| 1 | /* |
| 2 | * Based on arch/arm/mm/init.c |
| 3 | * |
| 4 | * Copyright (C) 1995-2005 Russell King |
| 5 | * Copyright (C) 2012 ARM Ltd. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/export.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/swap.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/bootmem.h> |
| 26 | #include <linux/mman.h> |
| 27 | #include <linux/nodemask.h> |
| 28 | #include <linux/initrd.h> |
| 29 | #include <linux/gfp.h> |
| 30 | #include <linux/memblock.h> |
| 31 | #include <linux/sort.h> |
| 32 | #include <linux/of_fdt.h> |
| 33 | #include <linux/dma-mapping.h> |
| 34 | #include <linux/dma-contiguous.h> |
| 35 | #include <linux/efi.h> |
| 36 | #include <linux/swiotlb.h> |
| 37 | |
| 38 | #include <asm/boot.h> |
| 39 | #include <asm/fixmap.h> |
| 40 | #include <asm/kasan.h> |
| 41 | #include <asm/kernel-pgtable.h> |
| 42 | #include <asm/memory.h> |
| 43 | #include <asm/numa.h> |
| 44 | #include <asm/sections.h> |
| 45 | #include <asm/setup.h> |
| 46 | #include <asm/sizes.h> |
| 47 | #include <asm/tlb.h> |
| 48 | #include <asm/alternative.h> |
| 49 | |
| 50 | #include "mm.h" |
| 51 | |
| 52 | /* |
| 53 | * We need to be able to catch inadvertent references to memstart_addr |
| 54 | * that occur (potentially in generic code) before arm64_memblock_init() |
| 55 | * executes, which assigns it its actual value. So use a default value |
| 56 | * that cannot be mistaken for a real physical address. |
| 57 | */ |
| 58 | s64 memstart_addr __read_mostly = -1; |
| 59 | phys_addr_t arm64_dma_phys_limit __read_mostly; |
| 60 | |
| 61 | #ifdef CONFIG_BLK_DEV_INITRD |
| 62 | static int __init early_initrd(char *p) |
| 63 | { |
| 64 | unsigned long start, size; |
| 65 | char *endp; |
| 66 | |
| 67 | start = memparse(p, &endp); |
| 68 | if (*endp == ',') { |
| 69 | size = memparse(endp + 1, NULL); |
| 70 | |
| 71 | initrd_start = start; |
| 72 | initrd_end = start + size; |
| 73 | } |
| 74 | return 0; |
| 75 | } |
| 76 | early_param("initrd", early_initrd); |
| 77 | #endif |
| 78 | |
| 79 | /* |
| 80 | * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It |
| 81 | * currently assumes that for memory starting above 4G, 32-bit devices will |
| 82 | * use a DMA offset. |
| 83 | */ |
| 84 | static phys_addr_t __init max_zone_dma_phys(void) |
| 85 | { |
| 86 | phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32); |
| 87 | return min(offset + (1ULL << 32), memblock_end_of_DRAM()); |
| 88 | } |
| 89 | |
| 90 | #ifdef CONFIG_NUMA |
| 91 | |
| 92 | static void __init zone_sizes_init(unsigned long min, unsigned long max) |
| 93 | { |
| 94 | unsigned long max_zone_pfns[MAX_NR_ZONES] = {0}; |
| 95 | |
| 96 | if (IS_ENABLED(CONFIG_ZONE_DMA)) |
| 97 | max_zone_pfns[ZONE_DMA] = PFN_DOWN(max_zone_dma_phys()); |
| 98 | max_zone_pfns[ZONE_NORMAL] = max; |
| 99 | |
| 100 | free_area_init_nodes(max_zone_pfns); |
| 101 | } |
| 102 | |
| 103 | #else |
| 104 | |
| 105 | static void __init zone_sizes_init(unsigned long min, unsigned long max) |
| 106 | { |
| 107 | struct memblock_region *reg; |
| 108 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
| 109 | unsigned long max_dma = min; |
| 110 | |
| 111 | memset(zone_size, 0, sizeof(zone_size)); |
| 112 | |
| 113 | /* 4GB maximum for 32-bit only capable devices */ |
| 114 | #ifdef CONFIG_ZONE_DMA |
| 115 | max_dma = PFN_DOWN(arm64_dma_phys_limit); |
| 116 | zone_size[ZONE_DMA] = max_dma - min; |
| 117 | #endif |
| 118 | zone_size[ZONE_NORMAL] = max - max_dma; |
| 119 | |
| 120 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
| 121 | |
| 122 | for_each_memblock(memory, reg) { |
| 123 | unsigned long start = memblock_region_memory_base_pfn(reg); |
