@@ -49,13 +49,6 @@ config MMU
bool
default y
-config RWSEM_GENERIC_SPINLOCK
- bool
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
- default y
-
config ARCH_HAS_ILOG2_U32
bool
default n
@@ -63,9 +63,6 @@ config SCHED_OMIT_FRAME_POINTER
config GENERIC_CSUM
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config ARCH_DISCONTIGMEM_ENABLE
def_bool n
@@ -178,10 +178,6 @@ config TRACE_IRQFLAGS_SUPPORT
bool
default !CPU_V7M
-config RWSEM_XCHGADD_ALGORITHM
- bool
- default y
-
config ARCH_HAS_ILOG2_U32
bool
@@ -237,9 +237,6 @@ config LOCKDEP_SUPPORT
config TRACE_IRQFLAGS_SUPPORT
def_bool y
-config RWSEM_XCHGADD_ALGORITHM
- def_bool y
-
config GENERIC_BUG
def_bool y
depends on BUG
@@ -27,9 +27,6 @@ config MMU
config FPU
def_bool n
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config GENERIC_CALIBRATE_DELAY
def_bool y
@@ -92,9 +92,6 @@ config GENERIC_HWEIGHT
config MMU
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config STACKTRACE_SUPPORT
def_bool y
@@ -27,9 +27,6 @@ config H8300
config CPU_BIG_ENDIAN
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config GENERIC_HWEIGHT
def_bool y
@@ -65,12 +65,6 @@ config GENERIC_CSUM
config GENERIC_IRQ_PROBE
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool n
-
-config RWSEM_XCHGADD_ALGORITHM
- def_bool y
-
config GENERIC_HWEIGHT
def_bool y
@@ -83,10 +83,6 @@ config STACKTRACE_SUPPORT
config GENERIC_LOCKBREAK
def_bool n
-config RWSEM_XCHGADD_ALGORITHM
- bool
- default y
-
config HUGETLB_PAGE_SIZE_VARIABLE
bool
depends on HUGETLB_PAGE
@@ -32,13 +32,6 @@ config M68K
config CPU_BIG_ENDIAN
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- bool
- default y
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
-
config ARCH_HAS_ILOG2_U32
bool
@@ -58,15 +58,9 @@ config CPU_LITTLE_ENDIAN
endchoice
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config ZONE_DMA
def_bool y
-config RWSEM_XCHGADD_ALGORITHM
- bool
-
config ARCH_HAS_ILOG2_U32
def_bool n
@@ -1037,13 +1037,6 @@ source "arch/mips/paravirt/Kconfig"
endmenu
-config RWSEM_GENERIC_SPINLOCK
- bool
- default y
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
-
config GENERIC_HWEIGHT
bool
default y
@@ -60,9 +60,6 @@ config GENERIC_LOCKBREAK
def_bool y
depends on PREEMPT
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config TRACE_IRQFLAGS_SUPPORT
def_bool y
@@ -40,9 +40,6 @@ config NO_IOPORT_MAP
config FPU
def_bool n
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config TRACE_IRQFLAGS_SUPPORT
def_bool n
@@ -43,12 +43,6 @@ config CPU_BIG_ENDIAN
config MMU
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
-config RWSEM_XCHGADD_ALGORITHM
- def_bool n
-
config GENERIC_HWEIGHT
def_bool y
@@ -75,12 +75,6 @@ config GENERIC_LOCKBREAK
default y
depends on SMP && PREEMPT
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
-
config ARCH_HAS_ILOG2_U32
bool
default n
@@ -103,13 +103,6 @@ config LOCKDEP_SUPPORT
bool
default y
-config RWSEM_GENERIC_SPINLOCK
- bool
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
- default y
-
config GENERIC_LOCKBREAK
bool
default y
@@ -69,9 +69,6 @@ config STACKTRACE_SUPPORT
config TRACE_IRQFLAGS_SUPPORT
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config GENERIC_BUG
def_bool y
depends on BUG
@@ -14,12 +14,6 @@ config LOCKDEP_SUPPORT
config STACKTRACE_SUPPORT
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- bool
-
-config RWSEM_XCHGADD_ALGORITHM
- def_bool y
-
config ARCH_HAS_ILOG2_U32
def_bool n
@@ -90,12 +90,6 @@ config ARCH_DEFCONFIG
