cregit-Linux how code gets into the kernel

Release 4.15 kernel/range.c

Directory: kernel
// SPDX-License-Identifier: GPL-2.0
/*
 * Range add and subtract
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sort.h>
#include <linux/string.h>
#include <linux/range.h>


int add_range(struct range *range, int az, int nr_range, u64 start, u64 end) { if (start >= end) return nr_range; /* Out of slots: */ if (nr_range >= az) return nr_range; range[nr_range].start = start; range[nr_range].end = end; nr_range++; return nr_range; }

Contributors

PersonTokensPropCommitsCommitProp
Yinghai Lu65100.00%2100.00%
Total65100.00%2100.00%


int add_range_with_merge(struct range *range, int az, int nr_range, u64 start, u64 end) { int i; if (start >= end) return nr_range; /* get new start/end: */ for (i = 0; i < nr_range; i++) { u64 common_start, common_end; if (!range[i].end) continue; common_start = max(range[i].start, start); common_end = min(range[i].end, end); if (common_start > common_end) continue; /* new start/end, will add it back at last */ start = min(range[i].start, start); end = max(range[i].end, end); memmove(&range[i], &range[i + 1], (nr_range - (i + 1)) * sizeof(range[i])); range[nr_range - 1].start = 0; range[nr_range - 1].end = 0; nr_range--; i--; } /* Need to add it: */ return add_range(range, az, nr_range, start, end); }

Contributors

PersonTokensPropCommitsCommitProp
Yinghai Lu208100.00%4100.00%
Total208100.00%4100.00%


void subtract_range(struct range *range, int az, u64 start, u64 end) { int i, j; if (start >= end) return; for (j = 0; j < az; j++) { if (!range[j].end) continue; if (start <= range[j].start && end >= range[j].end) { range[j].start = 0; range[j].end = 0; continue; } if (start <= range[j].start && end < range[j].end && range[j].start < end) { range[j].start = end; continue; } if (start > range[j].start && end >= range[j].end && range[j].end > start) { range[j].end = start; continue; } if (start > range[j].start && end < range[j].end) { /* Find the new spare: */ for (i = 0; i < az; i++) { if (range[i].end == 0) break; } if (i < az) { range[i].end = range[j].end; range[i].start = end; } else { pr_err("%s: run out of slot in ranges\n", __func__); } range[j].end = start; continue; } } }

Contributors

PersonTokensPropCommitsCommitProp
Yinghai Lu27798.58%266.67%
Lin Feng41.42%133.33%
Total281100.00%3100.00%


static int cmp_range(const void *x1, const void *x2) { const struct range *r1 = x1; const struct range *r2 = x2; if (r1->start < r2->start) return -1; if (r1->start > r2->start) return 1; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Yinghai Lu4166.13%150.00%
Louis Langholtz2133.87%150.00%
Total62100.00%2100.00%


int clean_sort_range(struct range *range, int az) { int i, j, k = az - 1, nr_range = az; for (i = 0; i < k; i++) { if (range[i].end) continue; for (j = k; j > i; j--) { if (range[j].end) { k = j; break; } } if (j == i) break; range[i].start = range[k].start; range[i].end = range[k].end; range[k].start = 0; range[k].end = 0; k--; } /* count it */ for (i = 0; i < az; i++) { if (!range[i].end) { nr_range = i; break; } } /* sort them */ sort(range, nr_range, sizeof(struct range), cmp_range, NULL); return nr_range; }

Contributors

PersonTokensPropCommitsCommitProp
Yinghai Lu19399.48%150.00%
Alexey Khoroshilov10.52%150.00%
Total194100.00%2100.00%


void sort_range(struct range *range, int nr_range) { /* sort them */ sort(range, nr_range, sizeof(struct range), cmp_range, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Yinghai Lu31100.00%1100.00%
Total31100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Yinghai Lu83096.74%444.44%
Louis Langholtz212.45%111.11%
Lin Feng40.47%111.11%
Greg Kroah-Hartman10.12%111.11%
Paul Gortmaker10.12%111.11%
Alexey Khoroshilov10.12%111.11%
Total858100.00%9100.00%
Directory: kernel
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