| 124 | unsigned long end = memblock_region_memory_end_pfn(reg); |
| 125 | |
| 126 | if (start >= max) |
| 127 | continue; |
| 128 | |
| 129 | #ifdef CONFIG_ZONE_DMA |
| 130 | if (start < max_dma) { |
| 131 | unsigned long dma_end = min(end, max_dma); |
| 132 | zhole_size[ZONE_DMA] -= dma_end - start; |
| 133 | } |
| 134 | #endif |
| 135 | if (end > max_dma) { |
| 136 | unsigned long normal_end = min(end, max); |
| 137 | unsigned long normal_start = max(start, max_dma); |
| 138 | zhole_size[ZONE_NORMAL] -= normal_end - normal_start; |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | free_area_init_node(0, zone_size, min, zhole_size); |
| 143 | } |
| 144 | |
| 145 | #endif /* CONFIG_NUMA */ |
| 146 | |
| 147 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
| 148 | int pfn_valid(unsigned long pfn) |
| 149 | { |
| 150 | return memblock_is_map_memory(pfn << PAGE_SHIFT); |
| 151 | } |
| 152 | EXPORT_SYMBOL(pfn_valid); |
| 153 | #endif |
| 154 | |
| 155 | #ifndef CONFIG_SPARSEMEM |
| 156 | static void __init arm64_memory_present(void) |
| 157 | { |
| 158 | } |
| 159 | #else |
| 160 | static void __init arm64_memory_present(void) |
| 161 | { |
| 162 | struct memblock_region *reg; |
| 163 | int nid = 0; |
| 164 | |
| 165 | for_each_memblock(memory, reg) { |
| 166 | #ifdef CONFIG_NUMA |
| 167 | nid = reg->nid; |
| 168 | #endif |
| 169 | memory_present(nid, memblock_region_memory_base_pfn(reg), |
| 170 | memblock_region_memory_end_pfn(reg)); |
| 171 | } |
| 172 | } |
| 173 | #endif |
| 174 | |
| 175 | static phys_addr_t memory_limit = (phys_addr_t)ULLONG_MAX; |
| 176 | |
| 177 | /* |
| 178 | * Limit the memory size that was specified via FDT. |
| 179 | */ |
| 180 | static int __init early_mem(char *p) |
| 181 | { |
| 182 | if (!p) |
| 183 | return 1; |
| 184 | |
| 185 | memory_limit = memparse(p, &p) & PAGE_MASK; |
| 186 | pr_notice("Memory limited to %lldMB\n", memory_limit >> 20); |
| 187 | |
| 188 | return 0; |
| 189 | } |
| 190 | early_param("mem", early_mem); |
| 191 | |
| 192 | void __init arm64_memblock_init(void) |
| 193 | { |
| 194 | const s64 linear_region_size = -(s64)PAGE_OFFSET; |
| 195 | |
| 196 | /* |
| 197 | * Ensure that the linear region takes up exactly half of the kernel |
| 198 | * virtual address space. This way, we can distinguish a linear address |
| 199 | * from a kernel/module/vmalloc address by testing a single bit. |
| 200 | */ |
| 201 | BUILD_BUG_ON(linear_region_size != BIT(VA_BITS - 1)); |
| 202 | |
| 203 | /* |
| 204 | * Select a suitable value for the base of physical memory. |
| 205 | */ |
| 206 | memstart_addr = round_down(memblock_start_of_DRAM(), |
| 207 | ARM64_MEMSTART_ALIGN); |
| 208 | |
| 209 | /* |
| 210 | * Remove the memory that we will not be able to cover with the |
| 211 | * linear mapping. Take care not to clip the kernel which may be |
| 212 | * high in memory. |
| 213 | */ |
| 214 | memblock_remove(max_t(u64, memstart_addr + linear_region_size, __pa(_end)), |
| 215 | ULLONG_MAX); |
| 216 | if (memstart_addr + linear_region_size < memblock_end_of_DRAM()) { |
| 217 | /* ensure that memstart_addr remains sufficiently aligned */ |
| 218 | memstart_addr = round_up(memblock_end_of_DRAM() - linear_region_size, |
| 219 | ARM64_MEMSTART_ALIGN); |
| 220 | memblock_remove(0, memstart_addr); |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * Apply the memory limit if it was set. Since the kernel may be loaded |
| 225 | * high up in memory, add back the kernel region that must be accessible |
| 226 | * via the linear mapping. |
| 227 | */ |
| 228 | if (memory_limit != (phys_addr_t)ULLONG_MAX) { |
| 229 | memblock_enforce_memory_limit(memory_limit); |
| 230 | memblock_add(__pa(_text), (u64)(_end - _text)); |
