diff options
Diffstat (limited to 'include')
-rw-r--r-- | include/asm-generic/vmlinux.lds.h | 7 | ||||
-rw-r--r-- | include/linux/debugobjects.h | 6 | ||||
-rw-r--r-- | include/linux/ftrace_event.h | 34 | ||||
-rw-r--r-- | include/linux/jiffies.h | 8 | ||||
-rw-r--r-- | include/linux/rculist.h | 5 | ||||
-rw-r--r-- | include/linux/rcupdate.h | 26 | ||||
-rw-r--r-- | include/trace/events/rcu.h | 82 |
7 files changed, 111 insertions, 57 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 69732d279e8b..83e2c31e8b00 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -122,8 +122,12 @@ #define TRACE_PRINTKS() VMLINUX_SYMBOL(__start___trace_bprintk_fmt) = .; \ *(__trace_printk_fmt) /* Trace_printk fmt' pointer */ \ VMLINUX_SYMBOL(__stop___trace_bprintk_fmt) = .; +#define TRACEPOINT_STR() VMLINUX_SYMBOL(__start___tracepoint_str) = .; \ + *(__tracepoint_str) /* Trace_printk fmt' pointer */ \ + VMLINUX_SYMBOL(__stop___tracepoint_str) = .; #else #define TRACE_PRINTKS() +#define TRACEPOINT_STR() #endif #ifdef CONFIG_FTRACE_SYSCALLS @@ -190,7 +194,8 @@ VMLINUX_SYMBOL(__stop___verbose) = .; \ LIKELY_PROFILE() \ BRANCH_PROFILE() \ - TRACE_PRINTKS() + TRACE_PRINTKS() \ + TRACEPOINT_STR() /* * Data section helpers diff --git a/include/linux/debugobjects.h b/include/linux/debugobjects.h index 0e5f5785d9f2..98ffcbd4888e 100644 --- a/include/linux/debugobjects.h +++ b/include/linux/debugobjects.h @@ -63,7 +63,7 @@ struct debug_obj_descr { extern void debug_object_init (void *addr, struct debug_obj_descr *descr); extern void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr); -extern void debug_object_activate (void *addr, struct debug_obj_descr *descr); +extern int debug_object_activate (void *addr, struct debug_obj_descr *descr); extern void debug_object_deactivate(void *addr, struct debug_obj_descr *descr); extern void debug_object_destroy (void *addr, struct debug_obj_descr *descr); extern void debug_object_free (void *addr, struct debug_obj_descr *descr); @@ -85,8 +85,8 @@ static inline void debug_object_init (void *addr, struct debug_obj_descr *descr) { } static inline void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) { } -static inline void -debug_object_activate (void *addr, struct debug_obj_descr *descr) { } +static inline int +debug_object_activate (void *addr, struct debug_obj_descr *descr) { return 0; } static inline void debug_object_deactivate(void *addr, struct debug_obj_descr *descr) { } static inline void diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h index 120d57a1c3a5..5eaa746735ff 100644 --- a/include/linux/ftrace_event.h +++ b/include/linux/ftrace_event.h @@ -359,6 +359,40 @@ do { \ __trace_printk(ip, fmt, ##args); \ } while (0) +/** + * tracepoint_string - register constant persistent string to trace system + * @str - a constant persistent string that will be referenced in tracepoints + * + * If constant strings are being used in tracepoints, it is faster and + * more efficient to just save the pointer to the string and reference + * that with a printf "%s" instead of saving the string in the ring buffer + * and wasting space and time. + * + * The problem with the above approach is that userspace tools that read + * the binary output of the trace buffers do not have access to the string. + * Instead they just show the address of the string which is not very + * useful to users. + * + * With tracepoint_string(), the string will be registered to the tracing + * system and exported to userspace via the debugfs/tracing/printk_formats + * file that maps the string address to the string text. This way userspace + * tools that read the binary buffers have a way to map the pointers to + * the ASCII strings they represent. + * + * The @str used must be a constant string and persistent as it would not + * make sense to show a string that no longer exists. But it is