[tip:sched/core] sched, cleanup, treewide: Remove set_current_state(TASK_RUNNING) after schedule()

From: tip-bot for Kirill Tkhai
Date: Fri Sep 19 2014 - 07:47:29 EST

Commit-ID: f139caf2e89713687514d9db847a4fa2e29c87a2
Gitweb: http://git.kernel.org/tip/f139caf2e89713687514d9db847a4fa2e29c87a2
Author: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
AuthorDate: Fri, 12 Sep 2014 17:40:54 +0400
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Fri, 19 Sep 2014 12:35:17 +0200

sched, cleanup, treewide: Remove set_current_state(TASK_RUNNING) after schedule()

schedule(), io_schedule() and schedule_timeout() always return
with TASK_RUNNING state set, so one more setting is unnecessary.

(All places in patch are visible good, only exception is
kiblnd_scheduler() from:

drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c

Its schedule() is one line above standard 3 lines of unified diff)

No places where set_current_state() is used for mb().

Signed-off-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1410529254.3569.23.camel@tkhai
Cc: Alasdair Kergon <agk@xxxxxxxxxx>
Cc: Anil Belur <askb23@xxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Dave Kleikamp <shaggy@xxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Dmitry Eremin <dmitry.eremin@xxxxxxxxx>
Cc: Frank Blaschka <blaschka@xxxxxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: Isaac Huang <he.huang@xxxxxxxxx>
Cc: James E.J. Bottomley <JBottomley@xxxxxxxxxxxxx>
Cc: James E.J. Bottomley <jejb@xxxxxxxxxxxxxxxx>
Cc: J. Bruce Fields <bfields@xxxxxxxxxxxx>
Cc: Jeff Dike <jdike@xxxxxxxxxxx>
Cc: Jesper Nilsson <jesper.nilsson@xxxxxxxx>
Cc: Jiri Slaby <jslaby@xxxxxxx>
Cc: Laura Abbott <lauraa@xxxxxxxxxxxxxx>
Cc: Liang Zhen <liang.zhen@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Masaru Nomura <massa.nomura@xxxxxxxxx>
Cc: Michael Opdenacker <michael.opdenacker@xxxxxxxxxxxxxxxxxx>
Cc: Mikael Starvik <starvik@xxxxxxxx>
Cc: Mike Snitzer <snitzer@xxxxxxxxxx>
Cc: Neil Brown <neilb@xxxxxxx>
Cc: Oleg Drokin <green@xxxxxxxxxxxxxx>
Cc: Peng Tao <bergwolf@xxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: Robert Love <robert.w.love@xxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Cc: Ursula Braun <ursula.braun@xxxxxxxxxx>
Cc: Zi Shen Lim <zlim.lnx@xxxxxxxxx>
Cc: devel@xxxxxxxxxxxxxxxxxxxx
Cc: dm-devel@xxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: fcoe-devel@xxxxxxxxxxxxx
Cc: jfs-discussion@xxxxxxxxxxxxxxxxxxxxx
Cc: linux390@xxxxxxxxxx
Cc: linux-afs@xxxxxxxxxxxxxxxxxxx
Cc: linux-cris-kernel@xxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-nfs@xxxxxxxxxxxxxxx
Cc: linux-parisc@xxxxxxxxxxxxxxx
Cc: linux-raid@xxxxxxxxxxxxxxx
Cc: linux-s390@xxxxxxxxxxxxxxx
Cc: linux-scsi@xxxxxxxxxxxxxxx
Cc: qla2xxx-upstream@xxxxxxxxxx
Cc: user-mode-linux-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: user-mode-linux-user@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/cris/arch-v10/drivers/sync_serial.c | 1 -
arch/cris/arch-v32/drivers/sync_serial.c | 1 -
arch/um/drivers/random.c | 1 -
drivers/gpu/vga/vgaarb.c | 1 -
drivers/md/dm-bufio.c | 1 -
drivers/parisc/power.c | 1 -
drivers/s390/net/claw.c | 2 --
drivers/scsi/fcoe/fcoe.c | 1 -
drivers/scsi/qla2xxx/qla_os.c | 1 -
drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c | 3 ---
drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c | 1 -
drivers/staging/lustre/lustre/libcfs/fail.c | 1 -
drivers/tty/bfin_jtag_comm.c | 1 -
fs/afs/vlocation.c | 1 -
fs/jfs/jfs_logmgr.c | 2 --
fs/jfs/jfs_txnmgr.c | 3 ---
fs/nfs/blocklayout/blocklayoutdev.c | 1 -
fs/nfs/blocklayout/blocklayoutdm.c | 1 -
fs/nfsd/nfs4recover.c | 1 -
kernel/time/hrtimer.c | 1 -
kernel/trace/ring_buffer_benchmark.c | 3 ---
21 files changed, 29 deletions(-)

