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Message-Id: <11927463622621-git-send-email-matthew@wil.cx>
Date: Thu, 18 Oct 2007 18:25:59 -0400
From: Matthew Wilcox <matthew@....cx>
To: linux-kernel@...r.kernel.org
Cc: Matthew Wilcox <matthew@....cx>,
Matthew Wilcox <willy@...ux.intel.com>
Subject: [PATCH 2/5] Use macros instead of TASK_ flags
Abstracting away direct uses of TASK_ flags allows us to change the
definitions of the task flags more easily.
Also restructure do_wait() a little
Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
---
arch/ia64/kernel/perfmon.c | 4 +-
fs/proc/array.c | 9 +---
fs/proc/base.c | 2 +-
include/linux/sched.h | 15 +++++++
include/linux/wait.h | 11 +++--
kernel/exit.c | 90 +++++++++++++++++++------------------------
kernel/power/process.c | 7 +--
kernel/ptrace.c | 8 ++--
kernel/sched.c | 15 +++----
kernel/signal.c | 6 +-
kernel/wait.c | 2 +-
11 files changed, 83 insertions(+), 86 deletions(-)
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index f55fa07..6b0a6cf 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -2630,7 +2630,7 @@ pfm_task_incompatible(pfm_context_t *ctx, struct task_struct *task)
*/
if (task == current) return 0;
- if ((task->state != TASK_STOPPED) && (task->state != TASK_TRACED)) {
+ if (!is_task_stopped_or_traced(task)) {
DPRINT(("cannot attach to non-stopped task [%d] state=%ld\n", task->pid, task->state));
return -EBUSY;
}
@@ -4790,7 +4790,7 @@ recheck:
* the task must be stopped.
*/
if (PFM_CMD_STOPPED(cmd)) {
- if ((task->state != TASK_STOPPED) && (task->state != TASK_TRACED)) {
+ if (!is_task_stopped_or_traced(task)) {
DPRINT(("[%d] task not in stopped state\n", task->pid));
return -EBUSY;
}
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 27b59f5..8939bf0 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -140,13 +140,8 @@ static const char *task_state_array[] = {
static inline const char *get_task_state(struct task_struct *tsk)
{
- unsigned int state = (tsk->state & (TASK_RUNNING |
- TASK_INTERRUPTIBLE |
- TASK_UNINTERRUPTIBLE |
- TASK_STOPPED |
- TASK_TRACED)) |
- (tsk->exit_state & (EXIT_ZOMBIE |
- EXIT_DEAD));
+ unsigned int state = (tsk->state & TASK_REPORT) |
+ (tsk->exit_state & (EXIT_ZOMBIE | EXIT_DEAD));
const char **p = &task_state_array[0];
while (state) {
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 4fe74d1..e7e1815 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -196,7 +196,7 @@ static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vf
(task == current || \
(task->parent == current && \
(task->ptrace & PT_PTRACED) && \
- (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
+ (is_task_stopped_or_traced(task)) && \
security_ptrace(current,task) == 0))
static int proc_pid_cmdline(struct task_struct *task, char * buffer)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index c204ab0..5ef5253 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -177,6 +177,21 @@ print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
/* in tsk->state again */
#define TASK_DEAD 64
+/* Convenience macros for the sake of wake_up */
+#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
+#define TASK_ALL (TASK_NORMAL | TASK_STOPPED | TASK_TRACED)
+
+/* get_task_state() */
+#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
+ TASK_UNINTERRUPTIBLE | TASK_STOPPED | \
+ TASK_TRACED)
+
+#define is_task_traced(task) ((task->state & TASK_TRACED) != 0)
+#define is_task_stopped(task) ((task->state & TASK_STOPPED) != 0)
