Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 1 | /* |
| 2 | * mm/percpu-vm.c - vmalloc area based chunk allocation |
| 3 | * |
| 4 | * Copyright (C) 2010 SUSE Linux Products GmbH |
| 5 | * Copyright (C) 2010 Tejun Heo <tj@kernel.org> |
| 6 | * |
| 7 | * This file is released under the GPLv2. |
| 8 | * |
| 9 | * Chunks are mapped into vmalloc areas and populated page by page. |
| 10 | * This is the default chunk allocator. |
| 11 | */ |
| 12 | |
| 13 | static struct page *pcpu_chunk_page(struct pcpu_chunk *chunk, |
| 14 | unsigned int cpu, int page_idx) |
| 15 | { |
| 16 | /* must not be used on pre-mapped chunk */ |
| 17 | WARN_ON(chunk->immutable); |
| 18 | |
| 19 | return vmalloc_to_page((void *)pcpu_chunk_addr(chunk, cpu, page_idx)); |
| 20 | } |
| 21 | |
| 22 | /** |
Tejun Heo | fbbb7f4 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 23 | * pcpu_get_pages - get temp pages array |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 24 | * @chunk: chunk of interest |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 25 | * |
Tejun Heo | fbbb7f4 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 26 | * Returns pointer to array of pointers to struct page which can be indexed |
Tejun Heo | cdb4cba | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 27 | * with pcpu_page_idx(). Note that there is only one array and accesses |
| 28 | * should be serialized by pcpu_alloc_mutex. |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 29 | * |
| 30 | * RETURNS: |
Tejun Heo | fbbb7f4 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 31 | * Pointer to temp pages array on success. |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 32 | */ |
Tejun Heo | cdb4cba | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 33 | static struct page **pcpu_get_pages(struct pcpu_chunk *chunk_alloc) |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 34 | { |
| 35 | static struct page **pages; |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 36 | size_t pages_size = pcpu_nr_units * pcpu_unit_pages * sizeof(pages[0]); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 37 | |
Tejun Heo | cdb4cba | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 38 | lockdep_assert_held(&pcpu_alloc_mutex); |
| 39 | |
| 40 | if (!pages) |
Tejun Heo | fbbb7f4 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 41 | pages = pcpu_mem_zalloc(pages_size); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 42 | return pages; |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * pcpu_free_pages - free pages which were allocated for @chunk |
| 47 | * @chunk: chunk pages were allocated for |
| 48 | * @pages: array of pages to be freed, indexed by pcpu_page_idx() |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 49 | * @page_start: page index of the first page to be freed |
| 50 | * @page_end: page index of the last page to be freed + 1 |
| 51 | * |
| 52 | * Free pages [@page_start and @page_end) in @pages for all units. |
| 53 | * The pages were allocated for @chunk. |
| 54 | */ |
| 55 | static void pcpu_free_pages(struct pcpu_chunk *chunk, |
Tejun Heo | fbbb7f4 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 56 | struct page **pages, int page_start, int page_end) |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 57 | { |
| 58 | unsigned int cpu; |
| 59 | int i; |
| 60 | |
| 61 | for_each_possible_cpu(cpu) { |
| 62 | for (i = page_start; i < page_end; i++) { |
| 63 | struct page *page = pages[pcpu_page_idx(cpu, i)]; |
| 64 | |
| 65 | if (page) |
| 66 | __free_page(page); |
| 67 | } |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * pcpu_alloc_pages - allocates pages for @chunk |
| 73 | * @chunk: target chunk |
| 74 | * @pages: array to put the allocated pages into, indexed by pcpu_page_idx() |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 75 | * @page_start: page index of the first page to be allocated |
| 76 | * @page_end: page index of the last page to be allocated + 1 |
| 77 | * |
| 78 | * Allocate pages [@page_start,@page_end) into @pages for all units. |
| 79 | * The allocation is for @chunk. Percpu core doesn't care about the |
| 80 | * content of @pages and will pass it verbatim to pcpu_map_pages(). |
| 81 | */ |
| 82 | static int pcpu_alloc_pages(struct pcpu_chunk *chunk, |
Tejun Heo | fbbb7f4 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 83 | struct page **pages, int page_start, int page_end) |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 84 | { |
| 85 | const gfp_t gfp = GFP_KERNEL | __GFP_HIGHMEM | __GFP_COLD; |
