Re: [PATCHv3 4/6] tty/lockdep: Add ldisc_sem asserts

From: Peter Zijlstra <peterz@infradead.org>
To: Dmitry Safonov <dima@arista.com>
Cc: linux-kernel@vger.kernel.org,
	"Dmitry Safonov" <0x7f454c46@gmail.com>,
	"Daniel Axtens" <dja@axtens.net>,
	"Dmitry Vyukov" <dvyukov@google.com>,
	"Michael Neuling" <mikey@neuling.org>,
	"Mikulas Patocka" <mpatocka@redhat.com>,
	"Nathan March" <nathan@gt.net>, "Pasi Kärkkäinen" <pasik@iki.fi>,
	"Peter Hurley" <peter@hurleysoftware.com>,
	"Rong, Chen" <rong.a.chen@intel.com>,
	"Sergey Senozhatsky" <sergey.senozhatsky.work@gmail.com>,
	"Tan Xiaojun" <tanxiaojun@huawei.com>,
	"Tetsuo Handa" <penguin-kernel@I-love.SAKURA.ne.jp>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Jiri Slaby" <jslaby@suse.com>
Subject: Re: [PATCHv3 4/6] tty/lockdep: Add ldisc_sem asserts
Date: Tue, 11 Sep 2018 13:59:32 +0200	[thread overview]
Message-ID: <20180911115932.GA19234@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20180911014821.26286-5-dima@arista.com>

Subject: tty/ldsem: Convert to regular lockdep annotations

For some reason ldsem has its own lockdep wrappers, make them go away.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 drivers/tty/tty_ldsem.c | 51 ++++++++++++++-----------------------------------
 1 file changed, 14 insertions(+), 37 deletions(-)

diff --git a/drivers/tty/tty_ldsem.c b/drivers/tty/tty_ldsem.c
index 0c98d88f795a..60beada5be6c 100644
--- a/drivers/tty/tty_ldsem.c
+++ b/drivers/tty/tty_ldsem.c
@@ -34,29 +34,6 @@
 #include <linux/sched/task.h>
 
 
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-# define __acq(l, s, t, r, c, n, i)		\
-				lock_acquire(&(l)->dep_map, s, t, r, c, n, i)
-# define __rel(l, n, i)				\
-				lock_release(&(l)->dep_map, n, i)
-#define lockdep_acquire(l, s, t, i)		__acq(l, s, t, 0, 1, NULL, i)
-#define lockdep_acquire_nest(l, s, t, n, i)	__acq(l, s, t, 0, 1, n, i)
-#define lockdep_acquire_read(l, s, t, i)	__acq(l, s, t, 1, 1, NULL, i)
-#define lockdep_release(l, n, i)		__rel(l, n, i)
-#else
-# define lockdep_acquire(l, s, t, i)		do { } while (0)
-# define lockdep_acquire_nest(l, s, t, n, i)	do { } while (0)
-# define lockdep_acquire_read(l, s, t, i)	do { } while (0)
-# define lockdep_release(l, n, i)		do { } while (0)
-#endif
-
-#ifdef CONFIG_LOCK_STAT
-# define lock_stat(_lock, stat)		lock_##stat(&(_lock)->dep_map, _RET_IP_)
-#else
-# define lock_stat(_lock, stat)		do { } while (0)
-#endif
-
-
 #if BITS_PER_LONG == 64
 # define LDSEM_ACTIVE_MASK	0xffffffffL
 #else
@@ -310,17 +287,17 @@ static int __ldsem_down_read_nested(struct ld_semaphore *sem,
 {
 	long count;
 
-	lockdep_acquire_read(sem, subclass, 0, _RET_IP_);
+	rwsem_acquire_read(&sem->dep_map, subclass, 0, _RET_IP_);
 
 	count = atomic_long_add_return(LDSEM_READ_BIAS, &sem->count);
 	if (count <= 0) {
-		lock_stat(sem, contended);
+		lock_contended(&sem->dep_map, _RET_IP_);
 		if (!down_read_failed(sem, count, timeout)) {
-			lockdep_release(sem, 1, _RET_IP_);
+			rwsem_release(&sem->dep_map, 1, _RET_IP_);
 			return 0;
 		}
 	}
-	lock_stat(sem, acquired);
+	lock_acquired(&sem->dep_map, _RET_IP_);
 	return 1;
 }
 
@@ -329,17 +306,17 @@ static int __ldsem_down_write_nested(struct ld_semaphore *sem,
 {
 	long count;
 
-	lockdep_acquire(sem, subclass, 0, _RET_IP_);
+	rwsem_acquire(&sem->dep_map, subclass, 0, _RET_IP_);
 
 	count = atomic_long_add_return(LDSEM_WRITE_BIAS, &sem->count);
 	if ((count & LDSEM_ACTIVE_MASK) != LDSEM_ACTIVE_BIAS) {
-		lock_stat(sem, contended);
+		lock_contended(&sem->dep_map, _RET_IP_);
 		if (!down_write_failed(sem, count, timeout)) {
-			lockdep_release(sem, 1, _RET_IP_);
+			rwsem_release(&sem->dep_map, 1, _RET_IP_);
 			return 0;
 		}
 	}
-	lock_stat(sem, acquired);
+	lock_acquired(&sem->dep_map, _RET_IP_);
 	return 1;
 }
 
@@ -362,8 +339,8 @@ int ldsem_down_read_trylock(struct ld_semaphore *sem)
 
 	while (count >= 0) {
 		if (atomic_long_try_cmpxchg(&sem->count, &count, count + LDSEM_READ_BIAS)) {
-			lockdep_acquire_read(sem, 0, 1, _RET_IP_);
-			lock_stat(sem, acquired);
+			rwsem_acquire_read(&sem->dep_map, 0, 1, _RET_IP_);
+			lock_acquired(&sem->dep_map, _RET_IP_);
 			return 1;
 		}
 	}
@@ -388,8 +365,8 @@ int ldsem_down_write_trylock(struct ld_semaphore *sem)
 
 	while ((count & LDSEM_ACTIVE_MASK) == 0) {
 		if (atomic_long_try_cmpxchg(&sem->count, &count, count + LDSEM_WRITE_BIAS)) {
-			lockdep_acquire(sem, 0, 1, _RET_IP_);
-			lock_stat(sem, acquired);
+			rwsem_acquire(&sem->dep_map, 0, 1, _RET_IP_);
+			lock_acquired(&sem->dep_map, _RET_IP_);
 			return 1;
 		}
 	}
@@ -403,7 +380,7 @@ void ldsem_up_read(struct ld_semaphore *sem)
 {
 	long count;
 
-	lockdep_release(sem, 1, _RET_IP_);
+	rwsem_release(&sem->dep_map, 1, _RET_IP_);
 
 	count = atomic_long_add_return(-LDSEM_READ_BIAS, &sem->count);
 	if (count < 0 && (count & LDSEM_ACTIVE_MASK) == 0)
@@ -417,7 +394,7 @@ void ldsem_up_write(struct ld_semaphore *sem)
 {
 	long count;
 
-	lockdep_release(sem, 1, _RET_IP_);
+	rwsem_release(&sem->dep_map, 1, _RET_IP_);
 
 	count = atomic_long_add_return(-LDSEM_WRITE_BIAS, &sem->count);
 	if (count < 0)