+#define is_task_stopped_or_traced(task) \
+ ((task->state & (TASK_STOPPED | TASK_TRACED)) != 0)
+#define is_task_loadavg(task) ((task->state & TASK_UNINTERRUPTIBLE) != 0)
+
#define __set_task_state(tsk, state_value) \
do { (tsk)->state = (state_value); } while (0)
#define set_task_state(tsk, state_value) \
diff --git a/include/linux/wait.h b/include/linux/wait.h
index 0e68628..0a410a4 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -152,14 +152,15 @@ int FASTCALL(out_of_line_wait_on_bit(void *, int, int (*)(void *), unsigned));
int FASTCALL(out_of_line_wait_on_bit_lock(void *, int, int (*)(void *), unsigned));
wait_queue_head_t *FASTCALL(bit_waitqueue(void *, int));
-#define wake_up(x) __wake_up(x, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 1, NULL)
-#define wake_up_nr(x, nr) __wake_up(x, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, nr, NULL)
-#define wake_up_all(x) __wake_up(x, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 0, NULL)
+#define wake_up(x) __wake_up(x, TASK_NORMAL, 1, NULL)
+#define wake_up_nr(x, nr) __wake_up(x, TASK_NORMAL, nr, NULL)
+#define wake_up_all(x) __wake_up(x, TASK_NORMAL, 0, NULL)
+#define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL)
+
#define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL)
#define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL)
#define wake_up_interruptible_all(x) __wake_up(x, TASK_INTERRUPTIBLE, 0, NULL)
-#define wake_up_locked(x) __wake_up_locked((x), TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE)
-#define wake_up_interruptible_sync(x) __wake_up_sync((x),TASK_INTERRUPTIBLE, 1)
+#define wake_up_interruptible_sync(x) __wake_up_sync((x), TASK_INTERRUPTIBLE, 1)
#define __wait_event(wq, condition) \
do { \
diff --git a/kernel/exit.c b/kernel/exit.c
index 2c704c8..f3c6e8c 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -249,7 +249,7 @@ static int has_stopped_jobs(struct pid *pgrp)
struct task_struct *p;
do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
- if (p->state != TASK_STOPPED)
+ if (!is_task_stopped(p))
continue;
retval = 1;
break;
@@ -613,7 +613,7 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
p->parent = p->real_parent;
add_parent(p);
- if (p->state == TASK_TRACED) {
+ if (is_task_traced(p)) {
/*
* If it was at a trace stop, turn it into
* a normal stop since it's no longer being
@@ -1354,7 +1354,7 @@ static int wait_task_stopped(struct task_struct *p, int delayed_group_leader,
exit_code = p->exit_code;
if (unlikely(!exit_code) ||
- unlikely(p->state & TASK_TRACED))
+ unlikely(is_task_traced(p)))
goto bail_ref;
return wait_noreap_copyout(p, pid, uid,
why, (exit_code << 8) | 0x7f,
@@ -1533,60 +1533,51 @@ repeat:
}
allowed = 1;
- switch (p->state) {
- case TASK_TRACED:
- /*
- * When we hit the race with PTRACE_ATTACH,
- * we will not report this child. But the
- * race means it has not yet been moved to
- * our ptrace_children list, so we need to
- * set the flag here to avoid a spurious ECHILD
- * when the race happens with the only child.
- */
- flag = 1;
- if (!my_ptrace_child(p))
- continue;
- /*FALLTHROUGH*/
- case TASK_STOPPED:
+ if (is_task_stopped_or_traced(p)) {
/*
* It's stopped now, so it might later
* continue, exit, or stop again.
+ *
+ * When we hit the race with PTRACE_ATTACH, we
+ * will not report this child. But the race
+ * means it has not yet been moved to our
+ * ptrace_children list, so we need to set the
+ * flag here to avoid a spurious ECHILD when
+ * the race happens with the only child.
