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mm/nobootmem.c: add return value check in __alloc_memory_core_early()
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CommitLineData
09325873
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1/*
2 * bootmem - A boot-time physical memory allocator and configurator
3 *
4 * Copyright (C) 1999 Ingo Molnar
5 * 1999 Kanoj Sarcar, SGI
6 * 2008 Johannes Weiner
7 *
8 * Access to this subsystem has to be serialized externally (which is true
9 * for the boot process anyway).
10 */
11#include <linux/init.h>
12#include <linux/pfn.h>
13#include <linux/slab.h>
14#include <linux/bootmem.h>
b95f1b31 15#include <linux/export.h>
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16#include <linux/kmemleak.h>
17#include <linux/range.h>
18#include <linux/memblock.h>
19
20#include <asm/bug.h>
21#include <asm/io.h>
22#include <asm/processor.h>
23
24#include "internal.h"
25
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26#ifndef CONFIG_NEED_MULTIPLE_NODES
27struct pglist_data __refdata contig_page_data;
28EXPORT_SYMBOL(contig_page_data);
29#endif
30
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31unsigned long max_low_pfn;
32unsigned long min_low_pfn;
33unsigned long max_pfn;
34
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35static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
36 u64 goal, u64 limit)
37{
38 void *ptr;
39 u64 addr;
40
41 if (limit > memblock.current_limit)
42 limit = memblock.current_limit;
43
87029ee9 44 addr = memblock_find_in_range_node(size, align, goal, limit, nid);
1f5026a7 45 if (!addr)
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46 return NULL;
47
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48 if (memblock_reserve(addr, size))
49 return NULL;
50
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51 ptr = phys_to_virt(addr);
52 memset(ptr, 0, size);
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53 /*
54 * The min_count is set to 0 so that bootmem allocated blocks
55 * are never reported as leaks.
56 */
57 kmemleak_alloc(ptr, size, 0, 0);
58 return ptr;
59}
60
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61/*
62 * free_bootmem_late - free bootmem pages directly to page allocator
63 * @addr: starting address of the range
64 * @size: size of the range in bytes
65 *
66 * This is only useful when the bootmem allocator has already been torn
67 * down, but we are still initializing the system. Pages are given directly
68 * to the page allocator, no bootmem metadata is updated because it is gone.
69 */
70void __init free_bootmem_late(unsigned long addr, unsigned long size)
71{
72 unsigned long cursor, end;
73
74 kmemleak_free_part(__va(addr), size);
75
76 cursor = PFN_UP(addr);
77 end = PFN_DOWN(addr + size);
78
79 for (; cursor < end; cursor++) {
80 __free_pages_bootmem(pfn_to_page(cursor), 0);
81 totalram_pages++;
82 }
83}
84
85static void __init __free_pages_memory(unsigned long start, unsigned long end)
86{
309d0b39 87 int order;
09325873 88
309d0b39
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89 while (start < end) {
90 order = min(MAX_ORDER - 1UL, __ffs(start));
09325873 91
309d0b39
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92 while (start + (1UL << order) > end)
93 order--;
09325873 94
309d0b39 95 __free_pages_bootmem(pfn_to_page(start), order);
09325873 96
309d0b39
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97 start += (1UL << order);
98 }
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99}
100
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101static unsigned long __init __free_memory_core(phys_addr_t start,
102 phys_addr_t end)
103{
104 unsigned long start_pfn = PFN_UP(start);
105 unsigned long end_pfn = min_t(unsigned long,
106 PFN_DOWN(end), max_low_pfn);
107
108 if (start_pfn > end_pfn)
109 return 0;
110
111 __free_pages_memory(start_pfn, end_pfn);
112
113 return end_pfn - start_pfn;
114}
115
b4def350 116static unsigned long __init free_low_memory_core_early(void)
09325873 117{
09325873 118 unsigned long count = 0;
29f67386 119 phys_addr_t start, end, size;
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120 u64 i;
121
b1154233 122 for_each_free_mem_range(i, NUMA_NO_NODE, &start, &end, NULL)
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123 count += __free_memory_core(start, end);
124
125 /* free range that is used for reserved array if we allocate it */
126 size = get_allocated_memblock_reserved_regions_info(&start);
127 if (size)
128 count += __free_memory_core(start, start + size);
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129
130 return count;
131}
132
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133static int reset_managed_pages_done __initdata;
134
135static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
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136{
137 struct zone *z;
138
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139 if (reset_managed_pages_done)
140 return;
9feedc9d 141 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
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142 z->managed_pages = 0;
143}
144
145void __init reset_all_zones_managed_pages(void)
146{
147 struct pglist_data *pgdat;
148
149 for_each_online_pgdat(pgdat)
150 reset_node_managed_pages(pgdat);
151 reset_managed_pages_done = 1;
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152}
153
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154/**
155 * free_all_bootmem - release free pages to the buddy allocator
156 *
157 * Returns the number of pages actually released.
