Message ID | 20230117023335.1690727-29-Liam.Howlett@oracle.com (mailing list archive) |
---|---|
State | New |
Headers | show
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Tue, 17 Jan 2023 02:34:23 +0000 Received: from SN6PR10MB3022.namprd10.prod.outlook.com ([fe80::a02:2ac8:ee3e:682]) by SN6PR10MB3022.namprd10.prod.outlook.com ([fe80::a02:2ac8:ee3e:682%4]) with mapi id 15.20.6002.012; Tue, 17 Jan 2023 02:34:23 +0000 From: Liam Howlett <liam.howlett@oracle.com> To: "linux-mm@kvack.org" <linux-mm@kvack.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@linux-foundation.org>, "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org> CC: Liam Howlett <liam.howlett@oracle.com> Subject: [PATCH v3 28/48] nommu: Pass through vma iterator to shrink_vma() Thread-Topic: [PATCH v3 28/48] nommu: Pass through vma iterator to shrink_vma() Thread-Index: AQHZKhwzvG/+hOM+tUqNzGWiXmLirQ== Date: Tue, 17 Jan 2023 02:34:18 +0000 Message-ID: <20230117023335.1690727-29-Liam.Howlett@oracle.com> References: <20230117023335.1690727-1-Liam.Howlett@oracle.com> In-Reply-To: <20230117023335.1690727-1-Liam.Howlett@oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.35.1 x-ms-publictraffictype: Email x-ms-traffictypediagnostic: SN6PR10MB3022:EE_|CO6PR10MB5538:EE_ x-ms-office365-filtering-correlation-id: 9b11ab40-1528-44fe-89e4-08daf8335841 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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Series |
VMA tree type safety and remove __vma_adjust()
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expand
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diff --git a/mm/nommu.c b/mm/nommu.c index 595f942c6101..f892af0a6ca3 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -560,44 +560,6 @@ static void setup_vma_to_mm(struct vm_area_struct *vma, struct mm_struct *mm) } } -/* - * vmi_add_vma_to_mm() - VMA Iterator variant of add_vmi_to_mm(). - * @vmi: The VMA iterator - * @mm: The mm_struct - * @vma: The vma to add - * - */ -static void vmi_add_vma_to_mm(struct vma_iterator *vmi, struct mm_struct *mm, - struct vm_area_struct *vma) -{ - BUG_ON(!vma->vm_region); - - setup_vma_to_mm(vma, mm); - mm->map_count++; - - /* add the VMA to the tree */ - vma_iter_store(vmi, vma); -} - -/* - * add a VMA into a process's mm_struct in the appropriate place in the list - * and tree and add to the address space's page tree also if not an anonymous - * page - * - should be called with mm->mmap_lock held writelocked - */ -static int add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma) -{ - VMA_ITERATOR(vmi, mm, vma->vm_start); - - if (vma_iter_prealloc(&vmi, vma)) { - pr_warn("Allocation of vma tree for process %d failed\n", - current->pid); - return -ENOMEM; - } - vmi_add_vma_to_mm(&vmi, mm, vma); - return 0; -} - static void cleanup_vma_from_mm(struct vm_area_struct *vma) { vma->vm_mm->map_count--; @@ -1211,7 +1173,11 @@ unsigned long do_mmap(struct file *file, current->mm->total_vm += len >> PAGE_SHIFT; share: - vmi_add_vma_to_mm(&vmi, current->mm, vma); + BUG_ON(!vma->vm_region); + setup_vma_to_mm(vma, current->mm); + current->mm->map_count++; + /* add the VMA to the tree */ + vma_iter_store(&vmi, vma); /* we flush the region from the icache only when the first executable * mapping of it is made */ @@ -1396,7 +1362,7 @@ int vmi_split_vma(struct vma_iterator *vmi, struct mm_struct *mm, * shrink a VMA by removing the specified chunk from either the beginning or * the end */ -static int shrink_vma(struct mm_struct *mm, +static int vmi_shrink_vma(struct vma_iterator *vmi, struct vm_area_struct *vma, unsigned long from, unsigned long to) { @@ -1404,14 +1370,19 @@ static int shrink_vma(struct mm_struct *mm, /* adjust the VMA's pointers, which may reposition it in the MM's tree * and list */ - if (delete_vma_from_mm(vma)) + if (vma_iter_prealloc(vmi, vma)) { + pr_warn("Allocation of vma tree for process %d failed\n", + current->pid); return -ENOMEM; - if (from > vma->vm_start) + } + + if (from > vma->vm_start) { + vma_iter_clear(vmi, from, vma->vm_end); vma->vm_end = from; - else + } else { + vma_iter_clear(vmi, vma->vm_start, to); vma->vm_start = to; - if (add_vma_to_mm(mm, vma)) - return -ENOMEM; + } /* cut the backing region down to size */ region = vma->vm_region; @@ -1488,7 +1459,7 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len, struct list if (ret < 0) return ret; } - return shrink_vma(mm, vma, start, end); + return vmi_shrink_vma(&vmi, vma, start, end); } erase_whole_vma: