cregit-Linux how code gets into the kernel

Release 4.7 mm/nobootmem.c

Directory: mm
/*
 *  bootmem - A boot-time physical memory allocator and configurator
 *
 *  Copyright (C) 1999 Ingo Molnar
 *                1999 Kanoj Sarcar, SGI
 *                2008 Johannes Weiner
 *
 * Access to this subsystem has to be serialized externally (which is true
 * for the boot process anyway).
 */
#include <linux/init.h>
#include <linux/pfn.h>
#include <linux/slab.h>
#include <linux/bootmem.h>
#include <linux/export.h>
#include <linux/kmemleak.h>
#include <linux/range.h>
#include <linux/memblock.h>

#include <asm/bug.h>
#include <asm/io.h>
#include <asm/processor.h>

#include "internal.h"

#ifndef CONFIG_NEED_MULTIPLE_NODES

struct pglist_data __refdata contig_page_data;

EXPORT_SYMBOL(contig_page_data);
#endif


unsigned long max_low_pfn;

unsigned long min_low_pfn;

unsigned long max_pfn;

unsigned long long max_possible_pfn;


static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align, u64 goal, u64 limit) { void *ptr; u64 addr; ulong flags = choose_memblock_flags(); if (limit > memblock.current_limit) limit = memblock.current_limit; again: addr = memblock_find_in_range_node(size, align, goal, limit, nid, flags); if (!addr && (flags & MEMBLOCK_MIRROR)) { flags &= ~MEMBLOCK_MIRROR; pr_warn("Could not allocate %pap bytes of mirrored memory\n", &size); goto again; } if (!addr) return NULL; if (memblock_reserve(addr, size)) return NULL; ptr = phys_to_virt(addr); memset(ptr, 0, size); /* * The min_count is set to 0 so that bootmem allocated blocks * are never reported as leaks. */ kmemleak_alloc(ptr, size, 0, 0); return ptr; }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu9161.07%112.50%
tony lucktony luck3926.17%225.00%
joonsoo kimjoonsoo kim64.03%112.50%
philipp hachtmannphilipp hachtmann64.03%112.50%
grygorii strashkogrygorii strashko42.68%112.50%
tejun heotejun heo32.01%225.00%
Total149100.00%8100.00%

/* * free_bootmem_late - free bootmem pages directly to page allocator * @addr: starting address of the range * @size: size of the range in bytes * * This is only useful when the bootmem allocator has already been torn * down, but we are still initializing the system. Pages are given directly * to the page allocator, no bootmem metadata is updated because it is gone. */
void __init free_bootmem_late(unsigned long addr, unsigned long size) { unsigned long cursor, end; kmemleak_free_part(__va(addr), size); cursor = PFN_UP(addr); end = PFN_DOWN(addr + size); for (; cursor < end; cursor++) { __free_pages_bootmem(pfn_to_page(cursor), cursor, 0); totalram_pages++; } }

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PersonTokensPropCommitsCommitProp
yinghai luyinghai lu7197.26%150.00%
mel gormanmel gorman22.74%150.00%
Total73100.00%2100.00%


static void __init __free_pages_memory(unsigned long start, unsigned long end) { int order; while (start < end) { order = min(MAX_ORDER - 1UL, __ffs(start)); while (start + (1UL << order) > end) order--; __free_pages_bootmem(pfn_to_page(start), start, order); start += (1UL << order); } }

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PersonTokensPropCommitsCommitProp
yinghai luyinghai lu4053.33%133.33%
robin holtrobin holt3344.00%133.33%
mel gormanmel gorman22.67%133.33%
Total75100.00%3100.00%


static unsigned long __init __free_memory_core(phys_addr_t start, phys_addr_t end) { unsigned long start_pfn = PFN_UP(start); unsigned long end_pfn = min_t(unsigned long, PFN_DOWN(end), max_low_pfn); if (start_pfn > end_pfn) return 0; __free_pages_memory(start_pfn, end_pfn); return end_pfn - start_pfn; }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu57100.00%1100.00%
Total57100.00%1100.00%


static unsigned long __init free_low_memory_core_early(void) { unsigned long count = 0; phys_addr_t start, end; u64 i; memblock_clear_hotplug(0, -1); for_each_reserved_mem_region(i, &start, &end) reserve_bootmem_region(start, end); for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end, NULL) count += __free_memory_core(start, end); #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK { phys_addr_t size; /* Free memblock.reserved array if it was allocated */ size = get_allocated_memblock_reserved_regions_info(&start); if (size) count += __free_memory_core(start, start + size); /* Free memblock.memory array if it was allocated */ size = get_allocated_memblock_memory_regions_info(&start); if (size) count += __free_memory_core(start, start + size); } #endif return count; }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu4131.30%218.18%
philipp hachtmannphilipp hachtmann3526.72%218.18%
tejun heotejun heo2720.61%218.18%
nathan zimmernathan zimmer1511.45%19.09%
xishi qiuxishi qiu86.11%19.09%
tony lucktony luck21.53%19.09%
joonsoo kimjoonsoo kim21.53%19.09%
grygorii strashkogrygorii strashko10.76%19.09%
Total131100.00%11100.00%

static int reset_managed_pages_done __initdata;
void reset_node_managed_pages(pg_data_t *pgdat) { struct zone *z; for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) z->managed_pages = 0; }