158 */
159unsigned long __init free_all_bootmem(void)
160{
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161 unsigned long pages;
162
7b4b2a0d 163 reset_all_zones_managed_pages();
9feedc9d 164
09325873 165 /*
b1154233 166 * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
25985edc 167 * because in some case like Node0 doesn't have RAM installed
09325873 168 * low ram will be on Node1
09325873 169 */
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170 pages = free_low_memory_core_early();
171 totalram_pages += pages;
172
173 return pages;
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174}
175
176/**
177 * free_bootmem_node - mark a page range as usable
178 * @pgdat: node the range resides on
179 * @physaddr: starting address of the range
180 * @size: size of the range in bytes
181 *
182 * Partial pages will be considered reserved and left as they are.
183 *
184 * The range must reside completely on the specified node.
185 */
186void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
187 unsigned long size)
188{
189 kmemleak_free_part(__va(physaddr), size);
24aa0788 190 memblock_free(physaddr, size);
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191}
192
193/**
194 * free_bootmem - mark a page range as usable
195 * @addr: starting address of the range
196 * @size: size of the range in bytes
197 *
198 * Partial pages will be considered reserved and left as they are.
199 *
200 * The range must be contiguous but may span node boundaries.
201 */
202void __init free_bootmem(unsigned long addr, unsigned long size)
203{
204 kmemleak_free_part(__va(addr), size);
24aa0788 205 memblock_free(addr, size);
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206}
207
208static void * __init ___alloc_bootmem_nopanic(unsigned long size,
209 unsigned long align,
210 unsigned long goal,
211 unsigned long limit)
212{
213 void *ptr;
214
215 if (WARN_ON_ONCE(slab_is_available()))
216 return kzalloc(size, GFP_NOWAIT);
217
218restart:
219
b1154233 220 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
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221
222 if (ptr)
223 return ptr;
224
225 if (goal != 0) {
226 goal = 0;
227 goto restart;
228 }
229
230 return NULL;
231}
232
233/**
234 * __alloc_bootmem_nopanic - allocate boot memory without panicking
235 * @size: size of the request in bytes
236 * @align: alignment of the region
237 * @goal: preferred starting address of the region
238 *
239 * The goal is dropped if it can not be satisfied and the allocation will
240 * fall back to memory below @goal.
241 *
242 * Allocation may happen on any node in the system.
243 *
244 * Returns NULL on failure.
245 */
246void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
247 unsigned long goal)
248{
249 unsigned long limit = -1UL;
250
251 return ___alloc_bootmem_nopanic(size, align, goal, limit);
252}
253
254static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
255 unsigned long goal, unsigned long limit)
256{
257 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
258
259 if (mem)
260 return mem;
261 /*
262 * Whoops, we cannot satisfy the allocation request.
