From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Jens Axboe <axboe@kernel.dk>, Alasdair Kergon <agk@redhat.com>,
Mike Snitzer <snitzer@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Felipe Balbi <balbi@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Tejun Heo <tj@kernel.org>, Zefan Li <lizefan.x@bytedance.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Jason Wessel <jason.wessel@windriver.com>,
Daniel Thompson <daniel.thompson@linaro.org>,
Douglas Anderson <dianders@chromium.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Pavel Machek <pavel@ucw.cz>, Will Deacon <will@kernel.org>,
Waiman Long <longman@redhat.com>,
Boqun Feng <boqun.feng@gmail.com>,
Oleg Nesterov <oleg@redhat.com>,
Davidlohr Bueso <dave@stgolabs.net>,
"Paul E. McKenney" <paulmck@kernel.org>,
Josh Triplett <josh@joshtriplett.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Joel Fernandes <joel@joelfernandes.org>,
John Stultz <john.stultz@linaro.org>,
Stephen Boyd <sboyd@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Stephen Rothwell <sfr@canb.auug.org.au>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
Subject: [PATCH v2 2/7] sched: Introduce task_is_running()
Date: Fri, 11 Jun 2021 10:28:12 +0200 [thread overview]
Message-ID: <20210611082838.222401495@infradead.org> (raw)
In-Reply-To: <20210611082810.970791107@infradead.org>
Replace a bunch of 'p->state == TASK_RUNNING' with a new helper:
task_is_running(p).
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
---
arch/alpha/kernel/process.c | 2 +-
arch/arc/kernel/stacktrace.c | 2 +-
arch/arm/kernel/process.c | 2 +-
arch/arm64/kernel/process.c | 2 +-
arch/csky/kernel/stacktrace.c | 2 +-
arch/h8300/kernel/process.c | 2 +-
arch/hexagon/kernel/process.c | 2 +-
arch/ia64/kernel/process.c | 4 ++--
arch/m68k/kernel/process.c | 2 +-
arch/mips/kernel/process.c | 2 +-
arch/nds32/kernel/process.c | 2 +-
arch/nios2/kernel/process.c | 2 +-
arch/parisc/kernel/process.c | 4 ++--
arch/powerpc/kernel/process.c | 4 ++--
arch/riscv/kernel/stacktrace.c | 2 +-
arch/s390/kernel/process.c | 2 +-
arch/s390/mm/fault.c | 2 +-
arch/sh/kernel/process_32.c | 2 +-
arch/sparc/kernel/process_32.c | 3 +--
arch/sparc/kernel/process_64.c | 3 +--
arch/um/kernel/process.c | 2 +-
arch/x86/kernel/process.c | 4 ++--
arch/xtensa/kernel/process.c | 2 +-
block/blk-mq.c | 2 +-
include/linux/sched.h | 2 ++
kernel/kcsan/report.c | 2 +-
kernel/locking/lockdep.c | 2 +-
kernel/rcu/tree_plugin.h | 2 +-
kernel/sched/core.c | 6 +++---
kernel/sched/stats.h | 2 +-
kernel/signal.c | 2 +-
kernel/softirq.c | 3 +--
mm/compaction.c | 2 +-
33 files changed, 40 insertions(+), 41 deletions(-)
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -380,7 +380,7 @@ get_wchan(struct task_struct *p)
{
unsigned long schedule_frame;
unsigned long pc;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
/*
* This one depends on the frame size of schedule(). Do a
--- a/arch/arc/kernel/stacktrace.c
+++ b/arch/arc/kernel/stacktrace.c
@@ -83,7 +83,7 @@ seed_unwind_frame_info(struct task_struc
* is safe-kept and BLINK at a well known location in there
*/
- if (tsk->state == TASK_RUNNING)
+ if (task_is_running(tsk))
return -1;
frame_info->task = tsk;
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -288,7 +288,7 @@ unsigned long get_wchan(struct task_stru
struct stackframe frame;
unsigned long stack_page;
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
frame.fp = thread_saved_fp(p);
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -598,7 +598,7 @@ unsigned long get_wchan(struct task_stru
struct stackframe frame;
unsigned long stack_page, ret = 0;
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
stack_page = (unsigned long)try_get_task_stack(p);
--- a/arch/csky/kernel/stacktrace.c
