Message ID | 20230117023335.1690727-12-Liam.Howlett@oracle.com (mailing list archive) |
---|---|
State | New |
Headers | show
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Tue, 17 Jan 2023 02:34:14 +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 02:34:14 +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>, Liam Howlett <liam.howlett@oracle.com> Subject: [PATCH v3 11/48] mm/mmap: Remove preallocation from do_mas_align_munmap() Thread-Topic: [PATCH v3 11/48] mm/mmap: Remove preallocation from do_mas_align_munmap() Thread-Index: AQHZKhwvQyq3wbkS0U6IuYR6K+N7/g== Date: Tue, 17 Jan 2023 02:34:13 +0000 Message-ID: <20230117023335.1690727-12-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_|CH0PR10MB5356:EE_ x-ms-office365-filtering-correlation-id: 911da601-7415-44a9-a50e-08daf83352f2 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/mmap.c b/mm/mmap.c index fc279b6784c9..1d18e8e219ff 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2325,9 +2325,6 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma, mt_init_flags(&mt_detach, MT_FLAGS_LOCK_EXTERN); mt_set_external_lock(&mt_detach, &mm->mmap_lock); - if (mas_preallocate(mas, vma, GFP_KERNEL)) - return -ENOMEM; - mas->last = end - 1; /* * If we need to split any vma, do it now to save pain later. @@ -2418,8 +2415,6 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma, goto userfaultfd_error; } - /* Point of no return */ - mas_set_range(mas, start, end - 1); #if defined(CONFIG_DEBUG_VM_MAPLE_TREE) /* Make sure no VMAs are about to be lost. */ { @@ -2427,6 +2422,7 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma, struct vm_area_struct *vma_mas, *vma_test; int test_count = 0; + mas_set_range(mas, start, end - 1); rcu_read_lock(); vma_test = mas_find(&test, end - 1); mas_for_each(mas, vma_mas, end - 1) { @@ -2436,10 +2432,13 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma, } rcu_read_unlock(); BUG_ON(count != test_count); - mas_set_range(mas, start, end - 1); } #endif - mas_store_prealloc(mas, NULL); + /* Point of no return */ + mas_set_range(mas, start, end - 1); + if (mas_store_gfp(mas, NULL, GFP_KERNEL)) + return -ENOMEM; + mm->map_count -= count; /* * Do not downgrade mmap_lock if we are next to VM_GROWSDOWN or @@ -2471,7 +2470,6 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma, __mt_destroy(&mt_detach); start_split_failed: map_count_exceeded: - mas_destroy(mas); return error; }