| 231 | } |
| 232 | |
| 233 | if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && initrd_start) { |
| 234 | /* |
| 235 | * Add back the memory we just removed if it results in the |
| 236 | * initrd to become inaccessible via the linear mapping. |
| 237 | * Otherwise, this is a no-op |
| 238 | */ |
| 239 | u64 base = initrd_start & PAGE_MASK; |
| 240 | u64 size = PAGE_ALIGN(initrd_end) - base; |
| 241 | |
| 242 | /* |
| 243 | * We can only add back the initrd memory if we don't end up |
| 244 | * with more memory than we can address via the linear mapping. |
| 245 | * It is up to the bootloader to position the kernel and the |
| 246 | * initrd reasonably close to each other (i.e., within 32 GB of |
| 247 | * each other) so that all granule/#levels combinations can |
| 248 | * always access both. |
| 249 | */ |
| 250 | if (WARN(base < memblock_start_of_DRAM() || |
| 251 | base + size > memblock_start_of_DRAM() + |
| 252 | linear_region_size, |
| 253 | "initrd not fully accessible via the linear mapping -- please check your bootloader ...\n")) { |
| 254 | initrd_start = 0; |
| 255 | } else { |
| 256 | memblock_remove(base, size); /* clear MEMBLOCK_ flags */ |
| 257 | memblock_add(base, size); |
| 258 | memblock_reserve(base, size); |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) { |
| 263 | extern u16 memstart_offset_seed; |
| 264 | u64 range = linear_region_size - |
| 265 | (memblock_end_of_DRAM() - memblock_start_of_DRAM()); |
| 266 | |
| 267 | /* |
| 268 | * If the size of the linear region exceeds, by a sufficient |
| 269 | * margin, the size of the region that the available physical |
| 270 | * memory spans, randomize the linear region as well. |
| 271 | */ |
| 272 | if (memstart_offset_seed > 0 && range >= ARM64_MEMSTART_ALIGN) { |
| 273 | range = range / ARM64_MEMSTART_ALIGN + 1; |
| 274 | memstart_addr -= ARM64_MEMSTART_ALIGN * |
| 275 | ((range * memstart_offset_seed) >> 16); |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | /* |
| 280 | * Register the kernel text, kernel data, initrd, and initial |
| 281 | * pagetables with memblock. |
| 282 | */ |
| 283 | memblock_reserve(__pa(_text), _end - _text); |
| 284 | #ifdef CONFIG_BLK_DEV_INITRD |
| 285 | if (initrd_start) { |
| 286 | memblock_reserve(initrd_start, initrd_end - initrd_start); |
| 287 | |
| 288 | /* the generic initrd code expects virtual addresses */ |
| 289 | initrd_start = __phys_to_virt(initrd_start); |
| 290 | initrd_end = __phys_to_virt(initrd_end); |
| 291 | } |
| 292 | #endif |
| 293 | |
| 294 | early_init_fdt_scan_reserved_mem(); |
| 295 | |
| 296 | /* 4GB maximum for 32-bit only capable devices */ |
| 297 | if (IS_ENABLED(CONFIG_ZONE_DMA)) |
| 298 | arm64_dma_phys_limit = max_zone_dma_phys(); |
| 299 | else |
| 300 | arm64_dma_phys_limit = PHYS_MASK + 1; |
| 301 | dma_contiguous_reserve(arm64_dma_phys_limit); |
| 302 | |
| 303 | memblock_allow_resize(); |
| 304 | } |
| 305 | |
| 306 | void __init bootmem_init(void) |
| 307 | { |
| 308 | unsigned long min, max; |
| 309 | |
| 310 | min = PFN_UP(memblock_start_of_DRAM()); |
| 311 | max = PFN_DOWN(memblock_end_of_DRAM()); |
| 312 | |
| 313 | early_memtest(min << PAGE_SHIFT, max << PAGE_SHIFT); |
| 314 | |
| 315 | max_pfn = max_low_pfn = max; |
| 316 | |
| 317 | arm64_numa_init(); |
| 318 | /* |
| 319 | * Sparsemem tries to allocate bootmem in memory_present(), so must be |
| 320 | * done after the fixed reservations. |
| 321 | */ |
| 322 | arm64_memory_present(); |
| 323 | |
| 324 | sparse_init(); |
| 325 | zone_sizes_init(min, max); |
| 326 | |
| 327 | high_memory = __va((max << PAGE_SHIFT) - 1) + 1; |
| 328 | memblock_dump_all(); |
| 329 | } |
| 330 | |
| 331 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
| 332 | static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
| 333 | { |
| 334 | struct page *start_pg, *end_pg; |
| 335 | unsigned long pg, pgend; |
| 336 | |
| 337 | /* |
| 338 | * Convert start_pfn/end_pfn to a struct page pointer. |
| 339 | */ |
| 340 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
| 341 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
| 342 | |
| 343 | /* |
| 344 | * Convert to physical addresses, and round start upwards and end |
| 345 | * downwards. |
| 346 | */ |
| 347 | pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); |
| 348 | pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; |
| 349 | |
| 350 | /* |
| 351 | * If there are free pages between these, free the section of the |
| 352 | * memmap array. |
| 353 | */ |
| 354 | if (pg < pgend) |
| 355 | free_bootmem(pg, pgend - pg); |
| 356 | } |
| 357 | |
| 358 | /* |
| 359 | * The mem_map array can get very big. Free the unused area of the memory map. |
| 360 | */ |
| 361 | static void __init free_unused_memmap(void) |
| 362 | { |
| 363 | unsigned long start, prev_end = 0; |
| 364 | struct memblock_region *reg; |
| 365 | |
| 366 | for_each_memblock(memory, reg) { |
| 367 | start = __phys_to_pfn(reg->base); |
| 368 | |
| 369 | #ifdef CONFIG_SPARSEMEM |
| 370 | /* |
| 371 | * Take care not to free memmap entries that don't exist due |
| 372 | * to SPARSEMEM sections which aren't present. |
| 373 | */ |
| 374 | start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); |
| 375 | #endif |
| 376 | /* |
| 377 | * If we had a previous bank, and there is a space between the |
| 378 | * current bank and the previous, free it. |
| 379 | */ |
| 380 | if (prev_end && prev_end < start) |
| 381 | free_memmap(prev_end, start); |
| 382 | |
| 383 | /* |
| 384 | * Align up here since the VM subsystem insists that the |
| 385 | * memmap entries are valid from the bank end aligned to |
| 386 | * MAX_ORDER_NR_PAGES. |
| 387 | */ |
| 388 | prev_end = ALIGN(__phys_to_pfn(reg->base + reg->size), |
| 389 | MAX_ORDER_NR_PAGES); |
| 390 | } |
| 391 | |
| 392 | #ifdef CONFIG_SPARSEMEM |
| 393 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) |
| 394 | free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); |
| 395 | #endif |
| 396 | } |
| 397 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ |
| 398 | |
| 399 | /* |
| 400 | * mem_init() marks the free areas in the mem_map and tells us how much memory |
| 401 | * is free. This is done after various parts of the system have claimed their |
| 402 | * memory after the kernel image. |
| 403 | */ |
| 404 | void __init mem_init(void) |
| 405 | { |
| 406 | swiotlb_init(1); |
| 407 | |
| 408 | set_max_mapnr(pfn_to_page(max_pfn) - mem_map); |
| 409 | |
| 410 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
| 411 | free_unused_memmap(); |
| 412 | #endif |
| 413 | /* this will put all unused low memory onto the freelists */ |
| 414 | free_all_bootmem(); |
| 415 | |
| 416 | mem_init_print_info(NULL); |
| 417 | |
| 418 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
| 419 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 |
| 420 | #define MLG(b, t) b, t, ((t) - (b)) >> 30 |
| 421 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) |
| 422 | |
| 423 | pr_notice("Virtual kernel memory layout:\n"); |
| 424 | #ifdef CONFIG_KASAN |
| 425 | pr_cont(" kasan : 0x%16lx - 0x%16lx (%6ld GB)\n", |
| 426 | MLG(KASAN_SHADOW_START, KASAN_SHADOW_END)); |
| 427 | #endif |
| 428 | pr_cont(" modules : 0x%16lx - 0x%16lx (%6ld MB)\n", |
| 429 | MLM(MODULES_VADDR, MODULES_END)); |
| 430 | pr_cont(" vmalloc : 0x%16lx - 0x%16lx (%6ld GB)\n", |
| 431 | MLG(VMALLOC_START, VMALLOC_END)); |