+++ b/arch/csky/kernel/stacktrace.c
@@ -115,7 +115,7 @@ unsigned long get_wchan(struct task_stru
{
unsigned long pc = 0;
- if (likely(task && task != current && task->state != TASK_RUNNING))
+ if (likely(task && task != current && !task_is_running(task)))
walk_stackframe(task, NULL, save_wchan, &pc);
return pc;
}
--- a/arch/h8300/kernel/process.c
+++ b/arch/h8300/kernel/process.c
@@ -134,7 +134,7 @@ unsigned long get_wchan(struct task_stru
unsigned long stack_page;
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
stack_page = (unsigned long)p;
--- a/arch/hexagon/kernel/process.c
+++ b/arch/hexagon/kernel/process.c
@@ -135,7 +135,7 @@ unsigned long get_wchan(struct task_stru
unsigned long fp, pc;
unsigned long stack_page;
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
stack_page = (unsigned long)task_stack_page(p);
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -529,7 +529,7 @@ get_wchan (struct task_struct *p)
unsigned long ip;
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
/*
@@ -542,7 +542,7 @@ get_wchan (struct task_struct *p)
*/
unw_init_from_blocked_task(&info, p);
do {
- if (p->state == TASK_RUNNING)
+ if (task_is_running(p))
return 0;
if (unw_unwind(&info) < 0)
return 0;
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -268,7 +268,7 @@ unsigned long get_wchan(struct task_stru
unsigned long fp, pc;
unsigned long stack_page;
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
stack_page = (unsigned long)task_stack_page(p);
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -662,7 +662,7 @@ unsigned long get_wchan(struct task_stru
unsigned long ra = 0;
#endif
- if (!task || task == current || task->state == TASK_RUNNING)
+ if (!task || task == current || task_is_running(task))
goto out;
if (!task_stack_page(task))
goto out;
--- a/arch/nds32/kernel/process.c
+++ b/arch/nds32/kernel/process.c
@@ -239,7 +239,7 @@ unsigned long get_wchan(struct task_stru
unsigned long stack_start, stack_end;
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
if (IS_ENABLED(CONFIG_FRAME_POINTER)) {
--- a/arch/nios2/kernel/process.c
+++ b/arch/nios2/kernel/process.c
@@ -223,7 +223,7 @@ unsigned long get_wchan(struct task_stru
unsigned long stack_page;
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
stack_page = (unsigned long)p;
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -249,7 +249,7 @@ get_wchan(struct task_struct *p)
unsigned long ip;
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
/*
@@ -260,7 +260,7 @@ get_wchan(struct task_struct *p)
do {
if (unwind_once(&info) < 0)
return 0;
- if (p->state == TASK_RUNNING)
+ if (task_is_running(p))
return 0;
ip = info.ip;
if (!in_sched_functions(ip))
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -2084,7 +2084,7 @@ static unsigned long __get_wchan(struct
unsigned long ip, sp;
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
sp = p->thread.ksp;
@@ -2094,7 +2094,7 @@ static unsigned long __get_wchan(struct
do {
sp = *(unsigned long *)sp;
if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD) ||
- p->state == TASK_RUNNING)
+ task_is_running(p))
return 0;
if (count > 0) {
ip = ((unsigned long *)sp)[STACK_FRAME_LR_SAVE];
--- a/arch/riscv/kernel/stacktrace.c
+++ b/arch/riscv/kernel/stacktrace.c
@@ -132,7 +132,7 @@ unsigned long get_wchan(struct task_stru
{
unsigned long pc = 0;
- if (likely(task && task != current && task->state != TASK_RUNNING))
+ if (likely(task && task != current && !task_is_running(task)))
walk_stackframe(task, NULL, save_wchan, &pc);
return pc;
}
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -180,7 +180,7 @@ unsigned long get_wchan(struct task_stru
struct unwind_state state;
unsigned long ip = 0;
- if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p))
+ if (!p || p == current || task_is_running(p) || !task_stack_page(p))
