mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 17:18:05 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
254
include/linux/srcu.h
Normal file
254
include/linux/srcu.h
Normal file
|
|
@ -0,0 +1,254 @@
|
|||
/*
|
||||
* Sleepable Read-Copy Update mechanism for mutual exclusion
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, you can access it online at
|
||||
* http://www.gnu.org/licenses/gpl-2.0.html.
|
||||
*
|
||||
* Copyright (C) IBM Corporation, 2006
|
||||
* Copyright (C) Fujitsu, 2012
|
||||
*
|
||||
* Author: Paul McKenney <paulmck@us.ibm.com>
|
||||
* Lai Jiangshan <laijs@cn.fujitsu.com>
|
||||
*
|
||||
* For detailed explanation of Read-Copy Update mechanism see -
|
||||
* Documentation/RCU/ *.txt
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef _LINUX_SRCU_H
|
||||
#define _LINUX_SRCU_H
|
||||
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/rcupdate.h>
|
||||
#include <linux/workqueue.h>
|
||||
|
||||
struct srcu_struct_array {
|
||||
unsigned long c[2];
|
||||
unsigned long seq[2];
|
||||
};
|
||||
|
||||
struct rcu_batch {
|
||||
struct rcu_head *head, **tail;
|
||||
};
|
||||
|
||||
#define RCU_BATCH_INIT(name) { NULL, &(name.head) }
|
||||
|
||||
struct srcu_struct {
|
||||
unsigned completed;
|
||||
struct srcu_struct_array __percpu *per_cpu_ref;
|
||||
spinlock_t queue_lock; /* protect ->batch_queue, ->running */
|
||||
bool running;
|
||||
/* callbacks just queued */
|
||||
struct rcu_batch batch_queue;
|
||||
/* callbacks try to do the first check_zero */
|
||||
struct rcu_batch batch_check0;
|
||||
/* callbacks done with the first check_zero and the flip */
|
||||
struct rcu_batch batch_check1;
|
||||
struct rcu_batch batch_done;
|
||||
struct delayed_work work;
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
struct lockdep_map dep_map;
|
||||
#endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
|
||||
};
|
||||
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
|
||||
int __init_srcu_struct(struct srcu_struct *sp, const char *name,
|
||||
struct lock_class_key *key);
|
||||
|
||||
#define init_srcu_struct(sp) \
|
||||
({ \
|
||||
static struct lock_class_key __srcu_key; \
|
||||
\
|
||||
__init_srcu_struct((sp), #sp, &__srcu_key); \
|
||||
})
|
||||
|
||||
#define __SRCU_DEP_MAP_INIT(srcu_name) .dep_map = { .name = #srcu_name },
|
||||
#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
|
||||
|
||||
int init_srcu_struct(struct srcu_struct *sp);
|
||||
|
||||
#define __SRCU_DEP_MAP_INIT(srcu_name)
|
||||
#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
|
||||
|
||||
void process_srcu(struct work_struct *work);
|
||||
|
||||
#define __SRCU_STRUCT_INIT(name) \
|
||||
{ \
|
||||
.completed = -300, \
|
||||
.per_cpu_ref = &name##_srcu_array, \
|
||||
.queue_lock = __SPIN_LOCK_UNLOCKED(name.queue_lock), \
|
||||
.running = false, \
|
||||
.batch_queue = RCU_BATCH_INIT(name.batch_queue), \
|
||||
.batch_check0 = RCU_BATCH_INIT(name.batch_check0), \
|
||||
.batch_check1 = RCU_BATCH_INIT(name.batch_check1), \
|
||||
.batch_done = RCU_BATCH_INIT(name.batch_done), \
|
||||
.work = __DELAYED_WORK_INITIALIZER(name.work, process_srcu, 0),\
|
||||
__SRCU_DEP_MAP_INIT(name) \
|
||||
}
|
||||
|
||||
/*
|
||||
* define and init a srcu struct at build time.
