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Subjectlinux-next: build failure after merge of the akpm-current tree
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 <sfr@canb.auug.org.au>
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 <sfr@canb.auug.org.au>
---
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
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