Tejun Heo | f0d2796 | 2014-08-15 16:06:06 -0400 | [diff] [blame] | 86 | unsigned int cpu, tcpu; |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 87 | int i; |
| 88 | |
| 89 | for_each_possible_cpu(cpu) { |
| 90 | for (i = page_start; i < page_end; i++) { |
| 91 | struct page **pagep = &pages[pcpu_page_idx(cpu, i)]; |
| 92 | |
| 93 | *pagep = alloc_pages_node(cpu_to_node(cpu), gfp, 0); |
Tejun Heo | f0d2796 | 2014-08-15 16:06:06 -0400 | [diff] [blame] | 94 | if (!*pagep) |
| 95 | goto err; |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 96 | } |
| 97 | } |
| 98 | return 0; |
Tejun Heo | f0d2796 | 2014-08-15 16:06:06 -0400 | [diff] [blame] | 99 | |
| 100 | err: |
| 101 | while (--i >= page_start) |
| 102 | __free_page(pages[pcpu_page_idx(cpu, i)]); |
| 103 | |
| 104 | for_each_possible_cpu(tcpu) { |
| 105 | if (tcpu == cpu) |
| 106 | break; |
| 107 | for (i = page_start; i < page_end; i++) |
| 108 | __free_page(pages[pcpu_page_idx(tcpu, i)]); |
| 109 | } |
| 110 | return -ENOMEM; |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | /** |
| 114 | * pcpu_pre_unmap_flush - flush cache prior to unmapping |
| 115 | * @chunk: chunk the regions to be flushed belongs to |
| 116 | * @page_start: page index of the first page to be flushed |
| 117 | * @page_end: page index of the last page to be flushed + 1 |
| 118 | * |
| 119 | * Pages in [@page_start,@page_end) of @chunk are about to be |
| 120 | * unmapped. Flush cache. As each flushing trial can be very |
| 121 | * expensive, issue flush on the whole region at once rather than |
| 122 | * doing it for each cpu. This could be an overkill but is more |
| 123 | * scalable. |
| 124 | */ |
| 125 | static void pcpu_pre_unmap_flush(struct pcpu_chunk *chunk, |
| 126 | int page_start, int page_end) |
| 127 | { |
| 128 | flush_cache_vunmap( |
Tejun Heo | a855b84 | 2011-11-18 10:55:35 -0800 | [diff] [blame] | 129 | pcpu_chunk_addr(chunk, pcpu_low_unit_cpu, page_start), |
| 130 | pcpu_chunk_addr(chunk, pcpu_high_unit_cpu, page_end)); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | static void __pcpu_unmap_pages(unsigned long addr, int nr_pages) |
| 134 | { |
| 135 | unmap_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT); |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * pcpu_unmap_pages - unmap pages out of a pcpu_chunk |
| 140 | * @chunk: chunk of interest |
| 141 | * @pages: pages array which can be used to pass information to free |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 142 | * @page_start: page index of the first page to unmap |
| 143 | * @page_end: page index of the last page to unmap + 1 |
| 144 | * |
| 145 | * For each cpu, unmap pages [@page_start,@page_end) out of @chunk. |
| 146 | * Corresponding elements in @pages were cleared by the caller and can |
| 147 | * be used to carry information to pcpu_free_pages() which will be |
| 148 | * called after all unmaps are finished. The caller should call |
| 149 | * proper pre/post flush functions. |
| 150 | */ |
| 151 | static void pcpu_unmap_pages(struct pcpu_chunk *chunk, |
Tejun Heo | fbbb7f4 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 152 | struct page **pages, int page_start, int page_end) |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 153 | { |
| 154 | unsigned int cpu; |
| 155 | int i; |
| 156 | |
| 157 | for_each_possible_cpu(cpu) { |
| 158 | for (i = page_start; i < page_end; i++) { |
| 159 | struct page *page; |
| 160 | |
| 161 | page = pcpu_chunk_page(chunk, cpu, i); |
| 162 | WARN_ON(!page); |
| 163 | pages[pcpu_page_idx(cpu, i)] = page; |
| 164 | } |
| 165 | __pcpu_unmap_pages(pcpu_chunk_addr(chunk, cpu, page_start), |
| 166 | page_end - page_start); |
| 167 | } |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | /** |
| 171 | * pcpu_post_unmap_tlb_flush - flush TLB after unmapping |
| 172 | * @chunk: pcpu_chunk the regions to be flushed belong to |
| 173 | * @page_start: page index of the first page to be flushed |
| 174 | * @page_end: page index of the last page to be flushed + 1 |
| 175 | * |
| 176 | * Pages [@page_start,@page_end) of @chunk have been unmapped. Flush |
| 177 | * TLB for the regions. This can be skipped if the area is to be |
| 178 | * returned to vmalloc as vmalloc will handle TLB flushing lazily. |
| 179 | * |
| 180 | * As with pcpu_pre_unmap_flush(), TLB flushing also is done at once |
| 181 | * for the whole region. |
| 182 | */ |
| 183 | static void pcpu_post_unmap_tlb_flush(struct pcpu_chunk *chunk, |
| 184 | int page_start, int page_end) |
| 185 | { |