*/
flag = 1;
- if (!(options & WUNTRACED) &&
- !my_ptrace_child(p))
- continue;
+
+ if (!my_ptrace_child(p)) {
+ if (is_task_traced(p))
+ continue;
+ if (!(options & WUNTRACED))
+ continue;
+ }
+
retval = wait_task_stopped(p, ret == 2,
- (options & WNOWAIT),
- infop,
- stat_addr, ru);
+ (options & WNOWAIT), infop,
+ stat_addr, ru);
if (retval == -EAGAIN)
goto repeat;
if (retval != 0) /* He released the lock. */
goto end;
- break;
- default:
- // case EXIT_DEAD:
- if (p->exit_state == EXIT_DEAD)
+ } else if (p->exit_state == EXIT_DEAD) {
+ continue;
+ } else if (p->exit_state == EXIT_ZOMBIE) {
+ /*
+ * Eligible but we cannot release it yet:
+ */
+ if (ret == 2)
+ goto check_continued;
+ if (!likely(options & WEXITED))
continue;
- // case EXIT_ZOMBIE:
- if (p->exit_state == EXIT_ZOMBIE) {
- /*
- * Eligible but we cannot release
- * it yet:
- */
- if (ret == 2)
- goto check_continued;
- if (!likely(options & WEXITED))
- continue;
- retval = wait_task_zombie(
- p, (options & WNOWAIT),
- infop, stat_addr, ru);
- /* He released the lock. */
- if (retval != 0)
- goto end;
- break;
- }
+ retval = wait_task_zombie(p,
+ (options & WNOWAIT), infop,
+ stat_addr, ru);
+ /* He released the lock. */
+ if (retval != 0)
+ goto end;
+ } else {
check_continued:
/*
* It's running now, so it might later
@@ -1595,12 +1586,11 @@ check_continued:
flag = 1;
if (!unlikely(options & WCONTINUED))
continue;
- retval = wait_task_continued(
- p, (options & WNOWAIT),
- infop, stat_addr, ru);
+ retval = wait_task_continued(p,
+ (options & WNOWAIT), infop,
+ stat_addr, ru);
if (retval != 0) /* He released the lock. */
goto end;
- break;
}
}
if (!flag) {
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 3434940..ac0c27a 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -83,10 +83,10 @@ static void freeze_task(struct task_struct *p)
rmb();
if (!frozen(p)) {
set_freeze_flag(p);
- if (p->state == TASK_STOPPED)
+ if (is_task_stopped(p))
force_sig_specific(SIGSTOP, p);
spin_lock_irqsave(&p->sighand->siglock, flags);
- signal_wake_up(p, p->state == TASK_STOPPED);
+ signal_wake_up(p, is_task_stopped(p));
spin_unlock_irqrestore(&p->sighand->siglock, flags);
}
}
@@ -120,8 +120,7 @@ static int try_to_freeze_tasks(int freeze_user_space)
continue;
if (freeze_user_space) {
- if (p->state == TASK_TRACED &&
- frozen(p->parent)) {
+ if (is_task_traced(p) && frozen(p->parent)) {
cancel_freezing(p);
continue;
}
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index a73ebd3..7d1ef3b 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -50,7 +50,7 @@ void __ptrace_link(struct task_struct *child, struct task_struct *new_parent)
void ptrace_untrace(struct task_struct *child)
{
spin_lock(&child->sighand->siglock);
- if (child->state == TASK_TRACED) {
+ if (is_task_traced(child)) {
if (child->signal->flags & SIGNAL_STOP_STOPPED) {
child->state = TASK_STOPPED;
} else {
@@ -78,7 +78,7 @@ void __ptrace_unlink(struct task_struct *child)
add_parent(child);
}
- if (child->state == TASK_TRACED)
+ if (is_task_traced(child))
ptrace_untrace(child);
}
@@ -102,9 +102,9 @@ int ptrace_check_attach(struct task_struct *child, int kill)
&& child->signal != NULL) {
ret = 0;
spin_lock_irq(&child->sighand->siglock);
- if (child->state == TASK_STOPPED) {
+ if (is_task_stopped(child)) {
child->state = TASK_TRACED;
- } else if (child->state != TASK_TRACED && !kill) {
+ } else if (!is_task_traced(child) && !kill) {