diff --git a/arch/cris/arch-v10/drivers/sync_serial.c b/arch/cris/arch-v10/drivers/sync_serial.c
index 29eb02a..0f39832 100644
--- a/arch/cris/arch-v10/drivers/sync_serial.c
+++ b/arch/cris/arch-v10/drivers/sync_serial.c
@@ -1086,7 +1086,6 @@ static ssize_t sync_serial_write(struct file *file, const char *buf,
}
local_irq_restore(flags);
schedule();
- set_current_state(TASK_RUNNING);
remove_wait_queue(&port->out_wait_q, &wait);
if (signal_pending(current))
return -EINTR;
diff --git a/arch/cris/arch-v32/drivers/sync_serial.c b/arch/cris/arch-v32/drivers/sync_serial.c
index bbb806b..5a14913 100644
--- a/arch/cris/arch-v32/drivers/sync_serial.c
+++ b/arch/cris/arch-v32/drivers/sync_serial.c
@@ -1089,7 +1089,6 @@ static ssize_t sync_serial_write(struct file *file, const char *buf,
}

schedule();
- set_current_state(TASK_RUNNING);
remove_wait_queue(&port->out_wait_q, &wait);

if (signal_pending(current))
diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c
index 9e3a722..dd16c90 100644
--- a/arch/um/drivers/random.c
+++ b/arch/um/drivers/random.c
@@ -79,7 +79,6 @@ static ssize_t rng_dev_read (struct file *filp, char __user *buf, size_t size,
set_task_state(current, TASK_INTERRUPTIBLE);

schedule();
- set_task_state(current, TASK_RUNNING);
remove_wait_queue(&host_read_wait, &wait);

if (atomic_dec_and_test(&host_sleep_count)) {
diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index d2077f0..d07f810 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -403,7 +403,6 @@ int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible)
}
schedule();
remove_wait_queue(&vga_wait_queue, &wait);
- set_current_state(TASK_RUNNING);
}
return rc;
}
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index ab472c5..0505559 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -720,7 +720,6 @@ static void __wait_for_free_buffer(struct dm_bufio_client *c)

io_schedule();

- set_task_state(current, TASK_RUNNING);
remove_wait_queue(&c->free_buffer_wait, &wait);

dm_bufio_lock(c);
diff --git a/drivers/parisc/power.c b/drivers/parisc/power.c
index 90cca5e..ef31b77 100644
--- a/drivers/parisc/power.c
+++ b/drivers/parisc/power.c
@@ -121,7 +121,6 @@ static int kpowerswd(void *param)
unsigned long soft_power_reg = (unsigned long) param;

schedule_timeout_interruptible(pwrsw_enabled ? HZ : HZ/POWERSWITCH_POLL_PER_SEC);
- __set_current_state(TASK_RUNNING);

if (unlikely(!pwrsw_enabled))
continue;
diff --git a/drivers/s390/net/claw.c b/drivers/s390/net/claw.c
index fbc6701..213e54e 100644
--- a/drivers/s390/net/claw.c
+++ b/drivers/s390/net/claw.c
@@ -481,7 +481,6 @@ claw_open(struct net_device *dev)
spin_unlock_irqrestore(
get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
schedule();
- set_current_state(TASK_RUNNING);
remove_wait_queue(&privptr->channel[i].wait, &wait);
if(rc != 0)
ccw_check_return_code(privptr->channel[i].cdev, rc);
@@ -828,7 +827,6 @@ claw_release(struct net_device *dev)
spin_unlock_irqrestore(
get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
schedule();
- set_current_state(TASK_RUNNING);
remove_wait_queue(&privptr->channel[i].wait, &wait);
if (rc != 0) {
ccw_check_return_code(privptr->channel[i].cdev, rc);
diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index 00ee0ed..4a8ac7d 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -1884,7 +1884,6 @@ retry:
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_bh(&p->fcoe_rx_list.lock);
schedule();
- set_current_state(TASK_RUNNING);
goto retry;
}