still fine + * to be used with modules, because when modules are unloaded, if they + * had tracepoints, the ring buffers are cleared too. As long as the string + * does not change during the life of the module, it is fine to use + * tracepoint_string() within a module. + */ +#define tracepoint_string(str) \ + ({ \ + static const char *___tp_str __tracepoint_string = str; \ + ___tp_str; \ + }) +#define __tracepoint_string __attribute__((section("__tracepoint_str"))) + #ifdef CONFIG_PERF_EVENTS struct perf_event; diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h index 97ba4e78a37e..d235e88cfd7c 100644 --- a/include/linux/jiffies.h +++ b/include/linux/jiffies.h @@ -101,13 +101,13 @@ static inline u64 get_jiffies_64(void) #define time_after(a,b) \ (typecheck(unsigned long, a) && \ typecheck(unsigned long, b) && \ - ((long)(b) - (long)(a) < 0)) + ((long)((b) - (a)) < 0)) #define time_before(a,b) time_after(b,a) #define time_after_eq(a,b) \ (typecheck(unsigned long, a) && \ typecheck(unsigned long, b) && \ - ((long)(a) - (long)(b) >= 0)) + ((long)((a) - (b)) >= 0)) #define time_before_eq(a,b) time_after_eq(b,a) /* @@ -130,13 +130,13 @@ static inline u64 get_jiffies_64(void) #define time_after64(a,b) \ (typecheck(__u64, a) && \ typecheck(__u64, b) && \ - ((__s64)(b) - (__s64)(a) < 0)) + ((__s64)((b) - (a)) < 0)) #define time_before64(a,b) time_after64(b,a) #define time_after_eq64(a,b) \ (typecheck(__u64, a) && \ typecheck(__u64, b) && \ - ((__s64)(a) - (__s64)(b) >= 0)) + ((__s64)((a) - (b)) >= 0)) #define time_before_eq64(a,b) time_after_eq64(b,a) #define time_in_range64(a, b, c) \ diff --git a/include/linux/rculist.h b/include/linux/rculist.h index f4b1001a4676..4106721c4e5e 100644 --- a/include/linux/rculist.h +++ b/include/linux/rculist.h @@ -267,8 +267,9 @@ static inline void list_splice_init_rcu(struct list_head *list, */ #define list_first_or_null_rcu(ptr, type, member) \ ({struct list_head *__ptr = (ptr); \ - struct list_head __rcu *__next = list_next_rcu(__ptr); \ - likely(__ptr != __next) ? container_of(__next, type, member) : NULL; \ + struct list_head *__next = ACCESS_ONCE(__ptr->next); \ + likely(__ptr != __next) ? \ + list_entry_rcu(__next, type, member) : NULL; \ }) /** diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 4b14bdc911d7..f1f1bc39346b 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -52,7 +52,7 @@ extern int rcutorture_runnable; /* for sysctl */ #if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) extern void rcutorture_record_test_transition(void); extern void rcutorture_record_progress(unsigned long vernum); -extern void do_trace_rcu_torture_read(char *rcutorturename, +extern void do_trace_rcu_torture_read(const char *rcutorturename, struct rcu_head *rhp, unsigned long secs, unsigned long c_old, @@ -65,7 +65,7 @@ static inline void rcutorture_record_progress(unsigned long vernum) { } #ifdef CONFIG_RCU_TRACE -extern void do_trace_rcu_torture_read(char *rcutorturename, +extern void do_trace_rcu_torture_read(const char *rcutorturename, struct rcu_head *rhp, unsigned long secs, unsigned long c_old, @@ -229,13 +229,9 @@ extern void rcu_irq_exit(void); #ifdef CONFIG_RCU_USER_QS extern void rcu_user_enter(void); extern void rcu_user_exit(void); -extern void rcu_user_enter_after_irq(void); -extern void rcu_user_exit_after_irq(void); #else static inline void rcu_user_enter(void) { } static inline void rcu_user_exit(void) { } -static inline void rcu_user_enter_after_irq(void) { } -static inline void rcu_user_exit_after_irq(void) { } static inline void rcu_user_hooks_switch(struct task_struct *prev, struct task_struct *next) { } #endif /* CONFIG_RCU_USER_QS */ @@ -1015,4 +1011,22 @@ static inline bool rcu_is_nocb_cpu(int cpu) { return false; } #endif /* #else #ifdef CONFIG_RCU_NOCB_CPU */ +/* Only for use by adaptive-ticks code. */ +#ifdef