cregit-Linux how code gets into the kernel

Release 4.9 mm/memtest.c

Directory: mm
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/memblock.h>


static u64 patterns[] __initdata = {
	/* The first entry has to be 0 to leave memtest with zeroed memory */
	0,
	0xffffffffffffffffULL,
	0x5555555555555555ULL,
	0xaaaaaaaaaaaaaaaaULL,
	0x1111111111111111ULL,
	0x2222222222222222ULL,
	0x4444444444444444ULL,
	0x8888888888888888ULL,
	0x3333333333333333ULL,
	0x6666666666666666ULL,
	0x9999999999999999ULL,
	0xccccccccccccccccULL,
	0x7777777777777777ULL,
	0xbbbbbbbbbbbbbbbbULL,
	0xddddddddddddddddULL,
	0xeeeeeeeeeeeeeeeeULL,
	0x7a6c7258554e494cULL, /* yeah ;-) */
};


static void __init reserve_bad_mem(u64 pattern, phys_addr_t start_bad, phys_addr_t end_bad) { pr_info(" %016llx bad mem addr %pa - %pa reserved\n", cpu_to_be64(pattern), &start_bad, &end_bad); memblock_reserve(start_bad, end_bad - start_bad); }

Contributors

PersonTokensPropCommitsCommitProp
andreas herrmannandreas herrmann2970.73%125.00%
vladimir murzinvladimir murzin921.95%250.00%
tejun heotejun heo37.32%125.00%
Total41100.00%4100.00%


static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size) { u64 *p, *start, *end; phys_addr_t start_bad, last_bad; phys_addr_t start_phys_aligned; const size_t incr = sizeof(pattern); start_phys_aligned = ALIGN(start_phys, incr); start = __va(start_phys_aligned); end = start + (size - (start_phys_aligned - start_phys)) / incr; start_bad = 0; last_bad = 0; for (p = start; p < end; p++) *p = pattern; for (p = start; p < end; p++, start_phys_aligned += incr) { if (*p == pattern) continue; if (start_phys_aligned == last_bad + incr) { last_bad += incr; continue; } if (start_bad) reserve_bad_mem(pattern, start_bad, last_bad + incr); start_bad = last_bad = start_phys_aligned; } if (start_bad) reserve_bad_mem(pattern, start_bad, last_bad + incr); }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu11966.48%114.29%
andreas herrmannandreas herrmann4826.82%457.14%
thomas gleixnerthomas gleixner84.47%114.29%
vladimir murzinvladimir murzin42.23%114.29%
Total179100.00%7100.00%


static void __init do_one_pass(u64 pattern, phys_addr_t start, phys_addr_t end) { u64 i; phys_addr_t this_start, this_end; for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &this_start, &this_end, NULL) { this_start = clamp(this_start, start, end); this_end = clamp(this_end, start, end); if (this_start < this_end) { pr_info(" %pa - %pa pattern %016llx\n", &this_start, &this_end, cpu_to_be64(pattern)); memtest(pattern, this_start, this_end - this_start); } } }

Contributors

PersonTokensPropCommitsCommitProp
andreas herrmannandreas herrmann4546.39%116.67%
tejun heotejun heo4142.27%116.67%
vladimir murzinvladimir murzin88.25%233.33%
tony lucktony luck22.06%116.67%
grygorii strashkogrygorii strashko11.03%116.67%
Total97100.00%6100.00%

/* default is disabled */ static unsigned int memtest_pattern __initdata;
static int __init parse_memtest(char *arg) { int ret = 0; if (arg) ret = kstrtouint(arg, 0, &memtest_pattern); else memtest_pattern = ARRAY_SIZE(patterns); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu3274.42%266.67%
vladimir murzinvladimir murzin1125.58%133.33%
Total43100.00%3100.00%

early_param("memtest", parse_memtest);
void __init early_memtest(phys_addr_t start, phys_addr_t end) { unsigned int i; unsigned int idx = 0; if (!memtest_pattern) return; pr_info("early_memtest: # of tests: %u\n", memtest_pattern); for (i = memtest_pattern-1; i < UINT_MAX; --i) { idx = i % ARRAY_SIZE(patterns); do_one_pass(patterns[idx], start, end); } }

Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu3547.95%116.67%
andreas herrmannandreas herrmann2939.73%233.33%
alexander holleralexander holler56.85%116.67%
vladimir murzinvladimir murzin45.48%233.33%
Total73100.00%6100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
yinghai luyinghai lu21141.87%316.67%
andreas herrmannandreas herrmann19538.69%633.33%
tejun heotejun heo448.73%211.11%
vladimir murzinvladimir murzin377.34%316.67%
thomas gleixnerthomas gleixner81.59%15.56%
alexander holleralexander holler61.19%15.56%
tony lucktony luck20.40%15.56%
grygorii strashkogrygorii strashko10.20%15.56%
Total504100.00%18100.00%
Directory: mm