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0500871f21
Construct the init thread stack in the linker script rather than doing it by means of a union so that ia64's init_task.c can be got rid of. The following symbols are then made available from INIT_TASK_DATA() linker script macro: init_thread_union init_stack INIT_TASK_DATA() also expands the region to THREAD_SIZE to accommodate the size of the init stack. init_thread_union is given its own section so that it can be placed into the stack space in the right order. I'm assuming that the ia64 ordering is correct and that the task_struct is first and the thread_info second. Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Tony Luck <tony.luck@intel.com> Tested-by: Will Deacon <will.deacon@arm.com> (arm64) Tested-by: Palmer Dabbelt <palmer@sifive.com> Acked-by: Thomas Gleixner <tglx@linutronix.de>
311 lines
8 KiB
C
311 lines
8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX__INIT_TASK_H
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#define _LINUX__INIT_TASK_H
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#include <linux/rcupdate.h>
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#include <linux/irqflags.h>
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#include <linux/utsname.h>
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#include <linux/lockdep.h>
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#include <linux/ftrace.h>
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#include <linux/ipc.h>
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#include <linux/pid_namespace.h>
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#include <linux/user_namespace.h>
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#include <linux/securebits.h>
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#include <linux/seqlock.h>
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#include <linux/rbtree.h>
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#include <linux/sched/autogroup.h>
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#include <net/net_namespace.h>
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#include <linux/sched/rt.h>
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#include <linux/livepatch.h>
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#include <linux/mm_types.h>
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#include <asm/thread_info.h>
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#ifdef CONFIG_SMP
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# define INIT_PUSHABLE_TASKS(tsk) \
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.pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO),
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#else
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# define INIT_PUSHABLE_TASKS(tsk)
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#endif
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extern struct files_struct init_files;
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extern struct fs_struct init_fs;
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#ifdef CONFIG_CPUSETS
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#define INIT_CPUSET_SEQ(tsk) \
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.mems_allowed_seq = SEQCNT_ZERO(tsk.mems_allowed_seq),
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#else
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#define INIT_CPUSET_SEQ(tsk)
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#endif
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#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
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#define INIT_PREV_CPUTIME(x) .prev_cputime = { \
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.lock = __RAW_SPIN_LOCK_UNLOCKED(x.prev_cputime.lock), \
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},
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#else
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#define INIT_PREV_CPUTIME(x)
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#endif
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#ifdef CONFIG_POSIX_TIMERS
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#define INIT_POSIX_TIMERS(s) \
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.posix_timers = LIST_HEAD_INIT(s.posix_timers),
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#define INIT_CPU_TIMERS(s) \
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.cpu_timers = { \
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LIST_HEAD_INIT(s.cpu_timers[0]), \
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LIST_HEAD_INIT(s.cpu_timers[1]), \
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LIST_HEAD_INIT(s.cpu_timers[2]), \
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},
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#define INIT_CPUTIMER(s) \
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.cputimer = { \
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.cputime_atomic = INIT_CPUTIME_ATOMIC, \
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.running = false, \
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.checking_timer = false, \
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},
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#else
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#define INIT_POSIX_TIMERS(s)
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#define INIT_CPU_TIMERS(s)
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#define INIT_CPUTIMER(s)
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#endif
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#define INIT_SIGNALS(sig) { \
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.nr_threads = 1, \
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.thread_head = LIST_HEAD_INIT(init_task.thread_node), \
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.wait_chldexit = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
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.shared_pending = { \
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.list = LIST_HEAD_INIT(sig.shared_pending.list), \
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.signal = {{0}}}, \
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INIT_POSIX_TIMERS(sig) \
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INIT_CPU_TIMERS(sig) \
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.rlim = INIT_RLIMITS, \
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INIT_CPUTIMER(sig) \
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INIT_PREV_CPUTIME(sig) \
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.cred_guard_mutex = \
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__MUTEX_INITIALIZER(sig.cred_guard_mutex), \
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}
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extern struct nsproxy init_nsproxy;
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#define INIT_SIGHAND(sighand) { \
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.count = ATOMIC_INIT(1), \
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.action = { { { .sa_handler = SIG_DFL, } }, }, \
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.siglock = __SPIN_LOCK_UNLOCKED(sighand.siglock), \
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.signalfd_wqh = __WAIT_QUEUE_HEAD_INITIALIZER(sighand.signalfd_wqh), \
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}
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extern struct group_info init_groups;
