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locking/rwsem: Get rid of __down_write_nested() 

This is no longer used anywhere and all callers (__down_write()) use
0 as a subclass. Ditch __down_write_nested() to make the code easier
to follow.

This shouldn't introduce any functional change.

Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Chris Zankel <chris@zankel.net>
Cc: David S. Miller <davem@davemloft.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Signed-off-by: Jason Low <jason.low2@hp.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-alpha@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-ia64@vger.kernel.org
Cc: linux-s390@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Cc: linux-xtensa@linux-xtensa.org
Cc: sparclinux@vger.kernel.org
Link: http://lkml.kernel.org/r/1460041951-22347-2-git-send-email-mhocko@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Michal Hocko 2016-04-07 17:12:21 +02:00 committed by Ingo Molnar
parent 1c74a7f812
commit f8e04d8545
7 changed files with 5 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/s390/include/asm/rwsem.h
View File

@ -90,7 +90,7 @@ static inline int __down_read_trylock(struct rw_semaphore *sem)
/*
* lock for writing
*/
static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
static inline void __down_write(struct rw_semaphore *sem)
{
signed long old, new, tmp;
@ -108,11 +108,6 @@ static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
rwsem_down_write_failed(sem);
}
static inline void __down_write(struct rw_semaphore *sem)
{
__down_write_nested(sem, 0);
}
/*
* trylock for writing -- returns 1 if successful, 0 if contention
*/

5
arch/sh/include/asm/rwsem.h
View File

@ -114,11 +114,6 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
rwsem_downgrade_wake(sem);
}
static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
{
__down_write(sem);
}
/*
* implement exchange and add functionality
*/

7
arch/sparc/include/asm/rwsem.h
View File

@ -45,7 +45,7 @@ static inline int __down_read_trylock(struct rw_semaphore *sem)
/*
* lock for writing
*/
static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
static inline void __down_write(struct rw_semaphore *sem)
{
long tmp;
@ -55,11 +55,6 @@ static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
rwsem_down_write_failed(sem);
}
static inline void __down_write(struct rw_semaphore *sem)
{
__down_write_nested(sem, 0);
}
static inline int __down_write_trylock(struct rw_semaphore *sem)
{
long tmp;

7
arch/x86/include/asm/rwsem.h
View File

@ -99,7 +99,7 @@ static inline int __down_read_trylock(struct rw_semaphore *sem)
/*
* lock for writing
*/
static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
static inline void __down_write(struct rw_semaphore *sem)
{
long tmp;
asm volatile("# beginning down_write\n\t"
@ -116,11 +116,6 @@ static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
: "memory", "cc");
}
static inline void __down_write(struct rw_semaphore *sem)
{
__down_write_nested(sem, 0);
}
/*
* trylock for writing -- returns 1 if successful, 0 if contention
*/

7
include/asm-generic/rwsem.h
View File

@ -53,7 +53,7 @@ static inline int __down_read_trylock(struct rw_semaphore *sem)
/*
* lock for writing
*/
static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
static inline void __down_write(struct rw_semaphore *sem)
{
long tmp;
@ -63,11 +63,6 @@ static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
rwsem_down_write_failed(sem);
}
static inline void __down_write(struct rw_semaphore *sem)
{
__down_write_nested(sem, 0);
}
static inline int __down_write_trylock(struct rw_semaphore *sem)
{
long tmp;

1
include/linux/rwsem-spinlock.h
View File

@ -34,7 +34,6 @@ struct rw_semaphore {
extern void __down_read(struct rw_semaphore *sem);
extern int __down_read_trylock(struct rw_semaphore *sem);
extern void __down_write(struct rw_semaphore *sem);
extern void __down_write_nested(struct rw_semaphore *sem, int subclass);
extern int __down_write_trylock(struct rw_semaphore *sem);
extern void __up_read(struct rw_semaphore *sem);
extern void __up_write(struct rw_semaphore *sem);

7
kernel/locking/rwsem-spinlock.c
View File

@ -191,7 +191,7 @@ int __down_read_trylock(struct rw_semaphore *sem)
/*
* get a write lock on the semaphore
*/
void __sched __down_write_nested(struct rw_semaphore *sem, int subclass)
void __sched __down_write(struct rw_semaphore *sem)
{
struct rwsem_waiter waiter;
struct task_struct *tsk;
@ -227,11 +227,6 @@ void __sched __down_write_nested(struct rw_semaphore *sem, int subclass)
raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
}
void __sched __down_write(struct rw_semaphore *sem)
{
__down_write_nested(sem, 0);
}
/*
* trylock for writing -- returns 1 if successful, 0 if contention
*/