default "arch/sh/configs/shx3_defconfig" if SUPERH32
default "arch/sh/configs/cayman_defconfig" if SUPERH64
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
-
config GENERIC_BUG
def_bool y
depends on BUG && SUPERH32
@@ -191,14 +191,6 @@ config NR_CPUS
source "kernel/Kconfig.hz"
-config RWSEM_GENERIC_SPINLOCK
- bool
- default y if SPARC32
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
- default y if SPARC64
-
config GENERIC_HWEIGHT
bool
default y
@@ -38,12 +38,6 @@ config STACKTRACE_SUPPORT
config LOCKDEP_SUPPORT
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
-
config ARCH_HAS_ILOG2_U32
bool
@@ -268,9 +268,6 @@ config ARCH_MAY_HAVE_PC_FDC
def_bool y
depends on ISA_DMA_API
-config RWSEM_XCHGADD_ALGORITHM
- def_bool y
-
config GENERIC_CALIBRATE_DELAY
def_bool y
@@ -32,12 +32,6 @@ config ARCH_DEFCONFIG
default "arch/um/configs/i386_defconfig" if X86_32
default "arch/um/configs/x86_64_defconfig" if X86_64
-config RWSEM_XCHGADD_ALGORITHM
- def_bool 64BIT
-
-config RWSEM_GENERIC_SPINLOCK
- def_bool !RWSEM_XCHGADD_ALGORITHM
-
config 3_LEVEL_PGTABLES
bool "Three-level pagetables" if !64BIT
default 64BIT
@@ -46,9 +46,6 @@ config XTENSA
with reasonable minimum requirements. The Xtensa Linux project has
a home page at <http://www.linux-xtensa.org/>.
-config RWSEM_XCHGADD_ALGORITHM
- def_bool y
-
config GENERIC_HWEIGHT
def_bool y
deleted file mode 100644
@@ -1,47 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* rwsem-spinlock.h: fallback C implementation
- *
- * Copyright (c) 2001 David Howells (dhowells@redhat.com).
- * - Derived partially from ideas by Andrea Arcangeli <andrea@suse.de>
- * - Derived also from comments by Linus
- */
-
-#ifndef _LINUX_RWSEM_SPINLOCK_H
-#define _LINUX_RWSEM_SPINLOCK_H
-
-#ifndef _LINUX_RWSEM_H
-#error "please don't include linux/rwsem-spinlock.h directly, use linux/rwsem.h instead"
-#endif
-
-#ifdef __KERNEL__
-/*
- * the rw-semaphore definition
- * - if count is 0 then there are no active readers or writers
- * - if count is +ve then that is the number of active readers
- * - if count is -1 then there is one active writer
- * - if wait_list is not empty, then there are processes waiting for the semaphore
- */
-struct rw_semaphore {
- __s32 count;
- raw_spinlock_t wait_lock;
- struct list_head wait_list;
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
- struct lockdep_map dep_map;
-#endif
-};
-
-#define RWSEM_UNLOCKED_VALUE 0x00000000
-
-extern void __down_read(struct rw_semaphore *sem);
-extern int __must_check __down_read_killable(struct rw_semaphore *sem);
-extern int __down_read_trylock(struct rw_semaphore *sem);
-extern void __down_write(struct rw_semaphore *sem);
-extern int __must_check __down_write_killable(struct rw_semaphore *sem);
-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);
-extern void __downgrade_write(struct rw_semaphore *sem);
-extern int rwsem_is_locked(struct rw_semaphore *sem);
-
-#endif /* __KERNEL__ */
-#endif /* _LINUX_RWSEM_SPINLOCK_H */
@@ -22,10 +22,6 @@
struct rw_semaphore;
-#ifdef CONFIG_RWSEM_GENERIC_SPINLOCK
-#include <linux/rwsem-spinlock.h> /* use a generic implementation */
-#define __RWSEM_INIT_COUNT(name) .count = RWSEM_UNLOCKED_VALUE
-#else
/* All arch specific implementations share the same struct */
struct rw_semaphore {
atomic_long_t count;
@@ -65,7 +61,6 @@ static inline int rwsem_is_locked(struct rw_semaphore *sem)
#define RWSEM_UNLOCKED_VALUE 0L
#define __RWSEM_INIT_COUNT(name) .count = ATOMIC_LONG_INIT(RWSEM_UNLOCKED_VALUE)
