diff options
Diffstat (limited to 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 59 |
1 files changed, 50 insertions, 9 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 610d21355526..1dadef445cd1 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -19,6 +19,7 @@ #include <linux/glob.h> #include <linux/irq_work.h> #include <linux/workqueue.h> +#include <linux/ctype.h> #ifdef CONFIG_FTRACE_SYSCALLS #include <asm/unistd.h> /* For NR_SYSCALLS */ @@ -98,7 +99,7 @@ enum trace_type { /* Use this for memory failure errors */ #define MEM_FAIL(condition, fmt, ...) ({ \ - static bool __section(.data.once) __warned; \ + static bool __section(".data.once") __warned; \ int __ret_warn_once = !!(condition); \ \ if (unlikely(__ret_warn_once && !__warned)) { \ @@ -246,7 +247,7 @@ typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is * passed in turn to the cond_snapshot.update() function. That data * can be compared by the update() implementation with the cond_data - * contained wihin the struct cond_snapshot instance associated with + * contained within the struct cond_snapshot instance associated with * the trace_array. Because the tr->max_lock is held throughout the * update() call, the update() function can directly retrieve the * cond_snapshot and cond_data associated with the per-instance @@ -271,7 +272,7 @@ typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); * take the snapshot, by returning 'true' if so, 'false' if no * snapshot should be taken. Because the max_lock is held for * the duration of update(), the implementation is safe to - * directly retrieven and save any implementation data it needs + * directly retrieved and save any implementation data it needs * to in association with the snapshot. */ struct cond_snapshot { @@ -573,7 +574,7 @@ struct tracer { * The function callback, which can use the FTRACE bits to * check for recursion. * - * Now if the arch does not suppport a feature, and it calls + * Now if the arch does not support a feature, and it calls * the global list function which calls the ftrace callback * all three of these steps will do a recursion protection. * There's no reason to do one if the previous caller already @@ -636,6 +637,12 @@ enum { * function is called to clear it. */ TRACE_GRAPH_NOTRACE_BIT, + + /* + * When transitioning between context, the preempt_count() may + * not be correct. Allow for a single recursion to cover this case. + */ + TRACE_TRANSITION_BIT, }; #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) @@ -690,14 +697,27 @@ static __always_inline int trace_test_and_set_recursion(int start, int max) return 0; bit = trace_get_context_bit() + start; - if (unlikely(val & (1 << bit))) - return -1; + if (unlikely(val & (1 << bit))) { + /* + * It could be that preempt_count has not been updated during + * a switch between contexts. Allow for a single recursion. + */ + bit = TRACE_TRANSITION_BIT; + if (trace_recursion_test(bit)) + return -1; + trace_recursion_set(bit); + barrier(); + return bit + 1; + } + + /* Normal check passed, clear the transition to allow it again */ + trace_recursion_clear(TRACE_TRANSITION_BIT); val |= 1 << bit; current->trace_recursion = val; barrier(); - return bit; + return bit + 1; } static __always_inline void trace_clear_recursion(int bit) @@ -707,6 +727,7 @@ static __always_inline void trace_clear_recursion(int bit) if (!bit) return; + bit--; bit = 1 << bit; val &= ~bit; @@ -737,7 +758,7 @@ struct dentry *trace_create_file(const char *name, void *data, const struct file_operations *fops); -struct dentry *tracing_init_dentry(void); +int tracing_init_dentry(void); struct ring_buffer_event; @@ -1125,6 +1146,8 @@ extern int ftrace_is_dead(void); int ftrace_create_function_files(struct trace_array *tr, struct dentry *parent); void ftrace_destroy_function_files(struct trace_array *tr); +int ftrace_allocate_ftrace_ops(struct trace_array *tr); +void ftrace_free_ftrace_ops(struct trace_array *tr); void ftrace_init_global_array_ops(struct trace_array *tr); void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); void ftrace_reset_array_ops(struct trace_array *tr); @@ -1146,6 +1169,11 @@ ftrace_create_function_files(struct trace_array *tr, { return 0; } +static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr) +{ + return 0; +} +static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { } static inline void ftrace_destroy_function_files(struct trace_array *tr) { } static inline __init void ftrace_init_global_array_ops(struct trace_array *tr) { } @@ -1472,7 +1500,7 @@ __trace_event_discard_commit(struct trace_buffer *buffer, /* * Helper function for event_trigger_unlock_commit{_regs}(). * If there are event triggers attached to this event that requires - * filtering against its fields, then they wil be called as the + * filtering against its fields, then they will be called as the * entry already holds the field information of the current event. * * It also checks if the event should be discarded or not. @@ -1651,6 +1679,7 @@ extern void trace_event_enable_tgid_record(bool enable); extern int event_trace_init(void); extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); extern int event_trace_del_tracer(struct trace_array *tr); +extern void __trace_early_add_events(struct trace_array *tr); extern struct trace_event_file *__find_event_file(struct trace_array *tr, const char *system, @@ -2082,4 +2111,16 @@ static __always_inline void trace_iterator_reset(struct trace_iterator *iter) iter->pos = -1; } +/* Check the name is good for event/group/fields */ +static inline bool is_good_name(const char *name) +{ + if (!isalpha(*name) && *name != '_') + return false; + while (*++name != '\0') { + if (!isalpha(*name) && !isdigit(*name) && *name != '_') + return false; + } + return true; +} + #endif /* _LINUX_KERNEL_TRACE_H */ |