Kirill Tkhai 0aa1125fa8 locking/rwsem-spinlock: Add killable versions of __down_read() ...

Rename __down_read() in __down_read_common() and teach it
to abort waiting in case of pending signals and killable
state argument passed.

Note, that we shouldn't wake anybody up in EINTR path, as:

We check for signal_pending_state() after (!waiter.task)
test and under spinlock. So, current task wasn't able to
be woken up. It may be in two cases: a writer is owner
of the sem, or a writer is a first waiter of the sem.

If a writer is owner of the sem, no one else may work
with it in parallel. It will wake somebody, when it
call up_write() or downgrade_write().

If a writer is the first waiter, it will be woken up,
when the last active reader releases the sem, and
sem->count became 0.

Also note, that set_current_state() may be moved down
to schedule() (after !waiter.task check), as all
assignments in this type of semaphore (including wake_up),
occur under spinlock, so we can't miss anything.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: arnd@arndb.de
Cc: avagin@virtuozzo.com
Cc: davem@davemloft.net
Cc: fenghua.yu@intel.com
Cc: gorcunov@virtuozzo.com
Cc: heiko.carstens@de.ibm.com
Cc: hpa@zytor.com
Cc: ink@jurassic.park.msu.ru
Cc: mattst88@gmail.com
Cc: rth@twiddle.net
Cc: schwidefsky@de.ibm.com
Cc: tony.luck@intel.com
Link: http://lkml.kernel.org/r/149789533283.9059.9829416940494747182.stgit@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2017-08-10 12:28:55 +02:00

..

lockdep_internals.h

sparc64: Use LOCKDEP_SMALL, not PROVE_LOCKING_SMALL

2017-04-18 13:11:07 -07:00

lockdep_proc.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

lockdep_states.h

…

lockdep.c

rcu: Remove the now-obsolete PROVE_RCU_REPEATEDLY Kconfig option

2017-06-08 18:52:41 -07:00

locktorture.c

sched/headers: Prepare for the removal of <linux/rtmutex.h> from <linux/sched.h>

2017-03-02 08:42:32 +01:00

Makefile

locking/ww_mutex: Begin kselftests for ww_mutex

2017-01-14 11:37:14 +01:00

mcs_spinlock.h

locking/core: Remove cpu_relax_lowlatency() users

2016-11-16 10:15:10 +01:00

mutex-debug.c

locking/mutex: Rework mutex::owner

2016-10-25 11:31:50 +02:00

mutex-debug.h

locking/mutex: Fix lockdep_assert_held() fail

2017-01-30 11:42:59 +01:00

mutex.c

mutex, futex: adjust kernel-doc markups to generate ReST

2017-05-16 08:43:25 -03:00

mutex.h

locking/mutex: Fix lockdep_assert_held() fail

2017-01-30 11:42:59 +01:00

osq_lock.c

locking/osq_lock: Fix osq_lock queue corruption

2017-08-10 12:28:54 +02:00

percpu-rwsem.c

locking/percpu-rwsem: Replace waitqueue with rcuwait

2017-01-14 11:14:35 +01:00

qrwlock.c

kernel/locking: Fix compile error with qrwlock.c

2017-05-25 12:06:50 -07:00

qspinlock_paravirt.h

mm: update callers to use HASH_ZERO flag

2017-07-06 16:24:33 -07:00

qspinlock_stat.h

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h>

2017-03-02 08:42:27 +01:00

qspinlock.c

locking/qspinlock: Explicitly include asm/prefetch.h

2017-07-08 11:01:11 +02:00

rtmutex_common.h

futex: Allow for compiling out PI support

2017-08-01 14:36:35 +02:00

rtmutex-debug.c

rt_mutex: Add lockdep annotations

2017-06-08 10:35:49 +02:00

rtmutex-debug.h

rt_mutex: Add lockdep annotations

2017-06-08 10:35:49 +02:00

rtmutex.c

locking/rtmutex: Remove unnecessary priority adjustment

2017-07-13 11:44:06 +02:00

rtmutex.h

rt_mutex: Add lockdep annotations

2017-06-08 10:35:49 +02:00

rwsem-spinlock.c

locking/rwsem-spinlock: Add killable versions of __down_read()

2017-08-10 12:28:55 +02:00

rwsem-xadd.c

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>

2017-03-02 08:42:34 +01:00

rwsem.c

locking/lockdep: Add new check to lock_downgrade()

2017-03-16 09:57:07 +01:00

rwsem.h

locking/rwsem: Protect all writes to owner by WRITE_ONCE()

2016-06-08 15:16:59 +02:00

semaphore.c

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>

2017-03-02 08:42:34 +01:00

spinlock_debug.c

locking/spinlock/debug: Remove spinlock lockup detection code

2017-02-10 09:09:49 +01:00

spinlock.c

locking/spinlocks: Remove the unused spin_lock_bh_nested() API

2017-01-12 09:33:39 +01:00

test-ww_mutex.c

locking/ww-mutex: Limit stress test to 2 seconds

2017-03-30 09:49:47 +02:00