-#endif
/* Common initializer macros and functions */
@@ -229,7 +229,7 @@ config MUTEX_SPIN_ON_OWNER
config RWSEM_SPIN_ON_OWNER
def_bool y
- depends on SMP && RWSEM_XCHGADD_ALGORITHM && ARCH_SUPPORTS_ATOMIC_RMW
+ depends on SMP && ARCH_SUPPORTS_ATOMIC_RMW
config LOCK_SPIN_ON_OWNER
def_bool y
@@ -3,7 +3,7 @@
# and is generally not a function of system call inputs.
KCOV_INSTRUMENT := n
-obj-y += mutex.o semaphore.o rwsem.o percpu-rwsem.o
+obj-y += mutex.o semaphore.o rwsem.o percpu-rwsem.o rwsem-xadd.o
ifdef CONFIG_FUNCTION_TRACER
CFLAGS_REMOVE_lockdep.o = $(CC_FLAGS_FTRACE)
@@ -25,8 +25,6 @@ obj-$(CONFIG_RT_MUTEXES) += rtmutex.o
obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o
obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o
-obj-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
-obj-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem-xadd.o
obj-$(CONFIG_QUEUED_RWLOCKS) += qrwlock.o
obj-$(CONFIG_LOCK_TORTURE_TEST) += locktorture.o
obj-$(CONFIG_WW_MUTEX_SELFTEST) += test-ww_mutex.o
deleted file mode 100644
@@ -1,339 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* rwsem-spinlock.c: R/W semaphores: contention handling functions for
- * generic spinlock implementation
- *
- * Copyright (c) 2001 David Howells (dhowells@redhat.com).
- * - Derived partially from idea by Andrea Arcangeli <andrea@suse.de>
- * - Derived also from comments by Linus
- */
-#include <linux/rwsem.h>
-#include <linux/sched/signal.h>
-#include <linux/sched/debug.h>
-#include <linux/export.h>
-
-enum rwsem_waiter_type {
- RWSEM_WAITING_FOR_WRITE,
- RWSEM_WAITING_FOR_READ
-};
-
-struct rwsem_waiter {
- struct list_head list;
- struct task_struct *task;
- enum rwsem_waiter_type type;
-};
-
-int rwsem_is_locked(struct rw_semaphore *sem)
-{
- int ret = 1;
- unsigned long flags;
-
- if (raw_spin_trylock_irqsave(&sem->wait_lock, flags)) {
- ret = (sem->count != 0);
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
- }
- return ret;
-}
-EXPORT_SYMBOL(rwsem_is_locked);
-
-/*
- * initialise the semaphore
- */
-void __init_rwsem(struct rw_semaphore *sem, const char *name,
- struct lock_class_key *key)
-{
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
- /*
- * Make sure we are not reinitializing a held semaphore:
- */
- debug_check_no_locks_freed((void *)sem, sizeof(*sem));
- lockdep_init_map(&sem->dep_map, name, key, 0);
-#endif
- sem->count = 0;
- raw_spin_lock_init(&sem->wait_lock);
- INIT_LIST_HEAD(&sem->wait_list);
-}
-EXPORT_SYMBOL(__init_rwsem);
-
-/*
- * handle the lock release when processes blocked on it that can now run
- * - if we come here, then:
- * - the 'active count' _reached_ zero
- * - the 'waiting count' is non-zero
- * - the spinlock must be held by the caller
- * - woken process blocks are discarded from the list after having task zeroed
- * - writers are only woken if wakewrite is non-zero
- */
-static inline struct rw_semaphore *
-__rwsem_do_wake(struct rw_semaphore *sem, int wakewrite)
-{
- struct rwsem_waiter *waiter;
- struct task_struct *tsk;
- int woken;
-
- waiter = list_entry(sem->wait_list.next, struct rwsem_waiter, list);
-
- if (waiter->type == RWSEM_WAITING_FOR_WRITE) {
- if (wakewrite)
- /* Wake up a writer. Note that we do not grant it the
- * lock - it will have to acquire it when it runs. */
- wake_up_process(waiter->task);
- goto out;
- }
-
- /* grant an infinite number of read locks to the front of the queue */
- woken = 0;
- do {
- struct list_head *next = waiter->list.next;
-
- list_del(&waiter->list);
- tsk = waiter->task;
- /*
- * Make sure we do not wakeup the next reader before
- * setting the nil condition to grant the next reader;
- * otherwise we could miss the wakeup on the other
- * side and end up sleeping again. See the pairing
- * in rwsem_down_read_failed().