|
||||
* dont't call init_srcu_struct() nor cleanup_srcu_struct() on it.
|
||||
*/
|
||||
#define DEFINE_SRCU(name) \
|
||||
static DEFINE_PER_CPU(struct srcu_struct_array, name##_srcu_array);\
|
||||
struct srcu_struct name = __SRCU_STRUCT_INIT(name);
|
||||
|
||||
#define DEFINE_STATIC_SRCU(name) \
|
||||
static DEFINE_PER_CPU(struct srcu_struct_array, name##_srcu_array);\
|
||||
static struct srcu_struct name = __SRCU_STRUCT_INIT(name);
|
||||
|
||||
/**
|
||||
* call_srcu() - Queue a callback for invocation after an SRCU grace period
|
||||
* @sp: srcu_struct in queue the callback
|
||||
* @head: structure to be used for queueing the SRCU callback.
|
||||
* @func: function to be invoked after the SRCU grace period
|
||||
*
|
||||
* The callback function will be invoked some time after a full SRCU
|
||||
* grace period elapses, in other words after all pre-existing SRCU
|
||||
* read-side critical sections have completed. However, the callback
|
||||
* function might well execute concurrently with other SRCU read-side
|
||||
* critical sections that started after call_srcu() was invoked. SRCU
|
||||
* read-side critical sections are delimited by srcu_read_lock() and
|
||||
* srcu_read_unlock(), and may be nested.
|
||||
*
|
||||
* The callback will be invoked from process context, but must nevertheless
|
||||
* be fast and must not block.
|
||||
*/
|
||||
void call_srcu(struct srcu_struct *sp, struct rcu_head *head,
|
||||
void (*func)(struct rcu_head *head));
|
||||
|
||||
void cleanup_srcu_struct(struct srcu_struct *sp);
|
||||
int __srcu_read_lock(struct srcu_struct *sp) __acquires(sp);
|
||||
void __srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp);
|
||||
void synchronize_srcu(struct srcu_struct *sp);
|
||||
void synchronize_srcu_expedited(struct srcu_struct *sp);
|
||||
long srcu_batches_completed(struct srcu_struct *sp);
|
||||
void srcu_barrier(struct srcu_struct *sp);
|
||||
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
|
||||
/**
|
||||
* srcu_read_lock_held - might we be in SRCU read-side critical section?
|
||||
*
|
||||
* If CONFIG_DEBUG_LOCK_ALLOC is selected, returns nonzero iff in an SRCU
|
||||
* read-side critical section. In absence of CONFIG_DEBUG_LOCK_ALLOC,
|
||||
* this assumes we are in an SRCU read-side critical section unless it can
|
||||
* prove otherwise.
|
||||
*
|
||||
* Checks debug_lockdep_rcu_enabled() to prevent false positives during boot
|
||||
* and while lockdep is disabled.
|
||||
*
|
||||
* Note that SRCU is based on its own statemachine and it doesn't
|
||||
* relies on normal RCU, it can be called from the CPU which
|
||||
* is in the idle loop from an RCU point of view or offline.
|
||||
*/
|
||||
static inline int srcu_read_lock_held(struct srcu_struct *sp)
|
||||
{
|
||||
if (!debug_lockdep_rcu_enabled())
|
||||
return 1;
|
||||
return lock_is_held(&sp->dep_map);
|
||||
}
|
||||
|
||||
#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
|
||||
|
||||
static inline int srcu_read_lock_held(struct srcu_struct *sp)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
|
||||
|
||||
/**
|
||||
* srcu_dereference_check - fetch SRCU-protected pointer for later dereferencing
|
||||
* @p: the pointer to fetch and protect for later dereferencing
|
||||
* @sp: pointer to the srcu_struct, which is used to check that we
|
||||
* really are in an SRCU read-side critical section.
