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Message-ID: <20230227173632.3292573-18-surenb@google.com>
Date: Mon, 27 Feb 2023 09:36:16 -0800
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@...hsingularity.net,
dave@...olabs.net, willy@...radead.org, liam.howlett@...cle.com,
peterz@...radead.org, ldufour@...ux.ibm.com, paulmck@...nel.org,
mingo@...hat.com, will@...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, punit.agrawal@...edance.com,
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chriscli@...gle.com, axelrasmussen@...gle.com, joelaf@...gle.com,
minchan@...gle.com, rppt@...nel.org, jannh@...gle.com,
shakeelb@...gle.com, tatashin@...gle.com, edumazet@...gle.com,
gthelen@...gle.com, gurua@...gle.com, arjunroy@...gle.com,
soheil@...gle.com, leewalsh@...gle.com, posk@...gle.com,
michalechner92@...glemail.com, linux-mm@...ck.org,
linux-arm-kernel@...ts.infradead.org,
linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
linux-kernel@...r.kernel.org, kernel-team@...roid.com,
Suren Baghdasaryan <surenb@...gle.com>,
Laurent Dufour <laurent.dufour@...ibm.com>
Subject: [PATCH v4 17/33] mm/mremap: write-lock VMA while remapping it to a
new address range
Write-lock VMA as locked before copying it and when copy_vma produces
a new VMA.
Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
Reviewed-by: Laurent Dufour <laurent.dufour@...ibm.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 e73fbb84ce12..1f42b9a52b9b 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3189,6 +3189,7 @@ 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_start_write(new_vma);
if (vma_link(mm, new_vma))
goto out_vma_link;
*need_rmap_locks = false;
diff --git a/mm/mremap.c b/mm/mremap.c
index 1ddf7beb62e9..327c38eb132e 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -623,6 +623,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
return -ENOMEM;
}
+ vma_start_write(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);
--
2.39.2.722.g9855ee24e9-goog
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