ret = -ESRCH;
}
spin_unlock_irq(&child->sighand->siglock);
diff --git a/kernel/sched.c b/kernel/sched.c
index 92721d1..04f6141 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -961,7 +961,7 @@ static int effective_prio(struct task_struct *p)
*/
static void activate_task(struct rq *rq, struct task_struct *p, int wakeup)
{
- if (p->state == TASK_UNINTERRUPTIBLE)
+ if (is_task_loadavg(p))
rq->nr_uninterruptible--;
enqueue_task(rq, p, wakeup);
@@ -973,7 +973,7 @@ static void activate_task(struct rq *rq, struct task_struct *p, int wakeup)
*/
static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep)
{
- if (p->state == TASK_UNINTERRUPTIBLE)
+ if (is_task_loadavg(p))
rq->nr_uninterruptible++;
dequeue_task(rq, p, sleep);
@@ -1609,8 +1609,7 @@ out:
int fastcall wake_up_process(struct task_struct *p)
{
- return try_to_wake_up(p, TASK_STOPPED | TASK_TRACED |
- TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE, 0);
+ return try_to_wake_up(p, TASK_ALL, 0);
}
EXPORT_SYMBOL(wake_up_process);
@@ -3786,8 +3785,7 @@ void fastcall complete(struct completion *x)
spin_lock_irqsave(&x->wait.lock, flags);
x->done++;
- __wake_up_common(&x->wait, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE,
- 1, 0, NULL);
+ __wake_up_common(&x->wait, TASK_NORMAL, 1, 0, NULL);
spin_unlock_irqrestore(&x->wait.lock, flags);
}
EXPORT_SYMBOL(complete);
@@ -3798,8 +3796,7 @@ void fastcall complete_all(struct completion *x)
spin_lock_irqsave(&x->wait.lock, flags);
x->done += UINT_MAX/2;
- __wake_up_common(&x->wait, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE,
- 0, 0, NULL);
+ __wake_up_common(&x->wait, TASK_NORMAL, 0, 0, NULL);
spin_unlock_irqrestore(&x->wait.lock, flags);
}
EXPORT_SYMBOL(complete_all);
@@ -5172,7 +5169,7 @@ static void activate_idle_task(struct task_struct *p, struct rq *rq)
{
update_rq_clock(rq);
- if (p->state == TASK_UNINTERRUPTIBLE)
+ if (is_task_loadavg(p))
rq->nr_uninterruptible--;
enqueue_task(rq, p, 0);
diff --git a/kernel/signal.c b/kernel/signal.c
index 2124ffa..16c16a3 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -839,7 +839,7 @@ static inline int wants_signal(int sig, struct task_struct *p)
return 0;
if (sig == SIGKILL)
return 1;
- if (p->state & (TASK_STOPPED | TASK_TRACED))
+ if (is_task_stopped_or_traced(p))
return 0;
return task_curr(p) || !signal_pending(p);
}
@@ -1437,7 +1437,7 @@ void do_notify_parent(struct task_struct *tsk, int sig)
BUG_ON(sig == -1);
/* do_notify_parent_cldstop should have been called instead. */
- BUG_ON(tsk->state & (TASK_STOPPED|TASK_TRACED));
+ BUG_ON(is_task_stopped_or_traced(tsk));
BUG_ON(!tsk->ptrace &&
(tsk->group_leader != tsk || !thread_group_empty(tsk)));
@@ -1704,7 +1704,7 @@ static int do_signal_stop(int signr)
* so this check has no races.
*/
if (!t->exit_state &&
- !(t->state & (TASK_STOPPED|TASK_TRACED))) {
+ !is_task_stopped_or_traced(t)) {
stop_count++;
signal_wake_up(t, 0);
}
diff --git a/kernel/wait.c b/kernel/wait.c
index 444ddbf..f987688 100644
--- a/kernel/wait.c
+++ b/kernel/wait.c
@@ -215,7 +215,7 @@ void fastcall __wake_up_bit(wait_queue_head_t *wq, void *word, int bit)
{
struct wait_bit_key key = __WAIT_BIT_KEY_INITIALIZER(word, bit);
if (waitqueue_active(wq))
- __wake_up(wq, TASK_INTERRUPTIBLE|TASK_UNINTERRUPTIBLE, 1, &key);
+ __wake_up(wq, TASK_NORMAL, 1, &key);
}
EXPORT_SYMBOL(__wake_up_bit);
--
1.4.4.2
-
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