| 186 | flush_tlb_kernel_range( |
Tejun Heo | a855b84 | 2011-11-18 10:55:35 -0800 | [diff] [blame] | 187 | pcpu_chunk_addr(chunk, pcpu_low_unit_cpu, page_start), |
| 188 | pcpu_chunk_addr(chunk, pcpu_high_unit_cpu, page_end)); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | static int __pcpu_map_pages(unsigned long addr, struct page **pages, |
| 192 | int nr_pages) |
| 193 | { |
| 194 | return map_kernel_range_noflush(addr, nr_pages << PAGE_SHIFT, |
| 195 | PAGE_KERNEL, pages); |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * pcpu_map_pages - map pages into a pcpu_chunk |
| 200 | * @chunk: chunk of interest |
| 201 | * @pages: pages array containing pages to be mapped |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 202 | * @page_start: page index of the first page to map |
| 203 | * @page_end: page index of the last page to map + 1 |
| 204 | * |
| 205 | * For each cpu, map pages [@page_start,@page_end) into @chunk. The |
| 206 | * caller is responsible for calling pcpu_post_map_flush() after all |
| 207 | * mappings are complete. |
| 208 | * |
Tejun Heo | fbbb7f4 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 209 | * This function is responsible for setting up whatever is necessary for |
| 210 | * reverse lookup (addr -> chunk). |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 211 | */ |
| 212 | static int pcpu_map_pages(struct pcpu_chunk *chunk, |
Tejun Heo | fbbb7f4 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 213 | struct page **pages, int page_start, int page_end) |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 214 | { |
| 215 | unsigned int cpu, tcpu; |
| 216 | int i, err; |
| 217 | |
| 218 | for_each_possible_cpu(cpu) { |
| 219 | err = __pcpu_map_pages(pcpu_chunk_addr(chunk, cpu, page_start), |
| 220 | &pages[pcpu_page_idx(cpu, page_start)], |
| 221 | page_end - page_start); |
| 222 | if (err < 0) |
| 223 | goto err; |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 224 | |
Tejun Heo | fbbb7f4 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 225 | for (i = page_start; i < page_end; i++) |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 226 | pcpu_set_page_chunk(pages[pcpu_page_idx(cpu, i)], |
| 227 | chunk); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 228 | } |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 229 | return 0; |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 230 | err: |
| 231 | for_each_possible_cpu(tcpu) { |
| 232 | if (tcpu == cpu) |
| 233 | break; |
| 234 | __pcpu_unmap_pages(pcpu_chunk_addr(chunk, tcpu, page_start), |
| 235 | page_end - page_start); |
| 236 | } |
Tejun Heo | 849f516 | 2014-08-15 16:06:10 -0400 | [diff] [blame] | 237 | pcpu_post_unmap_tlb_flush(chunk, page_start, page_end); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 238 | return err; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * pcpu_post_map_flush - flush cache after mapping |
| 243 | * @chunk: pcpu_chunk the regions to be flushed belong to |
| 244 | * @page_start: page index of the first page to be flushed |
| 245 | * @page_end: page index of the last page to be flushed + 1 |
| 246 | * |
| 247 | * Pages [@page_start,@page_end) of @chunk have been mapped. Flush |
| 248 | * cache. |
| 249 | * |
| 250 | * As with pcpu_pre_unmap_flush(), TLB flushing also is done at once |
| 251 | * for the whole region. |
| 252 | */ |
| 253 | static void pcpu_post_map_flush(struct pcpu_chunk *chunk, |
| 254 | int page_start, int page_end) |
| 255 | { |
| 256 | flush_cache_vmap( |
Tejun Heo | a855b84 | 2011-11-18 10:55:35 -0800 | [diff] [blame] | 257 | pcpu_chunk_addr(chunk, pcpu_low_unit_cpu, page_start), |
| 258 | pcpu_chunk_addr(chunk, pcpu_high_unit_cpu, page_end)); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 259 | } |
| 260 | |
| 261 | /** |
| 262 | * pcpu_populate_chunk - populate and map an area of a pcpu_chunk |
| 263 | * @chunk: chunk of interest |
Tejun Heo | a93ace48 | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 264 | * @page_start: the start page |
| 265 | * @page_end: the end page |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 266 | * |
| 267 | * For each cpu, populate and map pages [@page_start,@page_end) into |
Tejun Heo | dca4964 | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 268 | * @chunk. |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 269 | * |
| 270 | * CONTEXT: |
| 271 | * pcpu_alloc_mutex, does GFP_KERNEL allocation. |
| 272 | */ |
Tejun Heo | a93ace48 | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 273 | static int pcpu_populate_chunk(struct pcpu_chunk *chunk, |
