[PATCH 3/5] Unroll various INIT_* macros

From: David Howells
Date: Thu Jul 20 2017 - 08:50:44 EST

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Unroll various INIT_* macros into the single places they're used in
init/init_task.c.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

include/linux/ftrace.h | 12 -----
include/linux/init_task.h | 116 ---------------------------------------------
include/linux/irqflags.h | 2 -
include/linux/lockdep.h | 3 -
init/init_task.c | 98 +++++++++++++++++++++++++++++---------
5 files changed, 74 insertions(+), 157 deletions(-)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 5857390ac35a..7a99a8a33b5b 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -790,9 +790,6 @@ typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

-/* for init task */
-#define INIT_FTRACE_GRAPH .ret_stack = NULL,
-
/*
* Stack of return addresses for functions
* of a thread.
@@ -870,7 +867,6 @@ static inline void unpause_graph_tracing(void)
#else /* !CONFIG_FUNCTION_GRAPH_TRACER */

#define __notrace_funcgraph
-#define INIT_FTRACE_GRAPH

static inline void ftrace_graph_init_task(struct task_struct *t) { }
static inline void ftrace_graph_exit_task(struct task_struct *t) { }
@@ -949,10 +945,6 @@ extern int tracepoint_printk;
extern void disable_trace_on_warning(void);
extern int __disable_trace_on_warning;

-#ifdef CONFIG_PREEMPT
-#define INIT_TRACE_RECURSION .trace_recursion = 0,
-#endif
-
int tracepoint_printk_sysctl(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos);
@@ -961,10 +953,6 @@ int tracepoint_printk_sysctl(struct ctl_table *table, int write,
static inline void disable_trace_on_warning(void) { }
#endif /* CONFIG_TRACING */

-#ifndef INIT_TRACE_RECURSION
-#define INIT_TRACE_RECURSION
-#endif
-
#ifdef CONFIG_FTRACE_SYSCALLS

unsigned long arch_syscall_addr(int nr);
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 1305273efe35..212a2bdfaf6c 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -20,23 +20,9 @@

#include <asm/thread_info.h>

-#ifdef CONFIG_SMP
-# define INIT_PUSHABLE_TASKS(tsk) \
- .pushable_tasks = PLIST_NODE_INIT(tsk.pushable_tasks, MAX_PRIO),
-#else
-# define INIT_PUSHABLE_TASKS(tsk)
-#endif
-
extern struct files_struct init_files;
extern struct fs_struct init_fs;

-#ifdef CONFIG_CPUSETS
-#define INIT_CPUSET_SEQ(tsk) \
- .mems_allowed_seq = SEQCNT_ZERO(tsk.mems_allowed_seq),
-#else
-#define INIT_CPUSET_SEQ(tsk)
-#endif
-
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
#define INIT_PREV_CPUTIME(x) .prev_cputime = { \
.lock = __RAW_SPIN_LOCK_UNLOCKED(x.prev_cputime.lock), \
@@ -117,114 +103,12 @@ extern struct group_info init_groups;
.pid = &init_struct_pid, \
}

-#ifdef CONFIG_AUDITSYSCALL
-#define INIT_IDS \
- .loginuid = INVALID_UID, \
- .sessionid = (unsigned int)-1,
-#else
-#define INIT_IDS
-#endif

-#ifdef CONFIG_PREEMPT_RCU
-#define INIT_TASK_RCU_TREE_PREEMPT() \
- .rcu_blocked_node = NULL,
-#else
-#define INIT_TASK_RCU_TREE_PREEMPT(tsk)
-#endif
-#ifdef CONFIG_PREEMPT_RCU
-#define INIT_TASK_RCU_PREEMPT(tsk) \
- .rcu_read_lock_nesting = 0, \
- .rcu_read_unlock_special.s = 0, \
- .rcu_node_entry = LIST_HEAD_INIT(tsk.rcu_node_entry), \
- INIT_TASK_RCU_TREE_PREEMPT()
-#else
-#define INIT_TASK_RCU_PREEMPT(tsk)
-#endif
-#ifdef CONFIG_TASKS_RCU
-#define INIT_TASK_RCU_TASKS(tsk) \
- .rcu_tasks_holdout = false, \
- .rcu_tasks_holdout_list = \
- LIST_HEAD_INIT(tsk.rcu_tasks_holdout_list), \
- .rcu_tasks_idle_cpu = -1,
-#else
-#define INIT_TASK_RCU_TASKS(tsk)
-#endif

extern struct cred init_cred;