- */
- smp_mb();
- waiter->task = NULL;
- wake_up_process(tsk);
- put_task_struct(tsk);
- woken++;
- if (next == &sem->wait_list)
- break;
- waiter = list_entry(next, struct rwsem_waiter, list);
- } while (waiter->type != RWSEM_WAITING_FOR_WRITE);
-
- sem->count += woken;
-
- out:
- return sem;
-}
-
-/*
- * wake a single writer
- */
-static inline struct rw_semaphore *
-__rwsem_wake_one_writer(struct rw_semaphore *sem)
-{
- struct rwsem_waiter *waiter;
-
- waiter = list_entry(sem->wait_list.next, struct rwsem_waiter, list);
- wake_up_process(waiter->task);
-
- return sem;
-}
-
-/*
- * get a read lock on the semaphore
- */
-int __sched __down_read_common(struct rw_semaphore *sem, int state)
-{
- struct rwsem_waiter waiter;
- unsigned long flags;
-
- raw_spin_lock_irqsave(&sem->wait_lock, flags);
-
- if (sem->count >= 0 && list_empty(&sem->wait_list)) {
- /* granted */
- sem->count++;
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
- goto out;
- }
-
- /* set up my own style of waitqueue */
- waiter.task = current;
- waiter.type = RWSEM_WAITING_FOR_READ;
- get_task_struct(current);
-
- list_add_tail(&waiter.list, &sem->wait_list);
-
- /* wait to be given the lock */
- for (;;) {
- if (!waiter.task)
- break;
- if (signal_pending_state(state, current))
- goto out_nolock;
- set_current_state(state);
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
- schedule();
- raw_spin_lock_irqsave(&sem->wait_lock, flags);
- }
-
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
- out:
- return 0;
-
-out_nolock:
- /*
- * We didn't take the lock, so that there is a writer, which
- * is owner or the first waiter of the sem. If it's a waiter,
- * it will be woken by current owner. Not need to wake anybody.
- */
- list_del(&waiter.list);
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
- return -EINTR;
-}
-
-void __sched __down_read(struct rw_semaphore *sem)
-{
- __down_read_common(sem, TASK_UNINTERRUPTIBLE);
-}
-
-int __sched __down_read_killable(struct rw_semaphore *sem)
-{
- return __down_read_common(sem, TASK_KILLABLE);
-}
-
-/*
- * trylock for reading -- returns 1 if successful, 0 if contention
- */
-int __down_read_trylock(struct rw_semaphore *sem)
-{
- unsigned long flags;
- int ret = 0;
-
-
- raw_spin_lock_irqsave(&sem->wait_lock, flags);
-
- if (sem->count >= 0 && list_empty(&sem->wait_list)) {
- /* granted */
- sem->count++;
- ret = 1;
- }
-
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
-
- return ret;
-}
-
-/*
- * get a write lock on the semaphore
- */
-int __sched __down_write_common(struct rw_semaphore *sem, int state)
-{
- struct rwsem_waiter waiter;
- unsigned long flags;
- int ret = 0;
-
- raw_spin_lock_irqsave(&sem->wait_lock, flags);
-
- /* set up my own style of waitqueue */
- waiter.task = current;
- waiter.type = RWSEM_WAITING_FOR_WRITE;
- list_add_tail(&waiter.list, &sem->wait_list);
-
- /* wait for someone to release the lock */
- for (;;) {
- /*
- * That is the key to support write lock stealing: allows the
- * task already on CPU to get the lock soon rather than put
- * itself into sleep and waiting for system woke it or someone
- * else in the head of the wait list up.
