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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 v7 20/21] mm/vma: Drop incorrect comment from vms_gather_munmap_vmas()
Date: Thu, 22 Aug 2024 15:25:42 -0400	[thread overview]
Message-ID: <20240822192543.3359552-21-Liam.Howlett@oracle.com> (raw)
In-Reply-To: <20240822192543.3359552-1-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The comment has been outdated since 6b73cff239e52 ("mm: change munmap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 61d51677eaaf..ca87d30cb185 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -755,13 +755,8 @@ 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



  parent reply	other threads:[~2024-08-22 19:27 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-08-22 19:25 [PATCH v7 00/21] Avoid MAP_FIXED gap exposure Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 01/21] mm/vma: Correctly position vma_iterator in __split_vma() Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 02/21] mm/vma: Introduce abort_munmap_vmas() Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 03/21] mm/vma: Introduce vmi_complete_munmap_vmas() Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 04/21] mm/vma: Extract the gathering of vmas from do_vmi_align_munmap() Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 05/21] mm/vma: Introduce vma_munmap_struct for use in munmap operations Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 06/21] mm/vma: Change munmap to use vma_munmap_struct() for accounting and surrounding vmas Liam R. Howlett
2024-08-23  8:43   ` Bert Karwatzki
2024-08-23  9:55     ` Lorenzo Stoakes
2024-08-23 10:42       ` Bert Karwatzki
2024-08-23 11:39         ` Lorenzo Stoakes
2024-08-23 11:37     ` Lorenzo Stoakes
2024-08-23 13:30   ` [PATCH] mm/vma: fix bookkeeping checks Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 07/21] mm/vma: Extract validate_mm() from vma_complete() Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 08/21] mm/vma: Inline munmap operation in mmap_region() Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 09/21] mm/vma: Expand mmap_region() munmap call Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 10/21] mm/vma: Support vma == NULL in init_vma_munmap() Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 11/21] mm/mmap: Reposition vma iterator in mmap_region() Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 12/21] mm/vma: Track start and end for munmap in vma_munmap_struct Liam R. Howlett
2024-08-26 14:01   ` Geert Uytterhoeven
2024-08-26 14:12     ` Lorenzo Stoakes
2024-08-22 19:25 ` [PATCH v7 13/21] mm: Clean up unmap_region() argument list Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 14/21] mm/mmap: Avoid zeroing vma tree in mmap_region() Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 15/21] mm: Change failure of MAP_FIXED to restoring the gap on failure Liam R. Howlett
2024-08-27 17:15   ` [PATCH] mm/vma: Fix null pointer dereference in vms_abort_munmap_vmas() Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 16/21] mm/mmap: Use PHYS_PFN in mmap_region() Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 17/21] mm/mmap: Use vms accounted pages " Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 18/21] ipc/shm, mm: Drop do_vma_munmap() Liam R. Howlett
2024-08-22 19:25 ` [PATCH v7 19/21] mm: Move may_expand_vm() check in mmap_region() Liam R. Howlett
2024-08-22 19:25 ` Liam R. Howlett [this message]
2024-08-22 19:25 ` [PATCH v7 21/21] mm/vma.h: Optimise vma_munmap_struct Liam R. Howlett
2024-08-22 19:41   ` Lorenzo Stoakes

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