-#ifdef CONFIG_CGROUP_SCHED
-# define INIT_CGROUP_SCHED(tsk) \
- .sched_task_group = &root_task_group,
-#else
-# define INIT_CGROUP_SCHED(tsk)
-#endif
-
-#ifdef CONFIG_PERF_EVENTS
-# define INIT_PERF_EVENTS(tsk) \
- .perf_event_mutex = \
- __MUTEX_INITIALIZER(tsk.perf_event_mutex), \
- .perf_event_list = LIST_HEAD_INIT(tsk.perf_event_list),
-#else
-# define INIT_PERF_EVENTS(tsk)
-#endif
-
-#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
-# define INIT_VTIME(tsk) \
- .vtime.seqcount = SEQCNT_ZERO(tsk.vtime.seqcount), \
- .vtime.starttime = 0, \
- .vtime.state = VTIME_SYS,
-#else
-# define INIT_VTIME(tsk)
-#endif
-
#define INIT_TASK_COMM "swapper"

-#ifdef CONFIG_RT_MUTEXES
-# define INIT_RT_MUTEXES(tsk) \
- .pi_waiters = RB_ROOT, \
- .pi_top_task = NULL, \
- .pi_waiters_leftmost = NULL,
-#else
-# define INIT_RT_MUTEXES(tsk)
-#endif
-
-#ifdef CONFIG_NUMA_BALANCING
-# define INIT_NUMA_BALANCING(tsk) \
- .numa_preferred_nid = -1, \
- .numa_group = NULL, \
- .numa_faults = NULL,
-#else
-# define INIT_NUMA_BALANCING(tsk)
-#endif
-
-#ifdef CONFIG_KASAN
-# define INIT_KASAN(tsk) \
- .kasan_depth = 1,
-#else
-# define INIT_KASAN(tsk)
-#endif
-
-#ifdef CONFIG_LIVEPATCH
-# define INIT_LIVEPATCH(tsk) \
- .patch_state = KLP_UNDEFINED,
-#else
-# define INIT_LIVEPATCH(tsk)
-#endif
-
-#ifdef CONFIG_THREAD_INFO_IN_TASK
-# define INIT_TASK_TI(tsk) \
- .thread_info = INIT_THREAD_INFO(tsk), \
- .stack_refcount = ATOMIC_INIT(1),
-#else
-# define INIT_TASK_TI(tsk)
-#endif
-
-#ifdef CONFIG_SECURITY
-#define INIT_TASK_SECURITY .security = NULL,
-#else
-#define INIT_TASK_SECURITY
-#endif
-
/* Attach to the init_task data structure for proper alignment */
#ifdef CONFIG_ARCH_TASK_STRUCT_ON_STACK
#define __init_task_data __attribute__((__section__(".data..init_task")))
diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h
index 5dd1272d1ab2..fa4fd52e02ef 100644
--- a/include/linux/irqflags.h
+++ b/include/linux/irqflags.h
@@ -27,7 +27,6 @@
# define trace_hardirq_exit() do { current->hardirq_context--; } while (0)
# define lockdep_softirq_enter() do { current->softirq_context++; } while (0)
# define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
-# define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1,
#else
# define trace_hardirqs_on() do { } while (0)
# define trace_hardirqs_off() do { } while (0)
@@ -41,7 +40,6 @@
# define trace_hardirq_exit() do { } while (0)
# define lockdep_softirq_enter() do { } while (0)
# define lockdep_softirq_exit() do { } while (0)
-# define INIT_TRACE_IRQFLAGS
#endif

#if defined(CONFIG_IRQSOFF_TRACER) || \
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index fffe49f188e6..f18b06965646 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -375,8 +375,6 @@ extern struct pin_cookie lock_pin_lock(struct lockdep_map *lock);
extern void lock_repin_lock(struct lockdep_map *lock, struct pin_cookie);
extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie);

-# define INIT_LOCKDEP .lockdep_recursion = 0, .lockdep_reclaim_gfp = 0,
-
#define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0)

#define lockdep_assert_held(l) do { \
@@ -437,7 +435,6 @@ static inline void lockdep_on(void)
* #ifdef the call himself.
*/

-# define INIT_LOCKDEP
# define lockdep_reset() do { debug_locks = 1; } while (0)
# define lockdep_free_key_range(start, size) do { } while (0)
# define lockdep_sys_exit() do { } while (0)
diff --git a/init/init_task.c b/init/init_task.c
index 359ed4ea9502..00d78cedc996 100644
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -15,7 +15,6 @@
static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);