263 */
264 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
265 panic("Out of memory");
266 return NULL;
267}
268
269/**
270 * __alloc_bootmem - allocate boot memory
271 * @size: size of the request in bytes
272 * @align: alignment of the region
273 * @goal: preferred starting address of the region
274 *
275 * The goal is dropped if it can not be satisfied and the allocation will
276 * fall back to memory below @goal.
277 *
278 * Allocation may happen on any node in the system.
279 *
280 * The function panics if the request can not be satisfied.
281 */
282void * __init __alloc_bootmem(unsigned long size, unsigned long align,
283 unsigned long goal)
284{
285 unsigned long limit = -1UL;
286
287 return ___alloc_bootmem(size, align, goal, limit);
288}
289
99ab7b19 290void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
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291 unsigned long size,
292 unsigned long align,
293 unsigned long goal,
294 unsigned long limit)
295{
296 void *ptr;
297
298again:
299 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
300 goal, limit);
301 if (ptr)
302 return ptr;
303
b1154233 304 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
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305 goal, limit);
306 if (ptr)
307 return ptr;
308
309 if (goal) {
310 goal = 0;
311 goto again;
312 }
313
314 return NULL;
315}
316
317void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
318 unsigned long align, unsigned long goal)
319{
320 if (WARN_ON_ONCE(slab_is_available()))
321 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
322
323 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
324}
325
326void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
327 unsigned long align, unsigned long goal,
328 unsigned long limit)
329{
330 void *ptr;
331
332 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
333 if (ptr)
334 return ptr;
335
336 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
337 panic("Out of memory");
338 return NULL;
339}
340
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341/**
342 * __alloc_bootmem_node - allocate boot memory from a specific node
343 * @pgdat: node to allocate from
344 * @size: size of the request in bytes
345 * @align: alignment of the region
346 * @goal: preferred starting address of the region
347 *
348 * The goal is dropped if it can not be satisfied and the allocation will
349 * fall back to memory below @goal.
350 *
351 * Allocation may fall back to any node in the system if the specified node
352 * can not hold the requested memory.
353 *
354 * The function panics if the request can not be satisfied.
355 */
356void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
357 unsigned long align, unsigned long goal)
358{
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359 if (WARN_ON_ONCE(slab_is_available()))
360 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
361
ba539868 362 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
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363}
364
365void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
366 unsigned long align, unsigned long goal)
367{
09325873 368 return __alloc_bootmem_node(pgdat, size, align, goal);
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369}
370
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371#ifndef ARCH_LOW_ADDRESS_LIMIT
372#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
373#endif
374
375/**
376 * __alloc_bootmem_low - allocate low boot memory
377 * @size: size of the request in bytes
378 * @align: alignment of the region
379 * @goal: preferred starting address of the region
380 *
381 * The goal is dropped if it can not be satisfied and the allocation will
382 * fall back to memory below @goal.
383 *
384 * Allocation may happen on any node in the system.
385 *
386 * The function panics if the request can not be satisfied.
387 */
388void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
389 unsigned long goal)
390{
391 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
392}
393
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394void * __init __alloc_bootmem_low_nopanic(unsigned long size,
395 unsigned long align,
396 unsigned long goal)
397{
398 return ___alloc_bootmem_nopanic(size, align, goal,
399 ARCH_LOW_ADDRESS_LIMIT);
400}
401
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402/**
403 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
404 * @pgdat: node to allocate from
405 * @size: size of the request in bytes
406 * @align: alignment of the region
407 * @goal: preferred starting address of the region
408 *
409 * The goal is dropped if it can not be satisfied and the allocation will
410 * fall back to memory below @goal.
411 *
412 * Allocation may fall back to any node in the system if the specified node
413 * can not hold the requested memory.
414 *
415 * The function panics if the request can not be satisfied.
416 */
417void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
418 unsigned long align, unsigned long goal)
419{
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420 if (WARN_ON_ONCE(slab_is_available()))
421 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
422
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423 return ___alloc_bootmem_node(pgdat, size, align, goal,
424 ARCH_LOW_ADDRESS_LIMIT);
09325873 425}