Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/mm/mincore.c |
| 3 | * |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 4 | * Copyright (C) 1994-2006 Linus Torvalds |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | /* |
| 8 | * The mincore() system call. |
| 9 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/pagemap.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 11 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/mm.h> |
| 13 | #include <linux/mman.h> |
| 14 | #include <linux/syscalls.h> |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 15 | #include <linux/swap.h> |
| 16 | #include <linux/swapops.h> |
Naoya Horiguchi | 4f16fc1 | 2009-12-14 17:59:58 -0800 | [diff] [blame] | 17 | #include <linux/hugetlb.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | #include <asm/uaccess.h> |
| 20 | #include <asm/pgtable.h> |
| 21 | |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 22 | static void mincore_hugetlb_page_range(struct vm_area_struct *vma, |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 23 | unsigned long addr, unsigned long end, |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 24 | unsigned char *vec) |
| 25 | { |
| 26 | #ifdef CONFIG_HUGETLB_PAGE |
| 27 | struct hstate *h; |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 28 | |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 29 | h = hstate_vma(vma); |
| 30 | while (1) { |
| 31 | unsigned char present; |
| 32 | pte_t *ptep; |
| 33 | /* |
| 34 | * Huge pages are always in RAM for now, but |
| 35 | * theoretically it needs to be checked. |
| 36 | */ |
| 37 | ptep = huge_pte_offset(current->mm, |
| 38 | addr & huge_page_mask(h)); |
| 39 | present = ptep && !huge_pte_none(huge_ptep_get(ptep)); |
| 40 | while (1) { |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 41 | *vec = present; |
| 42 | vec++; |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 43 | addr += PAGE_SIZE; |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 44 | if (addr == end) |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 45 | return; |
| 46 | /* check hugepage border */ |
| 47 | if (!(addr & ~huge_page_mask(h))) |
| 48 | break; |
| 49 | } |
| 50 | } |
| 51 | #else |
| 52 | BUG(); |
| 53 | #endif |
| 54 | } |
| 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | /* |
| 57 | * Later we can get more picky about what "in core" means precisely. |
| 58 | * For now, simply check to see if the page is in the page cache, |
| 59 | * and is up to date; i.e. that no page-in operation would be required |
| 60 | * at this time if an application were to map and access this page. |
| 61 | */ |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 62 | static unsigned char mincore_page(struct address_space *mapping, pgoff_t pgoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | { |
| 64 | unsigned char present = 0; |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 65 | struct page *page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 67 | /* |
| 68 | * When tmpfs swaps out a page from a file, any process mapping that |
| 69 | * file will not get a swp_entry_t in its pte, but rather it is like |
| 70 | * any other file mapping (ie. marked !present and faulted in with |
Nick Piggin | 3c18ddd | 2008-04-28 02:12:10 -0700 | [diff] [blame] | 71 | * tmpfs's .fault). So swapped out tmpfs mappings are tested here. |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 72 | * |
| 73 | * However when tmpfs moves the page from pagecache and into swapcache, |
| 74 | * it is still in core, but the find_get_page below won't find it. |
| 75 | * No big deal, but make a note of it. |
| 76 | */ |
| 77 | page = find_get_page(mapping, pgoff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | if (page) { |
| 79 | present = PageUptodate(page); |
| 80 | page_cache_release(page); |
| 81 | } |
| 82 | |
| 83 | return present; |
| 84 | } |
| 85 | |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 86 | static void mincore_unmapped_range(struct vm_area_struct *vma, |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 87 | unsigned long addr, unsigned long end, |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 88 | unsigned char *vec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 90 | unsigned long nr = (end - addr) >> PAGE_SHIFT; |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 91 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 93 | if (vma->vm_file) { |
| 94 | pgoff_t pgoff; |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 95 | |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 96 | pgoff = linear_page_index(vma, addr); |
| 97 | for (i = 0; i < nr; i++, pgoff++) |
| 98 | vec[i] = mincore_page(vma->vm_file->f_mapping, pgoff); |
| 99 | } else { |
| 100 | for (i = 0; i < nr; i++) |
| 101 | vec[i] = 0; |
Naoya Horiguchi | 4f16fc1 | 2009-12-14 17:59:58 -0800 | [diff] [blame] | 102 | } |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 103 | } |
Naoya Horiguchi | 4f16fc1 | 2009-12-14 17:59:58 -0800 | [diff] [blame] | 104 | |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 105 | static void mincore_pte_range(struct vm_area_struct *vma, pmd_t *pmd, |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 106 | unsigned long addr, unsigned long end, |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 107 | unsigned char *vec) |