return 0;
if (!try_get_task_stack(p))
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -702,7 +702,7 @@ static void pfault_interrupt(struct ext_
* interrupt since it must be a leftover of a PFAULT
* CANCEL operation which didn't remove all pending
* completion interrupts. */
- if (tsk->state == TASK_RUNNING)
+ if (task_is_running(tsk))
tsk->thread.pfault_wait = -1;
}
} else {
--- a/arch/sh/kernel/process_32.c
+++ b/arch/sh/kernel/process_32.c
@@ -186,7 +186,7 @@ unsigned long get_wchan(struct task_stru
{
unsigned long pc;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
/*
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -376,8 +376,7 @@ unsigned long get_wchan(struct task_stru
struct reg_window32 *rw;
int count = 0;
- if (!task || task == current ||
- task->state == TASK_RUNNING)
+ if (!task || task == current || task_is_running(task))
goto out;
fp = task_thread_info(task)->ksp + bias;
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -674,8 +674,7 @@ unsigned long get_wchan(struct task_stru
unsigned long ret = 0;
int count = 0;
- if (!task || task == current ||
- task->state == TASK_RUNNING)
+ if (!task || task == current || task_is_running(task))
goto out;
tp = task_thread_info(task);
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -369,7 +369,7 @@ unsigned long get_wchan(struct task_stru
unsigned long stack_page, sp, ip;
bool seen_sched = 0;
- if ((p == NULL) || (p == current) || (p->state == TASK_RUNNING))
+ if ((p == NULL) || (p == current) || task_is_running(p))
return 0;
stack_page = (unsigned long) task_stack_page(p);
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -931,7 +931,7 @@ unsigned long get_wchan(struct task_stru
unsigned long start, bottom, top, sp, fp, ip, ret = 0;
int count = 0;
- if (p == current || p->state == TASK_RUNNING)
+ if (p == current || task_is_running(p))
return 0;
if (!try_get_task_stack(p))
@@ -975,7 +975,7 @@ unsigned long get_wchan(struct task_stru
goto out;
}
fp = READ_ONCE_NOCHECK(*(unsigned long *)fp);
- } while (count++ < 16 && p->state != TASK_RUNNING);
+ } while (count++ < 16 && !task_is_running(p));
out:
put_task_stack(p);
--- a/arch/xtensa/kernel/process.c
+++ b/arch/xtensa/kernel/process.c
@@ -304,7 +304,7 @@ unsigned long get_wchan(struct task_stru
unsigned long stack_page = (unsigned long) task_stack_page(p);
int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ if (!p || p == current || task_is_running(p))
return 0;
sp = p->thread.sp;
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -3926,7 +3926,7 @@ int blk_poll(struct request_queue *q, bl
if (signal_pending_state(state, current))
__set_current_state(TASK_RUNNING);
- if (current->state == TASK_RUNNING)
+ if (task_is_running(current))
return 1;
if (ret < 0 || !spin)
break;
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -113,6 +113,8 @@ struct task_group;
__TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \
TASK_PARKED)
+#define task_is_running(task) (READ_ONCE((task)->state) == TASK_RUNNING)
+
#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
--- a/kernel/kcsan/report.c
+++ b/kernel/kcsan/report.c
@@ -460,7 +460,7 @@ static void set_other_info_task_blocking
* We may be instrumenting a code-path where current->state is already
* something other than TASK_RUNNING.
*/
- const bool is_running = current->state == TASK_RUNNING;
+ const bool is_running = task_is_running(current);
/*
* To avoid deadlock in case we are in an interrupt here and this is a
* race with a task on the same CPU (KCSAN_INTERRUPT_WATCHER), provide a
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -760,7 +760,7 @@ static void lockdep_print_held_locks(str
* It's not reliable to print a task's held locks if it's not sleeping
* and it's not the current task.
