diff options
Diffstat (limited to 'kernel/rcu.h')
| -rw-r--r-- | kernel/rcu.h | 132 |
1 files changed, 0 insertions, 132 deletions
diff --git a/kernel/rcu.h b/kernel/rcu.h deleted file mode 100644 index 7859a0a3951e..000000000000 --- a/kernel/rcu.h +++ /dev/null @@ -1,132 +0,0 @@ -/* - * Read-Copy Update definitions shared among RCU implementations. - * - * 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, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - * - * Copyright IBM Corporation, 2011 - * - * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com> - */ - -#ifndef __LINUX_RCU_H -#define __LINUX_RCU_H - -#ifdef CONFIG_RCU_TRACE -#define RCU_TRACE(stmt) stmt -#else /* #ifdef CONFIG_RCU_TRACE */ -#define RCU_TRACE(stmt) -#endif /* #else #ifdef CONFIG_RCU_TRACE */ - -/* - * Process-level increment to ->dynticks_nesting field. This allows for - * architectures that use half-interrupts and half-exceptions from - * process context. - * - * DYNTICK_TASK_NEST_MASK defines a field of width DYNTICK_TASK_NEST_WIDTH - * that counts the number of process-based reasons why RCU cannot - * consider the corresponding CPU to be idle, and DYNTICK_TASK_NEST_VALUE - * is the value used to increment or decrement this field. - * - * The rest of the bits could in principle be used to count interrupts, - * but this would mean that a negative-one value in the interrupt - * field could incorrectly zero out the DYNTICK_TASK_NEST_MASK field. - * We therefore provide a two-bit guard field defined by DYNTICK_TASK_MASK - * that is set to DYNTICK_TASK_FLAG upon initial exit from idle. - * The DYNTICK_TASK_EXIT_IDLE value is thus the combined value used upon - * initial exit from idle. - */ -#define DYNTICK_TASK_NEST_WIDTH 7 -#define DYNTICK_TASK_NEST_VALUE ((LLONG_MAX >> DYNTICK_TASK_NEST_WIDTH) + 1) -#define DYNTICK_TASK_NEST_MASK (LLONG_MAX - DYNTICK_TASK_NEST_VALUE + 1) -#define DYNTICK_TASK_FLAG ((DYNTICK_TASK_NEST_VALUE / 8) * 2) -#define DYNTICK_TASK_MASK ((DYNTICK_TASK_NEST_VALUE / 8) * 3) -#define DYNTICK_TASK_EXIT_IDLE (DYNTICK_TASK_NEST_VALUE + \ - DYNTICK_TASK_FLAG) - -/* - * debug_rcu_head_queue()/debug_rcu_head_unqueue() are used internally - * by call_rcu() and rcu callback execution, and are therefore not part of the - * RCU API. Leaving in rcupdate.h because they are used by all RCU flavors. - */ - -#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD -# define STATE_RCU_HEAD_READY 0 -# define STATE_RCU_HEAD_QUEUED 1 - -extern struct debug_obj_descr rcuhead_debug_descr; - -static inline int debug_rcu_head_queue(struct rcu_head *head) -{ - int r1; - - r1 = debug_object_activate(head, &rcuhead_debug_descr); - debug_object_active_state(head, &rcuhead_debug_descr, - STATE_RCU_HEAD_READY, - STATE_RCU_HEAD_QUEUED); - return r1; -} - -static inline void debug_rcu_head_unqueue(struct rcu_head *head) -{ - debug_object_active_state(head, &rcuhead_debug_descr, - STATE_RCU_HEAD_QUEUED, - STATE_RCU_HEAD_READY); - debug_object_deactivate(head, &rcuhead_debug_descr); -} -#else /* !CONFIG_DEBUG_OBJECTS_RCU_HEAD */ -static inline int debug_rcu_head_queue(struct rcu_head *head) -{ - return 0; -} - -static inline void debug_rcu_head_unqueue(struct rcu_head *head) -{ -} -#endif /* #else !CONFIG_DEBUG_OBJECTS_RCU_HEAD */ - -extern void kfree(const void *); - -static inline bool __rcu_reclaim(const char *rn, struct rcu_head *head) -{ - unsigned long offset = (unsigned long)head->func; - - if (__is_kfree_rcu_offset(offset)) { - RCU_TRACE(trace_rcu_invoke_kfree_callback(rn, head, offset)); - kfree((void *)head - offset); - return 1; - } else { - RCU_TRACE(trace_rcu_invoke_callback(rn, head)); - head->func(head); - return 0; - } -} - -extern int rcu_expedited; - -#ifdef CONFIG_RCU_STALL_COMMON - -extern int rcu_cpu_stall_suppress; -int rcu_jiffies_till_stall_check(void); - -#endif /* #ifdef CONFIG_RCU_STALL_COMMON */ - -/* - * Strings used in tracepoints need to be exported via the - * tracing system such that tools like perf and trace-cmd can - * translate the string address pointers to actual text. - */ -#define TPS(x) tracepoint_string(x) - -#endif /* __LINUX_RCU_H */ |