| 108 | { |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 109 | unsigned long next; |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 110 | spinlock_t *ptl; |
| 111 | pte_t *ptep; |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 112 | |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 113 | ptep = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 114 | do { |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 115 | pte_t pte = *ptep; |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 116 | pgoff_t pgoff; |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 117 | |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 118 | next = addr + PAGE_SIZE; |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 119 | if (pte_none(pte)) |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 120 | mincore_unmapped_range(vma, addr, next, vec); |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 121 | else if (pte_present(pte)) |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 122 | *vec = 1; |
Johannes Weiner | 6a60f1b | 2010-05-24 14:32:09 -0700 | [diff] [blame] | 123 | else if (pte_file(pte)) { |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 124 | pgoff = pte_to_pgoff(pte); |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 125 | *vec = mincore_page(vma->vm_file->f_mapping, pgoff); |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 126 | } else { /* pte is a swap entry */ |
| 127 | swp_entry_t entry = pte_to_swp_entry(pte); |
Johannes Weiner | 6a60f1b | 2010-05-24 14:32:09 -0700 | [diff] [blame] | 128 | |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 129 | if (is_migration_entry(entry)) { |
| 130 | /* migration entries are always uptodate */ |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 131 | *vec = 1; |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 132 | } else { |
Nick Piggin | 30fcffe | 2007-02-14 12:35:02 +0100 | [diff] [blame] | 133 | #ifdef CONFIG_SWAP |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 134 | pgoff = entry.val; |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 135 | *vec = mincore_page(&swapper_space, pgoff); |
Nick Piggin | 30fcffe | 2007-02-14 12:35:02 +0100 | [diff] [blame] | 136 | #else |
| 137 | WARN_ON(1); |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 138 | *vec = 1; |
Nick Piggin | 30fcffe | 2007-02-14 12:35:02 +0100 | [diff] [blame] | 139 | #endif |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 140 | } |
| 141 | } |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 142 | vec++; |
| 143 | } while (ptep++, addr = next, addr != end); |
Johannes Weiner | 6a60f1b | 2010-05-24 14:32:09 -0700 | [diff] [blame] | 144 | pte_unmap_unlock(ptep - 1, ptl); |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 145 | } |
Nick Piggin | 42da9cb | 2007-02-12 00:51:39 -0800 | [diff] [blame] | 146 | |
Johannes Weiner | e48293f | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 147 | static void mincore_pmd_range(struct vm_area_struct *vma, pud_t *pud, |
| 148 | unsigned long addr, unsigned long end, |
| 149 | unsigned char *vec) |
| 150 | { |
| 151 | unsigned long next; |
| 152 | pmd_t *pmd; |
| 153 | |
| 154 | pmd = pmd_offset(pud, addr); |
| 155 | do { |
| 156 | next = pmd_addr_end(addr, end); |
Andrea Arcangeli | bae9c19 | 2011-01-13 15:46:46 -0800 | [diff] [blame^] | 157 | split_huge_page_pmd(vma->vm_mm, pmd); |
Johannes Weiner | e48293f | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 158 | if (pmd_none_or_clear_bad(pmd)) |
| 159 | mincore_unmapped_range(vma, addr, next, vec); |
| 160 | else |
| 161 | mincore_pte_range(vma, pmd, addr, next, vec); |
| 162 | vec += (next - addr) >> PAGE_SHIFT; |
| 163 | } while (pmd++, addr = next, addr != end); |
| 164 | } |
| 165 | |
| 166 | static void mincore_pud_range(struct vm_area_struct *vma, pgd_t *pgd, |
| 167 | unsigned long addr, unsigned long end, |
| 168 | unsigned char *vec) |
| 169 | { |
| 170 | unsigned long next; |
| 171 | pud_t *pud; |
| 172 | |
| 173 | pud = pud_offset(pgd, addr); |
| 174 | do { |
| 175 | next = pud_addr_end(addr, end); |
| 176 | if (pud_none_or_clear_bad(pud)) |
| 177 | mincore_unmapped_range(vma, addr, next, vec); |
| 178 | else |
| 179 | mincore_pmd_range(vma, pud, addr, next, vec); |
| 180 | vec += (next - addr) >> PAGE_SHIFT; |
| 181 | } while (pud++, addr = next, addr != end); |
| 182 | } |
| 183 | |
| 184 | static void mincore_page_range(struct vm_area_struct *vma, |
| 185 | unsigned long addr, unsigned long end, |
| 186 | unsigned char *vec) |
| 187 | { |
| 188 | unsigned long next; |
| 189 | pgd_t *pgd; |
| 190 | |
| 191 | pgd = pgd_offset(vma->vm_mm, addr); |
| 192 | do { |
| 193 | next = pgd_addr_end(addr, end); |
| 194 | if (pgd_none_or_clear_bad(pgd)) |
| 195 | mincore_unmapped_range(vma, addr, next, vec); |
| 196 | else |
| 197 | mincore_pud_range(vma, pgd, addr, next, vec); |
| 198 | vec += (next - addr) >> PAGE_SHIFT; |
| 199 | } while (pgd++, addr = next, addr != end); |
| 200 | } |
| 201 | |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 202 | /* |
| 203 | * Do a chunk of "sys_mincore()". We've already checked |
