#define _GNU_SOURCE #include #include #include #include #include "locking.h" #include "cpusched.h" #include "xmalloc.h" #include "hash.h" struct map_entry { int fd; unsigned int cpu; struct map_entry *next; }; static struct hash_table mapper; static unsigned int *cpu_work_map = NULL; static unsigned int cpu_len = 0; static struct rwlock map_lock; static unsigned int get_appropriate_cpu(void) { unsigned int i, cpu = 0; unsigned int work = UINT_MAX; for (i = 0; i < cpu_len; ++i) { if (cpu_work_map[i] < work) { work = cpu_work_map[i]; cpu = i; } } return cpu; } unsigned int socket_to_cpu(int fd) { int cpu = 0; struct map_entry *entry; rwlock_rd_lock(&map_lock); entry = lookup_hash(fd, &mapper); while (entry && fd != entry->fd) entry = entry->next; if (entry && fd == entry->fd) cpu = entry->cpu; rwlock_unlock(&map_lock); return cpu; } unsigned int register_socket(int fd) { void **pos; struct map_entry *entry; rwlock_wr_lock(&map_lock); entry = xzmalloc(sizeof(*entry)); entry->fd = fd; entry->cpu = get_appropriate_cpu(); cpu_work_map[entry->cpu]++; pos = insert_hash(entry->fd, entry, &mapper); if (pos) { entry->next = (*pos); (*pos) = entry; } rwlock_unlock(&map_lock); return entry->cpu; } static struct map_entry *socket_to_map_entry(int fd) { struct map_entry *entry, *ret = NULL; rwlock_rd_lock(&map_lock); entry = lookup_hash(fd, &mapper); while (entry && fd != entry->fd) entry = entry->next; if (entry && fd == entry->fd) ret = entry; rwlock_unlock(&map_lock); return ret; } void unregister_socket(int fd) { struct map_entry *pos; struct map_entry *entry = socket_to_map_entry(fd); if (entry == NULL) return; rwlock_wr_lock(&map_lock); cpu_work_map[entry->cpu]--; pos = remove_hash(entry->fd, entry, entry->next, &mapper); while (pos && pos->next && pos->next != entry) pos = pos->next; if (pos && pos->next && pos->next == entry) pos->next = entry->next; entry->next = NULL; xfree(entry); rwlock_unlock(&map_lock); } static int cleanup_cpusched_batch(void *ptr) { struct map_entry *next; struct map_entry *entry = ptr; if (!entry) return 0; while ((next = entry->next)) { entry->next = NULL; xfree(entry); entry = next; } xfree(entry); return 0; } void init_cpusched(unsigned int cpus) { rwlock_init(&map_lock); cpu_len = cpus; cpu_work_map = xcalloc(cpu_len, sizeof(*cpu_work_map)); init_hash(&mapper); } void destroy_cpusched(void) { xfree(cpu_work_map); for_each_hash(&mapper, cleanup_cpusched_batch); free_hash(&mapper); rwlock_destroy(&map_lock); } name='qt'>
path: root/Documentation/i2c/fault-codes
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authorLinus Torvalds <torvalds@linux-foundation.org>2016-11-04 13:08:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-11-04 13:08:05 -0700
commit66cecb67894b35c6af17eb4e6b6aaec6c8957c2e (patch)
treec1986d590632735047174c5587d0b22b45b47a1e /Documentation/i2c/fault-codes
parent34c510b2eecd2fb8414998f54ce12c94e16d78a0 (diff)
parentd9092f52d7e61dd1557f2db2400ddb430e85937e (diff)
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM updates from Paolo Bonzini: "One NULL pointer dereference, and two fixes for regressions introduced during the merge window. The rest are fixes for MIPS, s390 and nested VMX" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: kvm: x86: Check memopp before dereference (CVE-2016-8630) kvm: nVMX: VMCLEAR an active shadow VMCS after last use KVM: x86: drop TSC offsetting kvm_x86_ops to fix KVM_GET/SET_CLOCK KVM: x86: fix wbinvd_dirty_mask use-after-free kvm/x86: Show WRMSR data is in hex kvm: nVMX: Fix kernel panics induced by illegal INVEPT/INVVPID types KVM: document lock orders KVM: fix OOPS on flush_work KVM: s390: Fix STHYI buffer alignment for diag224 KVM: MIPS: Precalculate MMIO load resume PC KVM: MIPS: Make ERET handle ERL before EXL KVM: MIPS: Fix lazy user ASID regenerate for SMP
Diffstat (limited to 'Documentation/i2c/fault-codes')