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PersonTokensPropCommitsCommitProp
jiang liujiang liu39100.00%2100.00%
Total39100.00%2100.00%


void __init reset_all_zones_managed_pages(void) { struct pglist_data *pgdat; if (reset_managed_pages_done) return; for_each_online_pgdat(pgdat) reset_node_managed_pages(pgdat); reset_managed_pages_done = 1; }

Contributors

PersonTokensPropCommitsCommitProp
jiang liujiang liu2167.74%250.00%
yinghai luyinghai lu516.13%125.00%
tang chentang chen516.13%125.00%
Total31100.00%4100.00%

/** * free_all_bootmem - release free pages to the buddy allocator * * Returns the number of pages actually released. */
unsigned long __init free_all_bootmem(void) { unsigned long pages; reset_all_zones_managed_pages(); /* * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id * because in some case like Node0 doesn't have RAM installed * low ram will be on Node1 */ pages = free_low_memory_core_early(); totalram_pages += pages; return pages; }

Contributors

PersonTokensPropCommitsCommitProp
jiang liujiang liu2482.76%233.33%
yinghai luyinghai lu26.90%116.67%
tejun heotejun heo13.45%116.67%
joonsoo kimjoonsoo kim13.45%116.67%
grygorii strashkogrygorii strashko13.45%116.67%
Total29100.00%6100.00%

/** * free_bootmem_node - mark a page range as usable * @pgdat: node the range resides on * @physaddr: starting address of the range * @size: size of the range in bytes * * Partial pages will be considered reserved and left as they are. * * The range must reside completely on the specified node. */
void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, unsigned long size) { memblock_free(physaddr, size); }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu2496.00%150.00%
tejun heotejun heo14.00%150.00%
Total25100.00%2100.00%

/** * free_bootmem - mark a page range as usable * @addr: starting address of the range * @size: size of the range in bytes * * Partial pages will be considered reserved and left as they are. * * The range must be contiguous but may span node boundaries. */
void __init free_bootmem(unsigned long addr, unsigned long size) { memblock_free(addr, size); }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu2095.24%150.00%
tejun heotejun heo14.76%150.00%
Total21100.00%2100.00%


static void * __init ___alloc_bootmem_nopanic(unsigned long size, unsigned long align, unsigned long goal, unsigned long limit) { void *ptr; if (WARN_ON_ONCE(slab_is_available())) return kzalloc(size, GFP_NOWAIT); restart: ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit); if (ptr) return ptr; if (goal != 0) { goal = 0; goto restart; } return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu8598.84%150.00%
grygorii strashkogrygorii strashko11.16%150.00%
Total86100.00%2100.00%

/** * __alloc_bootmem_nopanic - allocate boot memory without panicking * @size: size of the request in bytes * @align: alignment of the region * @goal: preferred starting address of the region * * The goal is dropped if it can not be satisfied and the allocation will * fall back to memory below @goal. * * Allocation may happen on any node in the system. * * Returns NULL on failure. */
void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align, unsigned long goal) { unsigned long limit = -1UL; return ___alloc_bootmem_nopanic(size, align, goal, limit); }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu38100.00%1100.00%
Total38100.00%1100.00%


static void * __init ___alloc_bootmem(unsigned long size, unsigned long align, unsigned long goal, unsigned long limit) { void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit); if (mem) return mem; /* * Whoops, we cannot satisfy the allocation request. */ pr_alert("bootmem alloc of %lu bytes failed!\n", size); panic("Out of memory"); return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu6198.39%150.00%
joe perchesjoe perches11.61%150.00%
Total62100.00%2100.00%