| 204 | * all the arguments, we hold the mmap semaphore: we should |
| 205 | * just return the amount of info we're asked for. |
| 206 | */ |
| 207 | static long do_mincore(unsigned long addr, unsigned long pages, unsigned char *vec) |
| 208 | { |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 209 | struct vm_area_struct *vma; |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 210 | unsigned long end; |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 211 | |
| 212 | vma = find_vma(current->mm, addr); |
| 213 | if (!vma || addr < vma->vm_start) |
| 214 | return -ENOMEM; |
| 215 | |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 216 | end = min(vma->vm_end, addr + (pages << PAGE_SHIFT)); |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 217 | |
| 218 | if (is_vm_hugetlb_page(vma)) { |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 219 | mincore_hugetlb_page_range(vma, addr, end, vec); |
| 220 | return (end - addr) >> PAGE_SHIFT; |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 221 | } |
| 222 | |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 223 | end = pmd_addr_end(addr, end); |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 224 | |
Johannes Weiner | e48293f | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 225 | if (is_vm_hugetlb_page(vma)) |
| 226 | mincore_hugetlb_page_range(vma, addr, end, vec); |
| 227 | else |
| 228 | mincore_page_range(vma, addr, end, vec); |
Johannes Weiner | f488401 | 2010-05-24 14:32:10 -0700 | [diff] [blame] | 229 | |
Johannes Weiner | 25ef0e5 | 2010-05-24 14:32:11 -0700 | [diff] [blame] | 230 | return (end - addr) >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | } |
| 232 | |
| 233 | /* |
| 234 | * The mincore(2) system call. |
| 235 | * |
| 236 | * mincore() returns the memory residency status of the pages in the |
| 237 | * current process's address space specified by [addr, addr + len). |
| 238 | * The status is returned in a vector of bytes. The least significant |
| 239 | * bit of each byte is 1 if the referenced page is in memory, otherwise |
| 240 | * it is zero. |
| 241 | * |
| 242 | * Because the status of a page can change after mincore() checks it |
| 243 | * but before it returns to the application, the returned vector may |
| 244 | * contain stale information. Only locked pages are guaranteed to |
| 245 | * remain in memory. |
| 246 | * |
| 247 | * return values: |
| 248 | * zero - success |
| 249 | * -EFAULT - vec points to an illegal address |
| 250 | * -EINVAL - addr is not a multiple of PAGE_CACHE_SIZE |
| 251 | * -ENOMEM - Addresses in the range [addr, addr + len] are |
| 252 | * invalid for the address space of this process, or |
| 253 | * specify one or more pages which are not currently |
| 254 | * mapped |
| 255 | * -EAGAIN - A kernel resource was temporarily unavailable. |
| 256 | */ |
Heiko Carstens | 3480b25 | 2009-01-14 14:14:16 +0100 | [diff] [blame] | 257 | SYSCALL_DEFINE3(mincore, unsigned long, start, size_t, len, |
| 258 | unsigned char __user *, vec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | { |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 260 | long retval; |
| 261 | unsigned long pages; |
| 262 | unsigned char *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 264 | /* Check the start address: needs to be page-aligned.. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | if (start & ~PAGE_CACHE_MASK) |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 266 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 268 | /* ..and we need to be passed a valid user-space range */ |
| 269 | if (!access_ok(VERIFY_READ, (void __user *) start, len)) |
| 270 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 272 | /* This also avoids any overflows on PAGE_CACHE_ALIGN */ |
| 273 | pages = len >> PAGE_SHIFT; |
| 274 | pages += (len & ~PAGE_MASK) != 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 276 | if (!access_ok(VERIFY_WRITE, vec, pages)) |
| 277 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 279 | tmp = (void *) __get_free_page(GFP_USER); |
| 280 | if (!tmp) |
Linus Torvalds | 4fb23e4 | 2006-12-16 16:01:50 -0800 | [diff] [blame] | 281 | return -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 283 | retval = 0; |
| 284 | while (pages) { |
| 285 | /* |
| 286 | * Do at most PAGE_SIZE entries per iteration, due to |
| 287 | * the temporary buffer size. |
| 288 | */ |
| 289 | down_read(¤t->mm->mmap_sem); |
Johannes Weiner | 6a60f1b | 2010-05-24 14:32:09 -0700 | [diff] [blame] | 290 | retval = do_mincore(start, min(pages, PAGE_SIZE), tmp); |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 291 | up_read(¤t->mm->mmap_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 293 | if (retval <= 0) |
| 294 | break; |
| 295 | if (copy_to_user(vec, tmp, retval)) { |
| 296 | retval = -EFAULT; |
| 297 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | } |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 299 | pages -= retval; |
| 300 | vec += retval; |
| 301 | start += retval << PAGE_SHIFT; |
| 302 | retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | } |
Linus Torvalds | 2f77d10 | 2006-12-16 09:44:32 -0800 | [diff] [blame] | 304 | free_page((unsigned long) tmp); |
| 305 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |