From: "Liam R. Howlett" <Liam.Howlett@oracle.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Suren Baghdasaryan <surenb@google.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Matthew Wilcox <willy@infradead.org>,
Vlastimil Babka <vbabka@suse.cz>,
sidhartha.kumar@oracle.com, Bert Karwatzki <spasswolf@web.de>,
Jiri Olsa <olsajiri@gmail.com>, Kees Cook <kees@kernel.org>,
"Paul E . McKenney" <paulmck@kernel.org>,
"Liam R. Howlett" <Liam.Howlett@Oracle.com>
Subject: [PATCH v6 20/20] mm/vma: Drop incorrect comment from vms_gather_munmap_vmas()
Date: Tue, 20 Aug 2024 19:57:29 -0400 [thread overview]
Message-ID: <20240820235730.2852400-21-Liam.Howlett@oracle.com> (raw)
In-Reply-To: <20240820235730.2852400-1-Liam.Howlett@oracle.com>
From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>
The comment has been outdated since 6b73cff239e52 ("mm: change munmap
splitting order and move_vma()"). The move_vma() was altered to fix the
fragile state of the accounting since then.
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
---
mm/vma.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/mm/vma.c b/mm/vma.c
index f277ab1b0175..dd064b0abe17 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -750,13 +750,8 @@ int vms_gather_munmap_vmas(struct vma_munmap_struct *vms,
/*
* If we need to split any vma, do it now to save pain later.
- *
- * Note: mremap's move_vma VM_ACCOUNT handling assumes a partially
- * unmapped vm_area_struct will remain in use: so lower split_vma
- * places tmp vma above, and higher split_vma places tmp vma below.
+ * Does it split the first one?
*/
-
- /* Does it split the first one? */
if (vms->start > vms->vma->vm_start) {
/*
--
2.43.0
prev parent reply other threads:[~2024-08-20 23:59 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-20 23:57 [PATCH v6 00/20] Avoid MAP_FIXED gap exposure Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 01/20] mm/vma: Correctly position vma_iterator in __split_vma() Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 02/20] mm/vma: Introduce abort_munmap_vmas() Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 03/20] mm/vma: Introduce vmi_complete_munmap_vmas() Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 04/20] mm/vma: Extract the gathering of vmas from do_vmi_align_munmap() Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 05/20] mm/vma: Introduce vma_munmap_struct for use in munmap operations Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 06/20] mm/vma: Change munmap to use vma_munmap_struct() for accounting and surrounding vmas Liam R. Howlett
2024-08-21 9:59 ` Lorenzo Stoakes
2024-08-21 13:17 ` Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 07/20] mm/vma: Extract validate_mm() from vma_complete() Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 08/20] mm/vma: Inline munmap operation in mmap_region() Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 09/20] mm/vma: Expand mmap_region() munmap call Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 10/20] mm/vma: Support vma == NULL in init_vma_munmap() Liam R. Howlett
2024-08-21 10:07 ` Lorenzo Stoakes
2024-08-21 13:18 ` Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 11/20] mm/mmap: Reposition vma iterator in mmap_region() Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 12/20] mm/vma: Track start and end for munmap in vma_munmap_struct Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 13/20] mm: Clean up unmap_region() argument list Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 14/20] mm/mmap: Avoid zeroing vma tree in mmap_region() Liam R. Howlett
2024-08-21 11:02 ` Lorenzo Stoakes
2024-08-21 15:09 ` Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 15/20] mm: Change failure of MAP_FIXED to restoring the gap on failure Liam R. Howlett
2024-08-21 11:56 ` Lorenzo Stoakes
2024-08-21 13:31 ` Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 16/20] mm/mmap: Use PHYS_PFN in mmap_region() Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 17/20] mm/mmap: Use vms accounted pages " Liam R. Howlett
2024-08-21 16:35 ` Paul Moore
2024-08-21 17:15 ` Liam R. Howlett
2024-08-20 23:57 ` [PATCH v6 18/20] ipc/shm, mm: Drop do_vma_munmap() Liam R. Howlett
2024-08-21 11:59 ` Lorenzo Stoakes
2024-08-20 23:57 ` [PATCH v6 19/20] mm: Move may_expand_vm() check in mmap_region() Liam R. Howlett
2024-08-20 23:57 ` Liam R. Howlett [this message]
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