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Date:   Thu, 26 Mar 2020 00:02:30 -0700
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Subject: [PATCH 2/8] MMU notifier: use the new mmap locking API
From:   Michel Lespinasse <walken@google.com>
To:     Andrew Morton <akpm@linux-foundation.org>,
        linux-mm <linux-mm@kvack.org>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Laurent Dufour <ldufour@linux.ibm.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Matthew Wilcox <willy@infradead.org>,
        Liam Howlett <Liam.Howlett@oracle.com>,
        Jerome Glisse <jglisse@redhat.com>,
        Davidlohr Bueso <dave@stgolabs.net>,
        David Rientjes <rientjes@google.com>,
        Hugh Dickins <hughd@google.com>, Ying Han <yinghan@google.com>,
        Michel Lespinasse <walken@google.com>
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Sender: linux-kernel-owner@vger.kernel.org
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This use is converted manually ahead of the next patch in the series,
as it requires including a new header which the automated conversion
would miss.

Signed-off-by: Michel Lespinasse <walken@google.com>
---
 include/linux/mmu_notifier.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index 736f6918335e..2f462710a1a4 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -5,6 +5,7 @@
 #include <linux/list.h>
 #include <linux/spinlock.h>
 #include <linux/mm_types.h>
+#include <linux/mmap_lock.h>
 #include <linux/srcu.h>
 #include <linux/interval_tree.h>
 
@@ -277,9 +278,9 @@ mmu_notifier_get(const struct mmu_notifier_ops *ops, struct mm_struct *mm)
 {
 	struct mmu_notifier *ret;
 
-	down_write(&mm->mmap_sem);
+	mmap_write_lock(mm);
 	ret = mmu_notifier_get_locked(ops, mm);
-	up_write(&mm->mmap_sem);
+	mmap_write_unlock(mm);
 	return ret;
 }
 void mmu_notifier_put(struct mmu_notifier *subscription);
-- 
2.25.1.696.g5e7596f4ac-goog