cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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rcutiny.h (3356B)

      1/* SPDX-License-Identifier: GPL-2.0+ */
      2/*
      3 * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition.
      4 *
      5 * Copyright IBM Corporation, 2008
      6 *
      7 * Author: Paul E. McKenney <paulmck@linux.ibm.com>
      8 *
      9 * For detailed explanation of Read-Copy Update mechanism see -
     10 *		Documentation/RCU
     11 */
     12#ifndef __LINUX_TINY_H
     13#define __LINUX_TINY_H
     14
     15#include <asm/param.h> /* for HZ */
     16
     17unsigned long get_state_synchronize_rcu(void);
     18unsigned long start_poll_synchronize_rcu(void);
     19bool poll_state_synchronize_rcu(unsigned long oldstate);
     20
     21static inline void cond_synchronize_rcu(unsigned long oldstate)
     22{
     23	might_sleep();
     24}
     25
     26extern void rcu_barrier(void);
     27
     28static inline void synchronize_rcu_expedited(void)
     29{
     30	synchronize_rcu();
     31}
     32
     33/*
     34 * Add one more declaration of kvfree() here. It is
     35 * not so straight forward to just include <linux/mm.h>
     36 * where it is defined due to getting many compile
     37 * errors caused by that include.
     38 */
     39extern void kvfree(const void *addr);
     40
     41static inline void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
     42{
     43	if (head) {
     44		call_rcu(head, func);
     45		return;
     46	}
     47
     48	// kvfree_rcu(one_arg) call.
     49	might_sleep();
     50	synchronize_rcu();
     51	kvfree((void *) func);
     52}
     53
     54void rcu_qs(void);
     55
     56static inline void rcu_softirq_qs(void)
     57{
     58	rcu_qs();
     59}
     60
     61#define rcu_note_context_switch(preempt) \
     62	do { \
     63		rcu_qs(); \
     64		rcu_tasks_qs(current, (preempt)); \
     65	} while (0)
     66
     67static inline int rcu_needs_cpu(void)
     68{
     69	return 0;
     70}
     71
     72/*
     73 * Take advantage of the fact that there is only one CPU, which
     74 * allows us to ignore virtualization-based context switches.
     75 */
     76static inline void rcu_virt_note_context_switch(int cpu) { }
     77static inline void rcu_cpu_stall_reset(void) { }
     78static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ; }
     79static inline void rcu_idle_enter(void) { }
     80static inline void rcu_idle_exit(void) { }
     81static inline void rcu_irq_enter(void) { }
     82static inline void rcu_irq_exit_irqson(void) { }
     83static inline void rcu_irq_enter_irqson(void) { }
     84static inline void rcu_irq_exit(void) { }
     85static inline void rcu_irq_exit_check_preempt(void) { }
     86#define rcu_is_idle_cpu(cpu) \
     87	(is_idle_task(current) && !in_nmi() && !in_hardirq() && !in_serving_softirq())
     88static inline void exit_rcu(void) { }
     89static inline bool rcu_preempt_need_deferred_qs(struct task_struct *t)
     90{
     91	return false;
     92}
     93static inline void rcu_preempt_deferred_qs(struct task_struct *t) { }
     94#ifdef CONFIG_SRCU
     95void rcu_scheduler_starting(void);
     96#else /* #ifndef CONFIG_SRCU */
     97static inline void rcu_scheduler_starting(void) { }
     98#endif /* #else #ifndef CONFIG_SRCU */
     99static inline void rcu_end_inkernel_boot(void) { }
    100static inline bool rcu_inkernel_boot_has_ended(void) { return true; }
    101static inline bool rcu_is_watching(void) { return true; }
    102static inline void rcu_momentary_dyntick_idle(void) { }
    103static inline void kfree_rcu_scheduler_running(void) { }
    104static inline bool rcu_gp_might_be_stalled(void) { return false; }
    105
    106/* Avoid RCU read-side critical sections leaking across. */
    107static inline void rcu_all_qs(void) { barrier(); }
    108
    109/* RCUtree hotplug events */
    110#define rcutree_prepare_cpu      NULL
    111#define rcutree_online_cpu       NULL
    112#define rcutree_offline_cpu      NULL
    113#define rcutree_dead_cpu         NULL
    114#define rcutree_dying_cpu        NULL
    115static inline void rcu_cpu_starting(unsigned int cpu) { }
    116
    117#endif /* __LINUX_RCUTINY_H */