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vm->exiting: deal with exit_group() and concurrent page faults

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Balazs Gerofi
2015-03-22 18:04:12 +09:00
committed by Balazs Gerofi
parent fbb776e4fb
commit 4ebe778ede
4 changed files with 27 additions and 2 deletions
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10
kernel/process.c
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@@ -137,7 +137,8 @@ static int init_process_vm(struct process *owner, struct process_vm *vm)
vm->owner_process = owner;
memset(&vm->cpu_set, 0, sizeof(cpu_set_t));
ihk_mc_spinlock_init(&vm->cpu_set_lock);
vm->exiting = 0;
return 0;
}
@@ -1526,6 +1527,11 @@ static int do_page_fault_process_vm(struct process_vm *vm, void *fault_addr0, ui
ihk_mc_spinlock_lock_noirq(&vm->memory_range_lock);
if (vm->exiting) {
error = -ECANCELED;
goto out;
}
range = lookup_process_memory_range(vm, fault_addr, fault_addr+1);
if (range == NULL) {
error = -EFAULT;
@@ -1854,6 +1860,8 @@ void flush_process_memory(struct process *proc)
dkprintf("flush_process_memory(%p)\n", proc);
ihk_mc_spinlock_lock_noirq(&vm->memory_range_lock);
/* Let concurrent page faults know the VM will be gone */
vm->exiting = 1;
list_for_each_entry_safe(range, next, &vm->vm_range_list, list) {
if (range->memobj) {
// XXX: temporary of temporary