-
/*
* Set up the first task table, touch at your own risk!. Base=0,
* limit=0x1fffff (=2MB)
@@ -25,20 +24,23 @@ struct task_struct init_task
__init_task_data
#endif
= {
- INIT_TASK_TI(init_task)
+#ifdef CONFIG_THREAD_INFO_IN_TASK
+ .thread_info = INIT_THREAD_INFO(init_task),
+ .stack_refcount = ATOMIC_INIT(1),
+#endif
.state = 0,
.stack = init_stack,
.usage = ATOMIC_INIT(2),
.flags = PF_KTHREAD,
- .prio = MAX_PRIO-20,
- .static_prio = MAX_PRIO-20,
- .normal_prio = MAX_PRIO-20,
+ .prio = MAX_PRIO - 20,
+ .static_prio = MAX_PRIO - 20,
+ .normal_prio = MAX_PRIO - 20,
.policy = SCHED_NORMAL,
.cpus_allowed = CPU_MASK_ALL,
.nr_cpus_allowed= NR_CPUS,
.mm = NULL,
.active_mm = &init_mm,
- .restart_block = {
+ .restart_block = {
.fn = do_no_restart_syscall,
},
.se = {
@@ -49,8 +51,12 @@ struct task_struct init_task
.time_slice = RR_TIMESLICE,
},
.tasks = LIST_HEAD_INIT(init_task.tasks),
- INIT_PUSHABLE_TASKS(init_task)
- INIT_CGROUP_SCHED(init_task)
+#ifdef CONFIG_SMP
+ .pushable_tasks = PLIST_NODE_INIT(init_task.pushable_tasks, MAX_PRIO),
+#endif
+#ifdef CONFIG_CGROUP_SCHED
+ .sched_task_group = &root_task_group,
+#endif
.ptraced = LIST_HEAD_INIT(init_task.ptraced),
.ptrace_entry = LIST_HEAD_INIT(init_task.ptrace_entry),
.real_parent = &init_task,
@@ -84,24 +90,68 @@ struct task_struct init_task
},
.thread_group = LIST_HEAD_INIT(init_task.thread_group),
.thread_node = LIST_HEAD_INIT(init_signals.thread_head),
- INIT_IDS
- INIT_PERF_EVENTS(init_task)
- INIT_TRACE_IRQFLAGS
- INIT_LOCKDEP
- INIT_FTRACE_GRAPH
- INIT_TRACE_RECURSION
- INIT_TASK_RCU_PREEMPT(init_task)
- INIT_TASK_RCU_TASKS(init_task)
- INIT_CPUSET_SEQ(init_task)
- INIT_RT_MUTEXES(init_task)
+#ifdef CONFIG_AUDITSYSCALL
+ .loginuid = INVALID_UID,
+ .sessionid = (unsigned int)-1,
+#endif
+#ifdef CONFIG_PERF_EVENTS
+ .perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),
+ .perf_event_list = LIST_HEAD_INIT(init_task.perf_event_list),
+#endif
+#ifdef CONFIG_PREEMPT_RCU
+ .rcu_read_lock_nesting = 0,
+ .rcu_read_unlock_special.s = 0,
+ .rcu_node_entry = LIST_HEAD_INIT(init_task.rcu_node_entry),
+#ifdef CONFIG_PREEMPT_RCU
+ .rcu_blocked_node = NULL,
+#endif
+#endif
+#ifdef CONFIG_TASKS_RCU
+ .rcu_tasks_holdout = false,
+ .rcu_tasks_holdout_list = LIST_HEAD_INIT(init_task.rcu_tasks_holdout_list),
+ .rcu_tasks_idle_cpu = -1,
+#endif
+#ifdef CONFIG_CPUSETS
+ .mems_allowed_seq = SEQCNT_ZERO(init_task.mems_allowed_seq),
+#endif
+#ifdef CONFIG_RT_MUTEXES
+ .pi_waiters = RB_ROOT,
+ .pi_waiters_leftmost = NULL,
+#endif
INIT_PREV_CPUTIME(init_task)
- INIT_VTIME(init_task)
- INIT_NUMA_BALANCING(init_task)
- INIT_KASAN(init_task)
- INIT_LIVEPATCH(init_task)
- INIT_TASK_SECURITY
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
+ .vtime.seqcount = SEQCNT_ZERO(init_task.vtime_seqcount),
+ .vtime.starttime = 0,
+ .vtime.state = VTIME_SYS,
+#endif
+#ifdef CONFIG_NUMA_BALANCING
+ .numa_preferred_nid = -1,
+ .numa_group = NULL,
+ .numa_faults = NULL,
+#endif
+#ifdef CONFIG_KASAN
+ .kasan_depth = 1,
+#endif
+#ifdef CONFIG_TRACE_IRQFLAGS
+ .softirqs_enabled = 1,
+#endif
+#ifdef CONFIG_LOCKDEP
+ .lockdep_recursion = 0,
+ .lockdep_reclaim_gfp = 0,
+#endif
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ .ret_stack = NULL,
+#endif
+#if defined(CONFIG_TRACING) && defined(CONFIG_PREEMPT)
+ .trace_recursion = 0,
+#endif
+#ifdef CONFIG_LIVEPATCH
+ .patch_state = KLP_UNDEFINED,
+#endif
+#ifdef CONFIG_SECURITY
+ .security = NULL,
+#endif
};
-
EXPORT_SYMBOL(init_task);

/*

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