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Message-ID: <20240822192543.3359552-8-Liam.Howlett@oracle.com>
Date: Thu, 22 Aug 2024 15:25:29 -0400
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Suren Baghdasaryan <surenb@...gle.com>,
Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
Matthew Wilcox <willy@...radead.org>, Vlastimil Babka <vbabka@...e.cz>,
sidhartha.kumar@...cle.com, Bert Karwatzki <spasswolf@....de>,
Jiri Olsa <olsajiri@...il.com>, Kees Cook <kees@...nel.org>,
"Paul E . McKenney" <paulmck@...nel.org>,
"Liam R. Howlett" <Liam.Howlett@...cle.com>,
"Liam R . Howlett" <Liam.Howlett@...cle.com>
Subject: [PATCH v7 07/21] mm/vma: Extract validate_mm() from vma_complete()
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
vma_complete() will need to be called during an unsafe time to call
validate_mm(). Extract the call in all places now so that only one
location can be modified in the next change.
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
---
mm/mmap.c | 1 +
mm/vma.c | 5 ++++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index 30ae4cb5cec9..112f2111c457 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1796,6 +1796,7 @@ static int do_brk_flags(struct vma_iterator *vmi, struct vm_area_struct *vma,
vma_iter_store(vmi, vma);
vma_complete(&vp, vmi, mm);
+ validate_mm(mm);
khugepaged_enter_vma(vma, flags);
goto out;
}
diff --git a/mm/vma.c b/mm/vma.c
index 58604fe3bd03..f061aa402f92 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -269,6 +269,7 @@ static int __split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
/* vma_complete stores the new vma */
vma_complete(&vp, vmi, vma->vm_mm);
+ validate_mm(vma->vm_mm);
/* Success. */
if (new_below)
@@ -548,6 +549,7 @@ int vma_expand(struct vma_iterator *vmi, struct vm_area_struct *vma,
vma_iter_store(vmi, vma);
vma_complete(&vp, vmi, vma->vm_mm);
+ validate_mm(vma->vm_mm);
return 0;
nomem:
@@ -589,6 +591,7 @@ int vma_shrink(struct vma_iterator *vmi, struct vm_area_struct *vma,
vma_iter_clear(vmi);
vma_set_range(vma, start, end, pgoff);
vma_complete(&vp, vmi, vma->vm_mm);
+ validate_mm(vma->vm_mm);
return 0;
}
@@ -668,7 +671,6 @@ void vma_complete(struct vma_prepare *vp,
}
if (vp->insert && vp->file)
uprobe_mmap(vp->insert);
- validate_mm(mm);
}
/*
@@ -1202,6 +1204,7 @@ static struct vm_area_struct
}
vma_complete(&vp, vmi, mm);
+ validate_mm(mm);
khugepaged_enter_vma(res, vm_flags);
return res;
--
2.43.0
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