diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-07-03 23:15:31 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-08-31 01:02:47 +0200 |
| commit | 358be2d3685cb0cca49c914e89824467ee0b589c (patch) | |
| tree | 8550a9ff71b678eb75705ad5b74236f62fee1343 /kernel/rcu/tree.h | |
| parent | rcu: Express Tiny RCU updates in terms of RCU rather than RCU-sched (diff) | |
| download | linux-358be2d3685cb0cca49c914e89824467ee0b589c.tar.xz linux-358be2d3685cb0cca49c914e89824467ee0b589c.zip | |
rcu: Remove RCU_STATE_INITIALIZER()
Now that a given build of the Linux kernel has only one set of rcu_state,
rcu_node, and rcu_data structures, there is no point in creating a macro
to declare and compile-time initialize them. This commit therefore
just does normal declaration and compile-time initialization of these
structures. While in the area, this commit also removes #ifndefs of
the no-longer-ever-defined preprocessor macro RCU_TREE_NONCORE.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/tree.h')
| -rw-r--r-- | kernel/rcu/tree.h | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 38658ca87dcb..3f36562d3118 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -386,7 +386,6 @@ struct rcu_state { #define RCU_GP_CLEANUP 7 /* Grace-period cleanup started. */ #define RCU_GP_CLEANED 8 /* Grace-period cleanup complete. */ -#ifndef RCU_TREE_NONCORE static const char * const gp_state_names[] = { "RCU_GP_IDLE", "RCU_GP_WAIT_GPS", @@ -398,7 +397,29 @@ static const char * const gp_state_names[] = { "RCU_GP_CLEANUP", "RCU_GP_CLEANED", }; -#endif /* #ifndef RCU_TREE_NONCORE */ + +/* + * In order to export the rcu_state name to the tracing tools, it + * needs to be added in the __tracepoint_string section. + * This requires defining a separate variable tp_<sname>_varname + * that points to the string being used, and this will allow + * the tracing userspace tools to be able to decipher the string + * address to the matching string. + */ +#ifdef CONFIG_PREEMPT_RCU +#define RCU_ABBR 'p' +#define RCU_NAME_RAW "rcu_preempt" +#else /* #ifdef CONFIG_PREEMPT_RCU */ +#define RCU_ABBR 's' +#define RCU_NAME_RAW "rcu_sched" +#endif /* #else #ifdef CONFIG_PREEMPT_RCU */ +#ifndef CONFIG_TRACING +#define RCU_NAME RCU_NAME_RAW +#else /* #ifdef CONFIG_TRACING */ +static char rcu_name[] = RCU_NAME_RAW; +static const char *tp_rcu_varname __used __tracepoint_string = rcu_name; +#define RCU_NAME rcu_name +#endif /* #else #ifdef CONFIG_TRACING */ extern struct list_head rcu_struct_flavors; @@ -426,8 +447,6 @@ DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_loops); DECLARE_PER_CPU(char, rcu_cpu_has_work); #endif /* #ifdef CONFIG_RCU_BOOST */ -#ifndef RCU_TREE_NONCORE - /* Forward declarations for rcutree_plugin.h */ static void rcu_bootup_announce(void); static void rcu_qs(void); @@ -495,5 +514,3 @@ void srcu_offline_cpu(unsigned int cpu); void srcu_online_cpu(unsigned int cpu) { } void srcu_offline_cpu(unsigned int cpu) { } #endif /* #else #ifdef CONFIG_SRCU */ - -#endif /* #ifndef RCU_TREE_NONCORE */ |