|
||||
* @c: condition to check for update-side use
|
||||
*
|
||||
* If PROVE_RCU is enabled, invoking this outside of an RCU read-side
|
||||
* critical section will result in an RCU-lockdep splat, unless @c evaluates
|
||||
* to 1. The @c argument will normally be a logical expression containing
|
||||
* lockdep_is_held() calls.
|
||||
*/
|
||||
#define srcu_dereference_check(p, sp, c) \
|
||||
__rcu_dereference_check((p), srcu_read_lock_held(sp) || (c), __rcu)
|
||||
|
||||
/**
|
||||
* srcu_dereference - fetch SRCU-protected pointer for later dereferencing
|
||||
* @p: the pointer to fetch and protect for later dereferencing
|
||||
* @sp: pointer to the srcu_struct, which is used to check that we
|
||||
* really are in an SRCU read-side critical section.
|
||||
*
|
||||
* Makes rcu_dereference_check() do the dirty work. If PROVE_RCU
|
||||
* is enabled, invoking this outside of an RCU read-side critical
|
||||
* section will result in an RCU-lockdep splat.
|
||||
*/
|
||||
#define srcu_dereference(p, sp) srcu_dereference_check((p), (sp), 0)
|
||||
|
||||
/**
|
||||
* srcu_read_lock - register a new reader for an SRCU-protected structure.
|
||||
* @sp: srcu_struct in which to register the new reader.
|
||||
*
|
||||
* Enter an SRCU read-side critical section. Note that SRCU read-side
|
||||
* critical sections may be nested. However, it is illegal to
|
||||
* call anything that waits on an SRCU grace period for the same
|
||||
* srcu_struct, whether directly or indirectly. Please note that
|
||||
* one way to indirectly wait on an SRCU grace period is to acquire
|
||||
* a mutex that is held elsewhere while calling synchronize_srcu() or
|
||||
* synchronize_srcu_expedited().
|
||||
*
|
||||
* Note that srcu_read_lock() and the matching srcu_read_unlock() must
|
||||
* occur in the same context, for example, it is illegal to invoke
|
||||
* srcu_read_unlock() in an irq handler if the matching srcu_read_lock()
|
||||
* was invoked in process context.
|
||||
*/
|
||||
static inline int srcu_read_lock(struct srcu_struct *sp) __acquires(sp)
|
||||
{
|
||||
int retval = __srcu_read_lock(sp);
|
||||
|
||||
rcu_lock_acquire(&(sp)->dep_map);
|
||||
return retval;
|
||||
}
|
||||
|
||||
/**
|
||||
* srcu_read_unlock - unregister a old reader from an SRCU-protected structure.
|
||||
* @sp: srcu_struct in which to unregister the old reader.
|
||||
* @idx: return value from corresponding srcu_read_lock().
|
||||
*
|
||||
* Exit an SRCU read-side critical section.
|
||||
*/
|
||||
static inline void srcu_read_unlock(struct srcu_struct *sp, int idx)
|
||||
__releases(sp)
|
||||
{
|
||||
rcu_lock_release(&(sp)->dep_map);
|
||||
__srcu_read_unlock(sp, idx);
|
||||
}
|
||||
|
||||
/**
|
||||
* smp_mb__after_srcu_read_unlock - ensure full ordering after srcu_read_unlock
|
||||
*
|
||||
* Converts the preceding srcu_read_unlock into a two-way memory barrier.
|
||||
*
|
||||
* Call this after srcu_read_unlock, to guarantee that all memory operations
|
||||
* that occur after smp_mb__after_srcu_read_unlock will appear to happen after
|
||||
* the preceding srcu_read_unlock.
|
||||
*/
|
||||
static inline void smp_mb__after_srcu_read_unlock(void)
|
||||
{
|
||||
/* __srcu_read_unlock has smp_mb() internally so nothing to do here. */
|
||||
}
|
||||
|
||||
#endif
|
||||
Loading…
Add table
Add a link
Reference in a new issue