Subject: linux-next: build failure after merge of the akpm-current tree

From: Stephen Rothwell <[email-masked]>
Date: Mon, 24 Jun 2019 21:00:43 +1000

Hi Andrew,

After merging the akpm-current tree, today's linux-next build (arm
multi_v7_defconfig) failed like this:

mm/util.c: In function '__account_locked_vm':
mm/util.c:372:2: error: implicit declaration of function 'lockdep_assert_held_exclusive'; did you mean 'lockdep_assert_held_once'? [-Werror=implicit-function-declaration]
  lockdep_assert_held_exclusive(&mm->mmap_sem);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  lockdep_assert_held_once
cc1: some warnings being treated as errors

Caused by commit

  610509219f27 ("mm-add-account_locked_vm-utility-function-v3")

interacting with commit

  9ffbe8ac05db ("locking/lockdep: Rename lockdep_assert_held_exclusive() -> lockdep_assert_held_write()")

from the tip tree.

I have applied the following merge fix patch.

From: Stephen Rothwell <[email-masked]>
Date: Mon, 24 Jun 2019 20:57:23 +1000
Subject: [PATCH] merge fix for "locking/lockdep: Rename lockdep_assert_held_exclusive() -> lockdep_assert_held_write()"

Signed-off-by: Stephen Rothwell <[email-masked]>
---
 mm/util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/util.c b/mm/util.c
index 021648a8a3a3..932b00a7c28e 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -369,7 +369,7 @@ int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc,
 	unsigned long locked_vm, limit;
 	int ret = 0;
 
-	lockdep_assert_held_exclusive(&mm->mmap_sem);
+	lockdep_assert_held_write(&mm->mmap_sem);
 
 	locked_vm = mm->locked_vm;
 	if (inc) {
-- 
2.20.1

-- 
Cheers,
Stephen Rothwell