locking/spinlocks: Remove the unused spin_lock_bh_nested() API

The spin_lock_bh_nested() API is defined but is not used anywhere
in the kernel. So all spin_lock_bh_nested() and related APIs are
now removed.

Signed-off-by: Waiman Long <longman@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1483975612-16447-1-git-send-email-longman@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 47dd0ce..59248dc 100644 (file)
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -180,8 +180,6 @@ static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 # define raw_spin_lock_nested(lock, subclass) \
        _raw_spin_lock_nested(lock, subclass)
-# define raw_spin_lock_bh_nested(lock, subclass) \
-       _raw_spin_lock_bh_nested(lock, subclass)
 
 # define raw_spin_lock_nest_lock(lock, nest_lock)                      \
         do {                                                           \
@@ -197,7 +195,6 @@ static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
 # define raw_spin_lock_nested(lock, subclass)          \
        _raw_spin_lock(((void)(subclass), (lock)))
 # define raw_spin_lock_nest_lock(lock, nest_lock)      _raw_spin_lock(lock)
-# define raw_spin_lock_bh_nested(lock, subclass)       _raw_spin_lock_bh(lock)
 #endif
 
 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
@@ -317,11 +314,6 @@ do {                                                               \
        raw_spin_lock_nested(spinlock_check(lock), subclass);   \
 } while (0)
 
-#define spin_lock_bh_nested(lock, subclass)                    \
-do {                                                           \
-       raw_spin_lock_bh_nested(spinlock_check(lock), subclass);\
-} while (0)
-
 #define spin_lock_nest_lock(lock, nest_lock)                           \
 do {                                                                   \
        raw_spin_lock_nest_lock(spinlock_check(lock), nest_lock);       \

diff --git a/include/linux/spinlock_api_smp.h b/include/linux/spinlock_api_smp.h
index 5344268..42dfab8 100644 (file)
--- a/include/linux/spinlock_api_smp.h
+++ b/include/linux/spinlock_api_smp.h
@@ -22,8 +22,6 @@ int in_lock_functions(unsigned long addr);
 void __lockfunc _raw_spin_lock(raw_spinlock_t *lock)           __acquires(lock);
 void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
                                                                __acquires(lock);
-void __lockfunc _raw_spin_lock_bh_nested(raw_spinlock_t *lock, int subclass)
-                                                               __acquires(lock);
 void __lockfunc
 _raw_spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map)
                                                                __acquires(lock);

diff --git a/include/linux/spinlock_api_up.h b/include/linux/spinlock_api_up.h
index d3afef9..d0d1888 100644 (file)
--- a/include/linux/spinlock_api_up.h
+++ b/include/linux/spinlock_api_up.h
@@ -57,7 +57,6 @@
 
 #define _raw_spin_lock(lock)                   __LOCK(lock)
 #define _raw_spin_lock_nested(lock, subclass)  __LOCK(lock)
-#define _raw_spin_lock_bh_nested(lock, subclass) __LOCK(lock)
 #define _raw_read_lock(lock)                   __LOCK(lock)
 #define _raw_write_lock(lock)                  __LOCK(lock)
 #define _raw_spin_lock_bh(lock)                        __LOCK_BH(lock)

diff --git a/kernel/locking/spinlock.c b/kernel/locking/spinlock.c
index db3ccb1..4b082b5 100644 (file)
--- a/kernel/locking/spinlock.c
+++ b/kernel/locking/spinlock.c
@@ -363,14 +363,6 @@ void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
 }
 EXPORT_SYMBOL(_raw_spin_lock_nested);
 
-void __lockfunc _raw_spin_lock_bh_nested(raw_spinlock_t *lock, int subclass)
-{
-       __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
-       spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
-       LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
-}
-EXPORT_SYMBOL(_raw_spin_lock_bh_nested);
-
 unsigned long __lockfunc _raw_spin_lock_irqsave_nested(raw_spinlock_t *lock,
                                                   int subclass)
 {