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#define INIT_STRUCT_PID { \
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.count = ATOMIC_INIT(1), \
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.tasks = { \
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{ .first = NULL }, \
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{ .first = NULL }, \
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{ .first = NULL }, \
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}, \
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.level = 0, \
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.numbers = { { \
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.nr = 0, \
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.ns = &init_pid_ns, \
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}, } \
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}
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#define INIT_PID_LINK(type) \
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{ \
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.node = { \
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.next = NULL, \
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.pprev = NULL, \
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}, \
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.pid = &init_struct_pid, \
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}
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#ifdef CONFIG_AUDITSYSCALL
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#define INIT_IDS \
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.loginuid = INVALID_UID, \
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.sessionid = (unsigned int)-1,
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#else
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#define INIT_IDS
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#endif
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#ifdef CONFIG_PREEMPT_RCU
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#define INIT_TASK_RCU_PREEMPT(tsk) \
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.rcu_read_lock_nesting = 0, \
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.rcu_read_unlock_special.s = 0, \
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.rcu_node_entry = LIST_HEAD_INIT(tsk.rcu_node_entry), \
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.rcu_blocked_node = NULL,
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#else
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#define INIT_TASK_RCU_PREEMPT(tsk)
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#endif
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#ifdef CONFIG_TASKS_RCU
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#define INIT_TASK_RCU_TASKS(tsk) \
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.rcu_tasks_holdout = false, \
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.rcu_tasks_holdout_list = \
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LIST_HEAD_INIT(tsk.rcu_tasks_holdout_list), \
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.rcu_tasks_idle_cpu = -1,
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#else
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#define INIT_TASK_RCU_TASKS(tsk)
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#endif
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extern struct cred init_cred;
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#ifdef CONFIG_CGROUP_SCHED
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# define INIT_CGROUP_SCHED(tsk) \
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.sched_task_group = &root_task_group,
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#else
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# define INIT_CGROUP_SCHED(tsk)
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#endif
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#ifdef CONFIG_PERF_EVENTS
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# define INIT_PERF_EVENTS(tsk) \
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.perf_event_mutex = \
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__MUTEX_INITIALIZER(tsk.perf_event_mutex), \
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.perf_event_list = LIST_HEAD_INIT(tsk.perf_event_list),
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#else
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# define INIT_PERF_EVENTS(tsk)
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#endif
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
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# define INIT_VTIME(tsk) \
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.vtime.seqcount = SEQCNT_ZERO(tsk.vtime.seqcount), \
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.vtime.starttime = 0, \
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.vtime.state = VTIME_SYS,
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#else
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# define INIT_VTIME(tsk)
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#endif
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#define INIT_TASK_COMM "swapper"
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#ifdef CONFIG_RT_MUTEXES
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# define INIT_RT_MUTEXES(tsk) \
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.pi_waiters = RB_ROOT_CACHED, \
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.pi_top_task = NULL,
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#else
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# define INIT_RT_MUTEXES(tsk)
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#endif
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#ifdef CONFIG_NUMA_BALANCING
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# define INIT_NUMA_BALANCING(tsk) \
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.numa_preferred_nid = -1, \
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.numa_group = NULL, \
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.numa_faults = NULL,
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#else
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# define INIT_NUMA_BALANCING(tsk)
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#endif
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#ifdef CONFIG_KASAN
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# define INIT_KASAN(tsk) \
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.kasan_depth = 1,
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#else
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# define INIT_KASAN(tsk)
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#endif
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#ifdef CONFIG_LIVEPATCH
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# define INIT_LIVEPATCH(tsk) \
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.patch_state = KLP_UNDEFINED,
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#else
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# define INIT_LIVEPATCH(tsk)
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#endif
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#ifdef CONFIG_THREAD_INFO_IN_TASK
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# define INIT_TASK_TI(tsk) \
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.thread_info = INIT_THREAD_INFO(tsk), \
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.stack_refcount = ATOMIC_INIT(1),
