disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/mm/mincore.c
..
..
@@ -10,16 +10,16 @@
10
10
  */
11
11
 #include <linux/pagemap.h>
12
12
 #include <linux/gfp.h>
13
-#include <linux/mm.h>
13
+#include <linux/pagewalk.h>
14
14
 #include <linux/mman.h>
15
15
 #include <linux/syscalls.h>
16
16
 #include <linux/swap.h>
17
17
 #include <linux/swapops.h>
18
18
 #include <linux/shmem_fs.h>
19
19
 #include <linux/hugetlb.h>
20
+#include <linux/pgtable.h>
20
21
 
21
22
 #include <linux/uaccess.h>
22
-#include <asm/pgtable.h>
23
23
 
24
24
 static int mincore_hugetlb(pte_t *pte, unsigned long hmask, unsigned long addr,
25
25
 			unsigned long end, struct mm_walk *walk)
..
..
@@ -48,7 +48,7 @@
48
48
  * and is up to date; i.e. that no page-in operation would be required
49
49
  * at this time if an application were to map and access this page.
50
50
  */
51
-static unsigned char mincore_page(struct address_space *mapping, pgoff_t pgoff)
51
+static unsigned char mincore_page(struct address_space *mapping, pgoff_t index)
52
52
 {
53
53
 	unsigned char present = 0;
54
54
 	struct page *page;
..
..
@@ -59,23 +59,7 @@
59
59
 	 * any other file mapping (ie. marked !present and faulted in with
60
60
 	 * tmpfs's .fault). So swapped out tmpfs mappings are tested here.
61
61
 	 */
62
-#ifdef CONFIG_SWAP
63
-	if (shmem_mapping(mapping)) {
64
-		page = find_get_entry(mapping, pgoff);
65
-		/*
66
-		 * shmem/tmpfs may return swap: account for swapcache
67
-		 * page too.
68
-		 */
69
-		if (radix_tree_exceptional_entry(page)) {
70
-			swp_entry_t swp = radix_to_swp_entry(page);
71
-			page = find_get_page(swap_address_space(swp),
72
-					     swp_offset(swp));
73
-		}
74
-	} else
75
-		page = find_get_page(mapping, pgoff);
76
-#else
77
-	page = find_get_page(mapping, pgoff);
78
-#endif
62
+	page = find_get_incore_page(mapping, index);
79
63
 	if (page) {
80
64
 		present = PageUptodate(page);
81
65
 		put_page(page);
..
..
@@ -104,6 +88,7 @@
104
88
 }
105
89
 
106
90
 static int mincore_unmapped_range(unsigned long addr, unsigned long end,
91
+				   __always_unused int depth,
107
92
 				   struct mm_walk *walk)
108
93
 {
109
94
 	walk->private += __mincore_unmapped_range(addr, end,
..
..
@@ -185,6 +170,12 @@
185
170
 		inode_permission(file_inode(vma->vm_file), MAY_WRITE) == 0;
186
171
 }
187
172
 
173
+static const struct mm_walk_ops mincore_walk_ops = {
174
+	.pmd_entry		= mincore_pte_range,
175
+	.pte_hole		= mincore_unmapped_range,
176
+	.hugetlb_entry		= mincore_hugetlb,
177
+};
178
+
188
179
 /*
189
180
  * Do a chunk of "sys_mincore()". We've already checked
190
181
  * all the arguments, we hold the mmap semaphore: we should
..
..
@@ -195,12 +186,6 @@
195
186
 	struct vm_area_struct *vma;
196
187
 	unsigned long end;
197
188
 	int err;
198
-	struct mm_walk mincore_walk = {
199
-		.pmd_entry = mincore_pte_range,
200
-		.pte_hole = mincore_unmapped_range,
201
-		.hugetlb_entry = mincore_hugetlb,
202
-		.private = vec,
203
-	};
204
189
 
205
190
 	vma = find_vma(current->mm, addr);
206
191
 	if (!vma || addr < vma->vm_start)
..
..
@@ -211,8 +196,7 @@
211
196
 		memset(vec, 1, pages);
212
197
 		return pages;
213
198
 	}
214
-	mincore_walk.mm = vma->vm_mm;
215
-	err = walk_page_range(addr, end, &mincore_walk);
199
+	err = walk_page_range(vma->vm_mm, addr, end, &mincore_walk_ops, vec);
216
200
 	if (err < 0)
217
201
 		return err;
218
202
 	return (end - addr) >> PAGE_SHIFT;
..
..
@@ -256,14 +240,14 @@
256
240
 		return -EINVAL;
257
241
 
258
242
 	/* ..and we need to be passed a valid user-space range */
259
-	if (!access_ok(VERIFY_READ, (void __user *) start, len))
243
+	if (!access_ok((void __user *) start, len))
260
244
 		return -ENOMEM;
261
245
 
262
246
 	/* This also avoids any overflows on PAGE_ALIGN */
263
247
 	pages = len >> PAGE_SHIFT;
264
248
 	pages += (offset_in_page(len)) != 0;
265
249
 
266
-	if (!access_ok(VERIFY_WRITE, vec, pages))
250
+	if (!access_ok(vec, pages))
267
251
 		return -EFAULT;
268
252
 
269
253
 	tmp = (void *) __get_free_page(GFP_USER);
..
..
@@ -276,9 +260,9 @@
276
260
 		 * Do at most PAGE_SIZE entries per iteration, due to
277
261
 		 * the temporary buffer size.
278
262
 		 */
279
-		down_read(&current->mm->mmap_sem);
263
+		mmap_read_lock(current->mm);
280
264
 		retval = do_mincore(start, min(pages, PAGE_SIZE), tmp);
281
-		up_read(&current->mm->mmap_sem);
265
+		mmap_read_unlock(current->mm);
282
266
 
283
267
 		if (retval <= 0)
284
268
 			break;