| 274 | int page_start, int page_end) |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 275 | { |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 276 | struct page **pages; |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 277 | |
Tejun Heo | cdb4cba | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 278 | pages = pcpu_get_pages(chunk); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 279 | if (!pages) |
| 280 | return -ENOMEM; |
| 281 | |
Tejun Heo | a93ace48 | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 282 | if (pcpu_alloc_pages(chunk, pages, page_start, page_end)) |
| 283 | return -ENOMEM; |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 284 | |
Tejun Heo | a93ace48 | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 285 | if (pcpu_map_pages(chunk, pages, page_start, page_end)) { |
| 286 | pcpu_free_pages(chunk, pages, page_start, page_end); |
| 287 | return -ENOMEM; |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 288 | } |
| 289 | pcpu_post_map_flush(chunk, page_start, page_end); |
| 290 | |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 291 | return 0; |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | /** |
| 295 | * pcpu_depopulate_chunk - depopulate and unmap an area of a pcpu_chunk |
| 296 | * @chunk: chunk to depopulate |
Tejun Heo | a93ace48 | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 297 | * @page_start: the start page |
| 298 | * @page_end: the end page |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 299 | * |
| 300 | * For each cpu, depopulate and unmap pages [@page_start,@page_end) |
Tejun Heo | a93ace48 | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 301 | * from @chunk. |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 302 | * |
| 303 | * CONTEXT: |
| 304 | * pcpu_alloc_mutex. |
| 305 | */ |
Tejun Heo | a93ace48 | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 306 | static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, |
| 307 | int page_start, int page_end) |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 308 | { |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 309 | struct page **pages; |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 310 | |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 311 | /* |
| 312 | * If control reaches here, there must have been at least one |
| 313 | * successful population attempt so the temp pages array must |
| 314 | * be available now. |
| 315 | */ |
Tejun Heo | cdb4cba | 2014-09-02 14:46:01 -0400 | [diff] [blame] | 316 | pages = pcpu_get_pages(chunk); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 317 | BUG_ON(!pages); |
| 318 | |
| 319 | /* unmap and free */ |
| 320 | pcpu_pre_unmap_flush(chunk, page_start, page_end); |
| 321 | |
Tejun Heo | a93ace48 | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 322 | pcpu_unmap_pages(chunk, pages, page_start, page_end); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 323 | |
| 324 | /* no need to flush tlb, vmalloc will handle it lazily */ |
| 325 | |
Tejun Heo | a93ace48 | 2014-09-02 14:46:02 -0400 | [diff] [blame] | 326 | pcpu_free_pages(chunk, pages, page_start, page_end); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 327 | } |
| 328 | |
| 329 | static struct pcpu_chunk *pcpu_create_chunk(void) |
| 330 | { |
| 331 | struct pcpu_chunk *chunk; |
| 332 | struct vm_struct **vms; |
| 333 | |
| 334 | chunk = pcpu_alloc_chunk(); |
| 335 | if (!chunk) |
| 336 | return NULL; |
| 337 | |
| 338 | vms = pcpu_get_vm_areas(pcpu_group_offsets, pcpu_group_sizes, |
David Rientjes | ec3f64f | 2011-01-13 15:46:01 -0800 | [diff] [blame] | 339 | pcpu_nr_groups, pcpu_atom_size); |
Tejun Heo | 9f64553 | 2010-04-09 18:57:01 +0900 | [diff] [blame] | 340 | if (!vms) { |
| 341 | pcpu_free_chunk(chunk); |
| 342 | return NULL; |
| 343 | } |
| 344 | |
| 345 | chunk->data = vms; |
| 346 | chunk->base_addr = vms[0]->addr - pcpu_group_offsets[0]; |
| 347 | return chunk; |
| 348 | } |
| 349 | |
| 350 | static void pcpu_destroy_chunk(struct pcpu_chunk *chunk) |
| 351 | { |
| 352 | if (chunk && chunk->data) |
| 353 | pcpu_free_vm_areas(chunk->data, pcpu_nr_groups); |
| 354 | pcpu_free_chunk(chunk); |
| 355 | } |
| 356 | |
| 357 | static struct page *pcpu_addr_to_page(void *addr) |
| 358 | { |
| 359 | return vmalloc_to_page(addr); |
| 360 | } |
| 361 | |
| 362 | static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai) |
| 363 | { |
| 364 | /* no extra restriction */ |
| 365 | return 0; |
| 366 | } |