| 432 | pr_cont(" .text : 0x%p" " - 0x%p" " (%6ld KB)\n", |
| 433 | MLK_ROUNDUP(_text, __start_rodata)); |
| 434 | pr_cont(" .rodata : 0x%p" " - 0x%p" " (%6ld KB)\n", |
| 435 | MLK_ROUNDUP(__start_rodata, _etext)); |
| 436 | pr_cont(" .init : 0x%p" " - 0x%p" " (%6ld KB)\n", |
| 437 | MLK_ROUNDUP(__init_begin, __init_end)); |
| 438 | pr_cont(" .data : 0x%p" " - 0x%p" " (%6ld KB)\n", |
| 439 | MLK_ROUNDUP(_sdata, _edata)); |
| 440 | pr_cont(" .bss : 0x%p" " - 0x%p" " (%6ld KB)\n", |
| 441 | MLK_ROUNDUP(__bss_start, __bss_stop)); |
| 442 | pr_cont(" fixed : 0x%16lx - 0x%16lx (%6ld KB)\n", |
| 443 | MLK(FIXADDR_START, FIXADDR_TOP)); |
| 444 | pr_cont(" PCI I/O : 0x%16lx - 0x%16lx (%6ld MB)\n", |
| 445 | MLM(PCI_IO_START, PCI_IO_END)); |
| 446 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 447 | pr_cont(" vmemmap : 0x%16lx - 0x%16lx (%6ld GB maximum)\n", |
| 448 | MLG(VMEMMAP_START, VMEMMAP_START + VMEMMAP_SIZE)); |
| 449 | pr_cont(" 0x%16lx - 0x%16lx (%6ld MB actual)\n", |
| 450 | MLM((unsigned long)phys_to_page(memblock_start_of_DRAM()), |
| 451 | (unsigned long)virt_to_page(high_memory))); |
| 452 | #endif |
| 453 | pr_cont(" memory : 0x%16lx - 0x%16lx (%6ld MB)\n", |
| 454 | MLM(__phys_to_virt(memblock_start_of_DRAM()), |
| 455 | (unsigned long)high_memory)); |
| 456 | |
| 457 | #undef MLK |
| 458 | #undef MLM |
| 459 | #undef MLK_ROUNDUP |
| 460 | |
| 461 | /* |
| 462 | * Check boundaries twice: Some fundamental inconsistencies can be |
| 463 | * detected at build time already. |
| 464 | */ |
| 465 | #ifdef CONFIG_COMPAT |
| 466 | BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); |
| 467 | #endif |
| 468 | |
| 469 | /* |
| 470 | * Make sure we chose the upper bound of sizeof(struct page) |
| 471 | * correctly. |
| 472 | */ |
| 473 | BUILD_BUG_ON(sizeof(struct page) > (1 << STRUCT_PAGE_MAX_SHIFT)); |
| 474 | |
| 475 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
| 476 | extern int sysctl_overcommit_memory; |
| 477 | /* |
| 478 | * On a machine this small we won't get anywhere without |
| 479 | * overcommit, so turn it on by default. |
| 480 | */ |
| 481 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | void free_initmem(void) |
| 486 | { |
| 487 | free_reserved_area(__va(__pa(__init_begin)), __va(__pa(__init_end)), |
| 488 | 0, "unused kernel"); |
| 489 | fixup_init(); |
| 490 | } |
| 491 | |
| 492 | #ifdef CONFIG_BLK_DEV_INITRD |
| 493 | |
| 494 | static int keep_initrd __initdata; |
| 495 | |
| 496 | void __init free_initrd_mem(unsigned long start, unsigned long end) |
| 497 | { |
| 498 | if (!keep_initrd) |
| 499 | free_reserved_area((void *)start, (void *)end, 0, "initrd"); |
| 500 | } |
| 501 | |
| 502 | static int __init keepinitrd_setup(char *__unused) |
| 503 | { |
| 504 | keep_initrd = 1; |
| 505 | return 1; |
| 506 | } |
| 507 | |
| 508 | __setup("keepinitrd", keepinitrd_setup); |
| 509 | #endif |
| 510 | |
| 511 | /* |
| 512 | * Dump out memory limit information on panic. |
| 513 | */ |
| 514 | static int dump_mem_limit(struct notifier_block *self, unsigned long v, void *p) |
| 515 | { |
| 516 | if (memory_limit != (phys_addr_t)ULLONG_MAX) { |
| 517 | pr_emerg("Memory Limit: %llu MB\n", memory_limit >> 20); |
| 518 | } else { |
| 519 | pr_emerg("Memory Limit: none\n"); |
| 520 | } |
| 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | static struct notifier_block mem_limit_notifier = { |
| 525 | .notifier_call = dump_mem_limit, |
| 526 | }; |
| 527 | |
| 528 | static int __init register_mem_limit_dumper(void) |
| 529 | { |
| 530 | atomic_notifier_chain_register(&panic_notifier_list, |
| 531 | &mem_limit_notifier); |
| 532 | return 0; |
| 533 | } |
| 534 | __initcall(register_mem_limit_dumper); |