CONFIG_NO_HZ_FULL_SYSIDLE +extern bool rcu_sys_is_idle(void); +extern void rcu_sysidle_force_exit(void); +#else /* #ifdef CONFIG_NO_HZ_FULL_SYSIDLE */ + +static inline bool rcu_sys_is_idle(void) +{ + return false; +} + +static inline void rcu_sysidle_force_exit(void) +{ +} + +#endif /* #else #ifdef CONFIG_NO_HZ_FULL_SYSIDLE */ + + #endif /* __LINUX_RCUPDATE_H */ diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h index 59ebcc89f148..ee2376cfaab3 100644 --- a/include/trace/events/rcu.h +++ b/include/trace/events/rcu.h @@ -19,12 +19,12 @@ */ TRACE_EVENT(rcu_utilization, - TP_PROTO(char *s), + TP_PROTO(const char *s), TP_ARGS(s), TP_STRUCT__entry( - __field(char *, s) + __field(const char *, s) ), TP_fast_assign( @@ -51,14 +51,14 @@ TRACE_EVENT(rcu_utilization, */ TRACE_EVENT(rcu_grace_period, - TP_PROTO(char *rcuname, unsigned long gpnum, char *gpevent), + TP_PROTO(const char *rcuname, unsigned long gpnum, const char *gpevent), TP_ARGS(rcuname, gpnum, gpevent), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(unsigned long, gpnum) - __field(char *, gpevent) + __field(const char *, gpevent) ), TP_fast_assign( @@ -89,21 +89,21 @@ TRACE_EVENT(rcu_grace_period, */ TRACE_EVENT(rcu_future_grace_period, - TP_PROTO(char *rcuname, unsigned long gpnum, unsigned long completed, + TP_PROTO(const char *rcuname, unsigned long gpnum, unsigned long completed, unsigned long c, u8 level, int grplo, int grphi, - char *gpevent), + const char *gpevent), TP_ARGS(rcuname, gpnum, completed, c, level, grplo, grphi, gpevent), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(unsigned long, gpnum) __field(unsigned long, completed) __field(unsigned long, c) __field(u8, level) __field(int, grplo) __field(int, grphi) - __field(char *, gpevent) + __field(const char *, gpevent) ), TP_fast_assign( @@ -132,13 +132,13 @@ TRACE_EVENT(rcu_future_grace_period, */ TRACE_EVENT(rcu_grace_period_init, - TP_PROTO(char *rcuname, unsigned long gpnum, u8 level, + TP_PROTO(const char *rcuname, unsigned long gpnum, u8 level, int grplo, int grphi, unsigned long qsmask), TP_ARGS(rcuname, gpnum, level, grplo, grphi, qsmask), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(unsigned long, gpnum) __field(u8, level) __field(int, grplo) @@ -168,12 +168,12 @@ TRACE_EVENT(rcu_grace_period_init, */ TRACE_EVENT(rcu_preempt_task, - TP_PROTO(char *rcuname, int pid, unsigned long gpnum), + TP_PROTO(const char *rcuname, int pid, unsigned long gpnum), TP_ARGS(rcuname, pid, gpnum), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(unsigned long, gpnum) __field(int, pid) ), @@ -195,12 +195,12 @@ TRACE_EVENT(rcu_preempt_task, */ TRACE_EVENT(rcu_unlock_preempted_task, - TP_PROTO(char *rcuname, unsigned long gpnum, int pid), + TP_PROTO(const char *rcuname, unsigned long gpnum, int pid), TP_ARGS(rcuname, gpnum, pid), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(unsigned long, gpnum) __field(int, pid) ), @@ -224,14 +224,14 @@ TRACE_EVENT(rcu_unlock_preempted_task, */ TRACE_EVENT(rcu_quiescent_state_report, - TP_PROTO(char *rcuname, unsigned long gpnum, + TP_PROTO(const char *rcuname, unsigned long gpnum, unsigned long mask, unsigned long qsmask, u8 level, int grplo, int grphi, int gp_tasks), TP_ARGS(rcuname, gpnum, mask, qsmask, level, grplo, grphi, gp_tasks), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(unsigned long, gpnum) __field(unsigned long, mask) __field(unsigned long, qsmask) @@ -268,15 +268,15 @@ TRACE_EVENT(rcu_quiescent_state_report, */ TRACE_EVENT(rcu_fqs, - TP_PROTO(char *rcuname, unsigned long gpnum, int cpu, char *qsevent), + TP_PROTO(const char *rcuname, unsigned long gpnum, int cpu, const char *qsevent), TP_ARGS(rcuname, gpnum, cpu, qsevent), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(unsigned long, gpnum) __field(int, cpu) - __field(char *, qsevent) + __field(const char *, qsevent) ), TP_fast_assign( @@ -308,12 +308,12 @@ TRACE_EVENT(rcu_fqs, */ TRACE_EVENT(rcu_dyntick, - TP_PROTO(char *polarity, long long oldnesting, long long newnesting), + TP_PROTO(const char *polarity, long long oldnesting, long long newnesting), TP_ARGS(polarity, oldnesting, newnesting), TP_STRUCT__entry( - __field(char *, polarity) + __field(const char *, polarity) __field(long long, oldnesting) __field(long long, newnesting) ), @@ -352,12 +352,12 @@ TRACE_EVENT(rcu_dyntick, */ TRACE_EVENT(rcu_prep_idle, - TP_PROTO(char *reason), + TP_PROTO(const char *reason), TP_ARGS(reason), TP_STRUCT__entry( - __field(char *, reason) + __field(const char *, reason) ), TP_fast_assign( @@ -376,13 +376,13 @@ TRACE_EVENT(rcu_prep_idle, */ TRACE_EVENT(rcu_callback, - TP_PROTO(char *rcuname, struct rcu_head *rhp, long qlen_lazy, + TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen_lazy, long qlen), TP_ARGS(rcuname, rhp, qlen_lazy, qlen), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(void *, rhp) __field(void *, func) __field(long, qlen_lazy) @@ -412,13 +412,13 @@ TRACE_EVENT(rcu_callback, */ TRACE_EVENT(rcu_kfree_callback, - TP_PROTO(char *rcuname, struct rcu_head *rhp, unsigned long offset, + TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset, long qlen_lazy, long qlen), TP_ARGS(rcuname, rhp, offset, qlen_lazy, qlen), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(void *, rhp) __field(unsigned long, offset) __field(long, qlen_lazy) @@ -447,12 +447,12 @@ TRACE_EVENT(rcu_kfree_callback, */ TRACE_EVENT(rcu_batch_start, - TP_PROTO(char *rcuname, long qlen_lazy, long qlen, long blimit), + TP_PROTO(const char *rcuname, long qlen_lazy, long qlen, long blimit), TP_ARGS(rcuname, qlen_lazy, qlen, blimit), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(long, qlen_lazy) __field(long, qlen) __field(long, blimit) @@ -477,12 +477,12 @@ TRACE_EVENT(rcu_batch_start, */ TRACE_EVENT(rcu_invoke_callback, - TP_PROTO(char *rcuname, struct rcu_head *rhp), + TP_PROTO(const char *rcuname, struct rcu_head *rhp), TP_ARGS(rcuname, rhp), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(void *, rhp) __field(void *, func) ), @@ -506,12 +506,12 @@ TRACE_EVENT(rcu_invoke_callback, */ TRACE_EVENT(rcu_invoke_kfree_callback, - TP_PROTO(char *rcuname, struct rcu_head *rhp, unsigned long offset), + TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset), TP_ARGS(rcuname, rhp, offset), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(void *, rhp) __field(unsigned long, offset) ), @@ -539,13 +539,13 @@ TRACE_EVENT(rcu_invoke_kfree_callback, */ TRACE_EVENT(rcu_batch_end, - TP_PROTO(char *rcuname, int callbacks_invoked, + TP_PROTO(const char *rcuname, int callbacks_invoked, bool cb, bool nr, bool iit, bool risk), TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk), TP_STRUCT__entry( - __field(char *, rcuname) + __field(const char *, rcuname) __field(int, callbacks_invoked) __field(bool, cb) __field(bool, nr) @@ -577,13 +577,13 @@ TRACE_EVENT(rcu_batch_end, */ TRACE_EVENT(rcu_torture_read, - TP_PROTO(char *rcutorturename, struct rcu_head *rhp, + TP_PROTO(const char *rcutorturename, struct rcu_head *rhp, unsigned long secs, unsigned long c_old, unsigned long c), TP_ARGS(rcutorturename, rhp, secs, c_old, c), TP_STRUCT__entry( - __field(char *, rcutorturename) + __field(const char *, rcutorturename) __field(struct rcu_head *, rhp) __field(unsigned long, secs) __field(unsigned long, c_old) @@ -623,13 +623,13 @@ TRACE_EVENT(rcu_torture_read, */ TRACE_EVENT(rcu_barrier, - TP_PROTO(char *rcuname, char *s, int cpu, int cnt, unsigned long done), + TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done), TP_ARGS(rcuname, s, cpu, cnt, done), TP_STRUCT__entry( - __field(char *, rcuname) - __field(char *, s) + __field(const char *, rcuname) + __field(const char *, s) __field(int, cpu) __field(int, cnt) __field(unsigned long, done) |