/** * __alloc_bootmem - allocate boot memory * @size: size of the request in bytes * @align: alignment of the region * @goal: preferred starting address of the region * * The goal is dropped if it can not be satisfied and the allocation will * fall back to memory below @goal. * * Allocation may happen on any node in the system. * * The function panics if the request can not be satisfied. */
void * __init __alloc_bootmem(unsigned long size, unsigned long align, unsigned long goal) { unsigned long limit = -1UL; return ___alloc_bootmem(size, align, goal, limit); }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu38100.00%1100.00%
Total38100.00%1100.00%


void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal, unsigned long limit) { void *ptr; again: ptr = __alloc_memory_core_early(pgdat->node_id, size, align, goal, limit); if (ptr) return ptr; ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit); if (ptr) return ptr; if (goal) { goal = 0; goto again; } return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu5861.05%120.00%
david s. millerdavid s. miller1920.00%120.00%
johannes weinerjohannes weiner1717.89%240.00%
grygorii strashkogrygorii strashko11.05%120.00%
Total95100.00%5100.00%


void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal) { if (WARN_ON_ONCE(slab_is_available())) return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0); }

Contributors

PersonTokensPropCommitsCommitProp
johannes weinerjohannes weiner57100.00%1100.00%
Total57100.00%1100.00%


static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal, unsigned long limit) { void *ptr; ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit); if (ptr) return ptr; pr_alert("bootmem alloc of %lu bytes failed!\n", size); panic("Out of memory"); return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
johannes weinerjohannes weiner6492.75%233.33%
yinghai luyinghai lu22.90%116.67%
david s. millerdavid s. miller11.45%116.67%
joe perchesjoe perches11.45%116.67%
rashika kheriarashika kheria11.45%116.67%
Total69100.00%6100.00%

/** * __alloc_bootmem_node - allocate boot memory from a specific node * @pgdat: node to allocate from * @size: size of the request in bytes * @align: alignment of the region * @goal: preferred starting address of the region * * The goal is dropped if it can not be satisfied and the allocation will * fall back to memory below @goal. * * Allocation may fall back to any node in the system if the specified node * can not hold the requested memory. * * The function panics if the request can not be satisfied. */
void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal) { if (WARN_ON_ONCE(slab_is_available())) return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); return ___alloc_bootmem_node(pgdat, size, align, goal, 0); }

Contributors

PersonTokensPropCommitsCommitProp
johannes weinerjohannes weiner57100.00%1100.00%
Total57100.00%1100.00%


void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal) { return __alloc_bootmem_node(pgdat, size, align, goal); }

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PersonTokensPropCommitsCommitProp
yinghai luyinghai lu35100.00%1100.00%
Total35100.00%1100.00%

#ifndef ARCH_LOW_ADDRESS_LIMIT #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL #endif /** * __alloc_bootmem_low - allocate low boot memory * @size: size of the request in bytes * @align: alignment of the region * @goal: preferred starting address of the region * * The goal is dropped if it can not be satisfied and the allocation will * fall back to memory below @goal. * * Allocation may happen on any node in the system. * * The function panics if the request can not be satisfied. */
void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, unsigned long goal) { return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu31100.00%1100.00%
Total31100.00%1100.00%


void * __init __alloc_bootmem_low_nopanic(unsigned long size, unsigned long align, unsigned long goal) { return ___alloc_bootmem_nopanic(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu31100.00%1100.00%
Total31100.00%1100.00%

/** * __alloc_bootmem_low_node - allocate low boot memory from a specific node * @pgdat: node to allocate from * @size: size of the request in bytes * @align: alignment of the region * @goal: preferred starting address of the region * * The goal is dropped if it can not be satisfied and the allocation will * fall back to memory below @goal. * * Allocation may fall back to any node in the system if the specified node * can not hold the requested memory. * * The function panics if the request can not be satisfied. */
void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal) { if (WARN_ON_ONCE(slab_is_available())) return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); return ___alloc_bootmem_node(pgdat, size, align, goal, ARCH_LOW_ADDRESS_LIMIT); }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu5596.49%150.00%
johannes weinerjohannes weiner23.51%150.00%
Total57100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu86462.70%514.71%
johannes weinerjohannes weiner19814.37%25.88%
jiang liujiang liu906.53%38.82%
philipp hachtmannphilipp hachtmann412.98%38.82%
tony lucktony luck412.98%25.88%
tejun heotejun heo332.39%514.71%
robin holtrobin holt332.39%12.94%
david s. millerdavid s. miller201.45%12.94%
nathan zimmernathan zimmer151.09%12.94%
joonsoo kimjoonsoo kim90.65%25.88%
grygorii strashkogrygorii strashko80.58%25.88%
xishi qiuxishi qiu80.58%12.94%
tang chentang chen50.36%12.94%
igor mammedovigor mammedov50.36%12.94%
mel gormanmel gorman40.29%12.94%
joe perchesjoe perches20.15%12.94%
rashika kheriarashika kheria10.07%12.94%
paul gortmakerpaul gortmaker10.07%12.94%
Total1378100.00%34100.00%
Directory: mm
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