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Howlett" To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton , maple-tree@lists.infradead.org Cc: "Liam R. Howlett" , "Liam R . Howlett" Subject: [PATCH v4 20/49] mempolicy: Convert to vma iterator Date: Fri, 20 Jan 2023 11:26:21 -0500 Message-Id: <20230120162650.984577-21-Liam.Howlett@oracle.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230120162650.984577-1-Liam.Howlett@oracle.com> References: <20230120162650.984577-1-Liam.Howlett@oracle.com> X-ClientProxiedBy: YT2PR01CA0022.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:38::27) To SN6PR10MB3022.namprd10.prod.outlook.com (2603:10b6:805:d8::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN6PR10MB3022:EE_|SN7PR10MB6619:EE_ X-MS-Office365-Filtering-Correlation-Id: cf7538ea-4cd3-493f-347e-08dafb034c52 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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Howlett" Use the vma iterator so that the iterator can be invalidated or updated to avoid each caller doing so. Signed-off-by: Liam R. Howlett --- mm/mempolicy.c | 25 ++++++++----------------- 1 file changed, 8 insertions(+), 17 deletions(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index fd99d303e34f..f5201285c628 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -786,24 +786,21 @@ static int vma_replace_policy(struct vm_area_struct *vma, static int mbind_range(struct mm_struct *mm, unsigned long start, unsigned long end, struct mempolicy *new_pol) { - MA_STATE(mas, &mm->mm_mt, start, start); + VMA_ITERATOR(vmi, mm, start); struct vm_area_struct *prev; struct vm_area_struct *vma; int err = 0; pgoff_t pgoff; - prev = mas_prev(&mas, 0); - if (unlikely(!prev)) - mas_set(&mas, start); - - vma = mas_find(&mas, end - 1); + prev = vma_prev(&vmi); + vma = vma_find(&vmi, end); if (WARN_ON(!vma)) return 0; if (start > vma->vm_start) prev = vma; - for (; vma; vma = mas_next(&mas, end - 1)) { + do { unsigned long vmstart = max(start, vma->vm_start); unsigned long vmend = min(end, vma->vm_end); @@ -812,29 +809,23 @@ static int mbind_range(struct mm_struct *mm, unsigned long start, pgoff = vma->vm_pgoff + ((vmstart - vma->vm_start) >> PAGE_SHIFT); - prev = vma_merge(mm, prev, vmstart, vmend, vma->vm_flags, + prev = vmi_vma_merge(&vmi, mm, prev, vmstart, vmend, vma->vm_flags, vma->anon_vma, vma->vm_file, pgoff, new_pol, vma->vm_userfaultfd_ctx, anon_vma_name(vma)); if (prev) { - /* vma_merge() invalidated the mas */ - mas_pause(&mas); vma = prev; goto replace; } if (vma->vm_start != vmstart) { - err = split_vma(vma->vm_mm, vma, vmstart, 1); + err = vmi_split_vma(&vmi, vma->vm_mm, vma, vmstart, 1); if (err) goto out; - /* split_vma() invalidated the mas */ - mas_pause(&mas); } if (vma->vm_end != vmend) { - err = split_vma(vma->vm_mm, vma, vmend, 0); + err = vmi_split_vma(&vmi, vma->vm_mm, vma, vmend, 0); if (err) goto out; - /* split_vma() invalidated the mas */ - mas_pause(&mas); } replace: err = vma_replace_policy(vma, new_pol); @@ -842,7 +833,7 @@ static int mbind_range(struct mm_struct *mm, unsigned long start, goto out; next: prev = vma; - } + } for_each_vma_range(vmi, vma, end); out: return err;