- */
- if (sem->count == 0)
- break;
- if (signal_pending_state(state, current))
- goto out_nolock;
-
- set_current_state(state);
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
- schedule();
- raw_spin_lock_irqsave(&sem->wait_lock, flags);
- }
- /* got the lock */
- sem->count = -1;
- list_del(&waiter.list);
-
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
-
- return ret;
-
-out_nolock:
- list_del(&waiter.list);
- if (!list_empty(&sem->wait_list) && sem->count >= 0)
- __rwsem_do_wake(sem, 0);
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
-
- return -EINTR;
-}
-
-void __sched __down_write(struct rw_semaphore *sem)
-{
- __down_write_common(sem, TASK_UNINTERRUPTIBLE);
-}
-
-int __sched __down_write_killable(struct rw_semaphore *sem)
-{
- return __down_write_common(sem, TASK_KILLABLE);
-}
-
-/*
- * trylock for writing -- returns 1 if successful, 0 if contention
- */
-int __down_write_trylock(struct rw_semaphore *sem)
-{
- unsigned long flags;
- int ret = 0;
-
- raw_spin_lock_irqsave(&sem->wait_lock, flags);
-
- if (sem->count == 0) {
- /* got the lock */
- sem->count = -1;
- ret = 1;
- }
-
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
-
- return ret;
-}
-
-/*
- * release a read lock on the semaphore
- */
-void __up_read(struct rw_semaphore *sem)
-{
- unsigned long flags;
-
- raw_spin_lock_irqsave(&sem->wait_lock, flags);
-
- if (--sem->count == 0 && !list_empty(&sem->wait_list))
- sem = __rwsem_wake_one_writer(sem);
-
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
-}
-
-/*
- * release a write lock on the semaphore
- */
-void __up_write(struct rw_semaphore *sem)
-{
- unsigned long flags;
-
- raw_spin_lock_irqsave(&sem->wait_lock, flags);
-
- sem->count = 0;
- if (!list_empty(&sem->wait_list))
- sem = __rwsem_do_wake(sem, 1);
-
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
-}
-
-/*
- * downgrade a write lock into a read lock
- * - just wake up any readers at the front of the queue
- */
-void __downgrade_write(struct rw_semaphore *sem)
-{
- unsigned long flags;
-
- raw_spin_lock_irqsave(&sem->wait_lock, flags);
-
- sem->count = 1;
- if (!list_empty(&sem->wait_list))
- sem = __rwsem_do_wake(sem, 0);
-
- raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
-}
-
@@ -153,7 +153,6 @@ static inline void rwsem_clear_reader_owned(struct rw_semaphore *sem)
}
#endif
-#ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
/*
* lock for reading
*/
@@ -260,5 +259,3 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
if (tmp < 0)
rwsem_downgrade_wake(sem);
}
-
-#endif /* CONFIG_RWSEM_XCHGADD_ALGORITHM */
Currently, we have two different implementation of rwsem: 1) CONFIG_RWSEM_GENERIC_SPINLOCK (rwsem-spinlock.c) 2) CONFIG_RWSEM_XCHGADD_ALGORITHM (rwsem-xadd.c) As we are going to use a single generic implementation for rwsem-xadd.c and no architecture-specific code will be needed, there is no point in keeping two different implementations of rwsem. In most cases, the performance of rwsem-spinlock.c will be worse. It also doesn't get all the performance tuning and optimizations that had been implemented in rwsem-xadd.c over the years. For simplication, we are going to remove rwsem-spinlock.c and make all architectures use a single implementation of rwsem - rwsem-xadd.c. All references to RWSEM_GENERIC_SPINLOCK and RWSEM_XCHGADD_ALGORITHM in the code are removed. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Waiman Long <longman@redhat.com> --- arch/alpha/Kconfig | 7 - arch/arc/Kconfig | 3 - arch/arm/Kconfig | 4 - arch/arm64/Kconfig | 3 - arch/c6x/Kconfig | 3 - arch/csky/Kconfig | 3 - arch/h8300/Kconfig | 3 - arch/hexagon/Kconfig | 6 - arch/ia64/Kconfig | 4 - arch/m68k/Kconfig | 7 - arch/microblaze/Kconfig | 6 - arch/mips/Kconfig | 7 - arch/nds32/Kconfig | 3 - arch/nios2/Kconfig | 3 - arch/openrisc/Kconfig | 6 - arch/parisc/Kconfig | 6 - arch/powerpc/Kconfig | 7 - arch/riscv/Kconfig | 3 - arch/s390/Kconfig | 6 - arch/sh/Kconfig | 6 - arch/sparc/Kconfig | 8 - arch/unicore32/Kconfig | 6 - arch/x86/Kconfig | 3 - arch/x86/um/Kconfig | 6 - arch/xtensa/Kconfig | 3 - include/linux/rwsem-spinlock.h | 47 ----- include/linux/rwsem.h | 5 - kernel/Kconfig.locks | 2 +- kernel/locking/Makefile | 4 +- kernel/locking/rwsem-spinlock.c | 339 -------------------------------- kernel/locking/rwsem.h | 3 - 31 files changed, 2 insertions(+), 520 deletions(-) delete mode 100644 include/linux/rwsem-spinlock.h delete mode 100644 kernel/locking/rwsem-spinlock.c