linux-kernel - [RFC PATCH RESEND 12/28] mm/mremap: mark VMA as locked while remapping it to a new address range

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Message-ID: <20220901173516.702122-13-surenb@google.com>
Date:   Thu,  1 Sep 2022 10:35:00 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     akpm@...ux-foundation.org
Cc:     michel@...pinasse.org, jglisse@...gle.com, mhocko@...e.com,
        vbabka@...e.cz, hannes@...xchg.org, mgorman@...e.de,
        dave@...olabs.net, willy@...radead.org, liam.howlett@...cle.com,
        peterz@...radead.org, ldufour@...ux.ibm.com,
        laurent.dufour@...ibm.com, paulmck@...nel.org, luto@...nel.org,
        songliubraving@...com, peterx@...hat.com, david@...hat.com,
        dhowells@...hat.com, hughd@...gle.com, bigeasy@...utronix.de,
        kent.overstreet@...ux.dev, rientjes@...gle.com,
        axelrasmussen@...gle.com, joelaf@...gle.com, minchan@...gle.com,
        surenb@...gle.com, kernel-team@...roid.com, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH RESEND 12/28] mm/mremap: mark VMA as locked while
 remapping it to a new address range

Mark VMA as locked before copying it and when copy_vma produces a new VMA.

Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
---
 mm/mmap.c   | 1 +
 mm/mremap.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/mm/mmap.c b/mm/mmap.c
index ade3909c89b4..121544fd90de 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3248,6 +3248,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
 			get_file(new_vma->vm_file);
 		if (new_vma->vm_ops && new_vma->vm_ops->open)
 			new_vma->vm_ops->open(new_vma);
+		vma_mark_locked(new_vma);
 		vma_link(mm, new_vma, prev, rb_link, rb_parent);
 		*need_rmap_locks = false;
 	}
diff --git a/mm/mremap.c b/mm/mremap.c
index b522cd0259a0..bdbf96254e43 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -620,6 +620,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
 			return -ENOMEM;
 	}
 
+	vma_mark_locked(vma);
 	new_pgoff = vma->vm_pgoff + ((old_addr - vma->vm_start) >> PAGE_SHIFT);
 	new_vma = copy_vma(&vma, new_addr, new_len, new_pgoff,
 			   &need_rmap_locks);
-- 
2.37.2.789.g6183377224-goog