*/
- if (p->state == TASK_RUNNING && p != current)
+ if (p != current && task_is_running(p))
return;
for (i = 0; i < depth; i++) {
printk(" #%d: ", i);
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -2768,7 +2768,7 @@ EXPORT_SYMBOL_GPL(rcu_bind_current_to_no
#ifdef CONFIG_SMP
static char *show_rcu_should_be_on_cpu(struct task_struct *tsp)
{
- return tsp && tsp->state == TASK_RUNNING && !tsp->on_cpu ? "!" : "";
+ return tsp && task_is_running(tsp) && !tsp->on_cpu ? "!" : "";
}
#else // #ifdef CONFIG_SMP
static char *show_rcu_should_be_on_cpu(struct task_struct *tsp)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5989,7 +5989,7 @@ static inline void sched_submit_work(str
{
unsigned int task_flags;
- if (!tsk->state)
+ if (task_is_running(tsk))
return;
task_flags = tsk->flags;
@@ -7964,7 +7964,7 @@ int __sched yield_to(struct task_struct
if (curr->sched_class != p->sched_class)
goto out_unlock;
- if (task_running(p_rq, p) || p->state)
+ if (task_running(p_rq, p) || !task_is_running(p))
goto out_unlock;
yielded = curr->sched_class->yield_to_task(rq, p);
@@ -8167,7 +8167,7 @@ void sched_show_task(struct task_struct
pr_info("task:%-15.15s state:%c", p->comm, task_state_to_char(p));
- if (p->state == TASK_RUNNING)
+ if (task_is_running(p))
pr_cont(" running task ");
#ifdef CONFIG_DEBUG_STACK_USAGE
free = stack_not_used(p);
--- a/kernel/sched/stats.h
+++ b/kernel/sched/stats.h
@@ -217,7 +217,7 @@ static inline void sched_info_depart(str
rq_sched_info_depart(rq, delta);
- if (t->state == TASK_RUNNING)
+ if (task_is_running(t))
sched_info_enqueue(rq, t);
}
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -4719,7 +4719,7 @@ void kdb_send_sig(struct task_struct *t,
}
new_t = kdb_prev_t != t;
kdb_prev_t = t;
- if (t->state != TASK_RUNNING && new_t) {
+ if (!task_is_running(t) && new_t) {
spin_unlock(&t->sighand->siglock);
kdb_printf("Process is not RUNNING, sending a signal from "
"kdb risks deadlock\n"
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -92,8 +92,7 @@ static bool ksoftirqd_running(unsigned l
if (pending & SOFTIRQ_NOW_MASK)
return false;
- return tsk && (tsk->state == TASK_RUNNING) &&
- !__kthread_should_park(tsk);
+ return tsk && task_is_running(tsk) && !__kthread_should_park(tsk);
}
#ifdef CONFIG_TRACE_IRQFLAGS
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1955,7 +1955,7 @@ static inline bool is_via_compact_memory
static bool kswapd_is_running(pg_data_t *pgdat)
{
- return pgdat->kswapd && (pgdat->kswapd->state == TASK_RUNNING);
+ return pgdat->kswapd && task_is_running(pgdat->kswapd);
}
/*
next prev parent reply other threads:[~2021-06-11 8:34 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-11 8:28 [PATCH v2 0/7] Cleanup task_struct::state Peter Zijlstra
2021-06-11 8:28 ` [PATCH v2 1/7] sched: Unbreak wakeups Peter Zijlstra
2021-06-18 11:24 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-06-11 8:28 ` Peter Zijlstra [this message]
2021-06-11 8:49 ` [PATCH v2 2/7] sched: Introduce task_is_running() Geert Uytterhoeven
2021-06-11 9:13 ` Peter Zijlstra
2021-06-11 10:26 ` Will Deacon
2021-06-18 11:24 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-06-11 8:28 ` [PATCH v2 3/7] sched,perf,kvm: Fix preemption condition Peter Zijlstra
2021-06-18 11:24 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-06-11 8:28 ` [PATCH v2 4/7] sched: Add get_current_state() Peter Zijlstra
2021-06-18 11:24 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-06-11 8:28 ` [PATCH v2 5/7] sched,timer: Use __set_current_state() Peter Zijlstra
2021-06-18 11:24 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-06-11 8:28 ` [PATCH v2 6/7] sched,arch: Remove unused TASK_STATE offsets Peter Zijlstra
2021-06-18 11:24 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
2021-06-11 8:28 ` [PATCH v2 7/7] sched: Change task_struct::state Peter Zijlstra
2021-06-16 13:24 ` Daniel Bristot de Oliveira
2021-06-18 11:24 ` [tip: sched/core] " tip-bot2 for Peter Zijlstra
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