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#else
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# define INIT_TASK_TI(tsk)
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#endif
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#ifdef CONFIG_SECURITY
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#define INIT_TASK_SECURITY .security = NULL,
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#else
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#define INIT_TASK_SECURITY
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#endif
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/*
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* INIT_TASK is used to set up the first task table, touch at
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* your own risk!. Base=0, limit=0x1fffff (=2MB)
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*/
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#define INIT_TASK(tsk) \
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{ \
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INIT_TASK_TI(tsk) \
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.state = 0, \
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.stack = init_stack, \
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.usage = ATOMIC_INIT(2), \
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.flags = PF_KTHREAD, \
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.prio = MAX_PRIO-20, \
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.static_prio = MAX_PRIO-20, \
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.normal_prio = MAX_PRIO-20, \
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.policy = SCHED_NORMAL, \
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.cpus_allowed = CPU_MASK_ALL, \
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.nr_cpus_allowed= NR_CPUS, \
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.mm = NULL, \
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.active_mm = &init_mm, \
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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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.se = { \
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.group_node = LIST_HEAD_INIT(tsk.se.group_node), \
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}, \
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.rt = { \
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.run_list = LIST_HEAD_INIT(tsk.rt.run_list), \
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.time_slice = RR_TIMESLICE, \
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}, \
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.tasks = LIST_HEAD_INIT(tsk.tasks), \
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INIT_PUSHABLE_TASKS(tsk) \
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INIT_CGROUP_SCHED(tsk) \
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.ptraced = LIST_HEAD_INIT(tsk.ptraced), \
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.ptrace_entry = LIST_HEAD_INIT(tsk.ptrace_entry), \
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.real_parent = &tsk, \
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.parent = &tsk, \
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.children = LIST_HEAD_INIT(tsk.children), \
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.sibling = LIST_HEAD_INIT(tsk.sibling), \
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.group_leader = &tsk, \
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RCU_POINTER_INITIALIZER(real_cred, &init_cred), \
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RCU_POINTER_INITIALIZER(cred, &init_cred), \
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.comm = INIT_TASK_COMM, \
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.thread = INIT_THREAD, \
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.fs = &init_fs, \
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.files = &init_files, \
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.signal = &init_signals, \
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.sighand = &init_sighand, \
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.nsproxy = &init_nsproxy, \
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.pending = { \
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.list = LIST_HEAD_INIT(tsk.pending.list), \
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.signal = {{0}}}, \
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.blocked = {{0}}, \
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.alloc_lock = __SPIN_LOCK_UNLOCKED(tsk.alloc_lock), \
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.journal_info = NULL, \
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INIT_CPU_TIMERS(tsk) \
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.pi_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock), \
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.timer_slack_ns = 50000, /* 50 usec default slack */ \
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.pids = { \
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[PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \
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[PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID), \
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[PIDTYPE_SID] = INIT_PID_LINK(PIDTYPE_SID), \
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}, \
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.thread_group = LIST_HEAD_INIT(tsk.thread_group), \
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.thread_node = LIST_HEAD_INIT(init_signals.thread_head), \
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INIT_IDS \
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INIT_PERF_EVENTS(tsk) \
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INIT_TRACE_IRQFLAGS \
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INIT_LOCKDEP \
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INIT_FTRACE_GRAPH \
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INIT_TRACE_RECURSION \
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INIT_TASK_RCU_PREEMPT(tsk) \
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INIT_TASK_RCU_TASKS(tsk) \
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INIT_CPUSET_SEQ(tsk) \
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INIT_RT_MUTEXES(tsk) \
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INIT_PREV_CPUTIME(tsk) \
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INIT_VTIME(tsk) \
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INIT_NUMA_BALANCING(tsk) \
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INIT_KASAN(tsk) \
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INIT_LIVEPATCH(tsk) \
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INIT_TASK_SECURITY \
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}
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/* Attach to the init_task data structure for proper alignment */
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#define __init_task_data __attribute__((__section__(".data..init_task")))
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/* Attach to the thread_info data structure for proper alignment */
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#define __init_thread_info __attribute__((__section__(".data..init_thread_info")))
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#endif
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