@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'mm/util.c')

diff --git a/mm/util.c b/mm/util.c
index e7e8647fa205..09f62d7d6e3e 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -437,7 +437,7 @@ int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc,
 	unsigned long locked_vm, limit;
 	int ret = 0;
 
-	lockdep_assert_held_write(&mm->mmap_sem);
+	mmap_assert_write_locked(mm);
 
 	locked_vm = mm->locked_vm;
 	if (inc) {
-- 
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