/* * Range add and subtract */ #include #include #include #include #include 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; } 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); } 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; } } } 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; } 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; } void sort_range(struct range *range, int nr_range) { /* sort them */ sort(range, nr_range, sizeof(struct range), cmp_range, NULL); } =19ca2c8fecb1592d623fe5e82d6796f8d446268d'>root/include/uapi/sound/Kbuild
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authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-24 12:21:51 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-24 12:21:51 -0800
commit19ca2c8fecb1592d623fe5e82d6796f8d446268d (patch)
tree0756e115d125846f46b302085307768f069434a1 /include/uapi/sound/Kbuild
parenta4685d2f58e2230d4e27fb2ee581d7ea35e5d046 (diff)
parent880a38547ff08715ce4f1daf9a4bb30c87676e68 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull namespace fix from Eric Biederman: "This has a single brown bag fix. The possible deadlock with dec_pid_namespaces that I had thought was fixed earlier turned out only to have been moved. So instead of being cleaver this change takes ucounts_lock with irqs disabled. So dec_ucount can be used from any context without fear of deadlock. The items accounted for dec_ucount and inc_ucount are all comparatively heavy weight objects so I don't exepct this will have any measurable performance impact" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: userns: Make ucounts lock irq-safe
Diffstat (limited to 'include/uapi/sound/Kbuild')