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index be9698d..8b5a5dc 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -4853,7 +4853,6 @@ qla2x00_do_dpc(void *data)
"DPC handler sleeping.\n");

schedule();
- __set_current_state(TASK_RUNNING);

if (!base_vha->flags.init_done || ha->flags.mbox_busy)
goto end_loop;
diff --git a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
index 306d728..b94f743 100644
--- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
+++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
@@ -3215,7 +3215,6 @@ kiblnd_connd (void *arg)

schedule_timeout(timeout);

- set_current_state(TASK_RUNNING);
remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
}
@@ -3432,7 +3431,6 @@ kiblnd_scheduler(void *arg)
busy_loops = 0;

remove_wait_queue(&sched->ibs_waitq, &wait);
- set_current_state(TASK_RUNNING);
spin_lock_irqsave(&sched->ibs_lock, flags);
}

@@ -3507,7 +3505,6 @@ kiblnd_failover_thread(void *arg)

rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
cfs_time_seconds(1));
- set_current_state(TASK_RUNNING);
remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
write_lock_irqsave(glock, flags);

diff --git a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c
index 5214399..9994fc6 100644
--- a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c
+++ b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c
@@ -2233,7 +2233,6 @@ ksocknal_connd (void *arg)
nloops = 0;
schedule_timeout(timeout);

- set_current_state(TASK_RUNNING);
remove_wait_queue(&ksocknal_data.ksnd_connd_waitq, &wait);
spin_lock_bh(connd_lock);
}
diff --git a/drivers/staging/lustre/lustre/libcfs/fail.c b/drivers/staging/lustre/lustre/libcfs/fail.c
index 1bf9c90..e73ca3d 100644
--- a/drivers/staging/lustre/lustre/libcfs/fail.c
+++ b/drivers/staging/lustre/lustre/libcfs/fail.c
@@ -131,7 +131,6 @@ int __cfs_fail_timeout_set(__u32 id, __u32 value, int ms, int set)
id, ms);
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(cfs_time_seconds(ms) / 1000);
- set_current_state(TASK_RUNNING);
CERROR("cfs_fail_timeout id %x awake\n", id);
}
return ret;
diff --git a/drivers/tty/bfin_jtag_comm.c b/drivers/tty/bfin_jtag_comm.c
index 8096fcb..d7b198c 100644
--- a/drivers/tty/bfin_jtag_comm.c
+++ b/drivers/tty/bfin_jtag_comm.c
@@ -77,7 +77,6 @@ bfin_jc_emudat_manager(void *arg)
pr_debug("waiting for readers\n");
__set_current_state(TASK_UNINTERRUPTIBLE);
schedule();
- __set_current_state(TASK_RUNNING);
continue;
}

diff --git a/fs/afs/vlocation.c b/fs/afs/vlocation.c
index b6df2e8..5297678 100644
--- a/fs/afs/vlocation.c
+++ b/fs/afs/vlocation.c
@@ -130,7 +130,6 @@ static int afs_vlocation_access_vl_by_id(struct afs_vlocation *vl,
/* second+ BUSY - sleep a little bit */
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(1);
- __set_current_state(TASK_RUNNING);
}
continue;
}
diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c
index 0acddf6..bc462dc 100644
--- a/fs/jfs/jfs_logmgr.c
+++ b/fs/jfs/jfs_logmgr.c
@@ -1585,7 +1585,6 @@ void jfs_flush_journal(struct jfs_log *log, int wait)
set_current_state(TASK_UNINTERRUPTIBLE);
LOGGC_UNLOCK(log);
schedule();
- __set_current_state(TASK_RUNNING);
LOGGC_LOCK(log);
remove_wait_queue(&target->gcwait, &__wait);
}
@@ -2359,7 +2358,6 @@ int jfsIOWait(void *arg)
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irq(&log_redrive_lock);
schedule();
- __set_current_state(TASK_RUNNING);
}
} while (!kthread_should_stop());

diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
index 564c4f2..d595856 100644
--- a/fs/jfs/jfs_txnmgr.c
+++ b/fs/jfs/jfs_txnmgr.c
@@ -136,7 +136,6 @@ static inline void TXN_SLEEP_DROP_LOCK(wait_queue_head_t * event)
set_current_state(TASK_UNINTERRUPTIBLE);
TXN_UNLOCK();
io_schedule();
- __set_current_state(TASK_RUNNING);
remove_wait_queue(event, &wait);
}

@@ -2808,7 +2807,6 @@ int jfs_lazycommit(void *arg)
set_current_state(TASK_INTERRUPTIBLE);
LAZY_UNLOCK(flags);
schedule();
- __set_current_state(TASK_RUNNING);
remove_wait_queue(&jfs_commit_thread_wait, &wq);
}
} while (!kthread_should_stop());
@@ -2996,7 +2994,6 @@ int jfs_sync(void *arg)
set_current_state(TASK_INTERRUPTIBLE);
TXN_UNLOCK();
schedule();
- __set_current_state(TASK_RUNNING);
}
} while (!kthread_should_stop());

diff --git a/fs/nfs/blocklayout/blocklayoutdev.c b/fs/nfs/blocklayout/blocklayoutdev.c
index 04303b5..9fde840 100644
--- a/fs/nfs/blocklayout/blocklayoutdev.c
+++ b/fs/nfs/blocklayout/blocklayoutdev.c
@@ -146,7 +146,6 @@ nfs4_blk_decode_device(struct nfs_server *server,

set_current_state(TASK_UNINTERRUPTIBLE);
schedule();
- __set_current_state(TASK_RUNNING);
remove_wait_queue(&nn->bl_wq, &wq);

if (reply->status != BL_DEVICE_REQUEST_PROC) {
diff --git a/fs/nfs/blocklayout/blocklayoutdm.c b/fs/nfs/blocklayout/blocklayoutdm.c
index 8999cfd..b18680e 100644
--- a/fs/nfs/blocklayout/blocklayoutdm.c
+++ b/fs/nfs/blocklayout/blocklayoutdm.c
@@ -76,7 +76,6 @@ static void dev_remove(struct net *net, dev_t dev)

set_current_state(TASK_UNINTERRUPTIBLE);
schedule();
- __set_current_state(TASK_RUNNING);
remove_wait_queue(&nn->bl_wq, &wq);

out:
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 9c271f4..8f1af78 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -670,7 +670,6 @@ __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
}

schedule();
- set_current_state(TASK_RUNNING);

if (msg.errno < 0)
ret = msg.errno;
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 1c2fe7d..ab370ff 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1776,7 +1776,6 @@ schedule_hrtimeout_range_clock(ktime_t *expires, unsigned long delta,
*/
if (!expires) {
schedule();
- __set_current_state(TASK_RUNNING);
return -EINTR;
}

diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c
index 0434ff1..3f9e328 100644
--- a/kernel/trace/ring_buffer_benchmark.c
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -205,7 +205,6 @@ static void ring_buffer_consumer(void)
break;

schedule();
- __set_current_state(TASK_RUNNING);
}
reader_finish = 0;
complete(&read_done);
@@ -379,7 +378,6 @@ static int ring_buffer_consumer_thread(void *arg)
break;

schedule();
- __set_current_state(TASK_RUNNING);
}
__set_current_state(TASK_RUNNING);

@@ -407,7 +405,6 @@ static int ring_buffer_producer_thread(void *arg)
trace_printk("Sleeping for 10 secs\n");
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(HZ * SLEEP_TIME);
- __set_current_state(TASK_RUNNING);
}

if (kill_test)
--
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