diff options
| -rw-r--r-- | kernel/trace/trace.c | 33 | ||||
| -rw-r--r-- | kernel/trace/trace.h | 7 | ||||
| -rw-r--r-- | kernel/trace/trace_output.c | 4 |
3 files changed, 36 insertions, 8 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index a587fd7d7447..566d99f9f086 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -975,7 +975,8 @@ static inline void trace_access_lock_init(void) #endif #ifdef CONFIG_STACKTRACE -static void __ftrace_trace_stack(struct trace_buffer *buffer, +static void __ftrace_trace_stack(struct trace_array *tr, + struct trace_buffer *buffer, unsigned int trace_ctx, int skip, struct pt_regs *regs); static inline void ftrace_trace_stack(struct trace_array *tr, @@ -984,7 +985,8 @@ static inline void ftrace_trace_stack(struct trace_array *tr, int skip, struct pt_regs *regs); #else -static inline void __ftrace_trace_stack(struct trace_buffer *buffer, +static inline void __ftrace_trace_stack(struct trace_array *tr, + struct trace_buffer *buffer, unsigned int trace_ctx, int skip, struct pt_regs *regs) { @@ -2912,7 +2914,8 @@ struct ftrace_stacks { static DEFINE_PER_CPU(struct ftrace_stacks, ftrace_stacks); static DEFINE_PER_CPU(int, ftrace_stack_reserve); -static void __ftrace_trace_stack(struct trace_buffer *buffer, +static void __ftrace_trace_stack(struct trace_array *tr, + struct trace_buffer *buffer, unsigned int trace_ctx, int skip, struct pt_regs *regs) { @@ -2958,6 +2961,20 @@ static void __ftrace_trace_stack(struct trace_buffer *buffer, nr_entries = stack_trace_save(fstack->calls, size, skip); } +#ifdef CONFIG_DYNAMIC_FTRACE + /* Mark entry of stack trace as trampoline code */ + if (tr->ops && tr->ops->trampoline) { + unsigned long tramp_start = tr->ops->trampoline; + unsigned long tramp_end = tramp_start + tr->ops->trampoline_size; + unsigned long *calls = fstack->calls; + + for (int i = 0; i < nr_entries; i++) { + if (calls[i] >= tramp_start && calls[i] < tramp_end) + calls[i] = FTRACE_TRAMPOLINE_MARKER; + } + } +#endif + event = __trace_buffer_lock_reserve(buffer, TRACE_STACK, struct_size(entry, caller, nr_entries), trace_ctx); @@ -2987,7 +3004,7 @@ static inline void ftrace_trace_stack(struct trace_array *tr, if (!(tr->trace_flags & TRACE_ITER_STACKTRACE)) return; - __ftrace_trace_stack(buffer, trace_ctx, skip, regs); + __ftrace_trace_stack(tr, buffer, trace_ctx, skip, regs); } void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, @@ -2996,7 +3013,7 @@ void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, struct trace_buffer *buffer = tr->array_buffer.buffer; if (rcu_is_watching()) { - __ftrace_trace_stack(buffer, trace_ctx, skip, NULL); + __ftrace_trace_stack(tr, buffer, trace_ctx, skip, NULL); return; } @@ -3013,7 +3030,7 @@ void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, return; ct_irq_enter_irqson(); - __ftrace_trace_stack(buffer, trace_ctx, skip, NULL); + __ftrace_trace_stack(tr, buffer, trace_ctx, skip, NULL); ct_irq_exit_irqson(); } @@ -3030,8 +3047,8 @@ void trace_dump_stack(int skip) /* Skip 1 to skip this function. */ skip++; #endif - __ftrace_trace_stack(printk_trace->array_buffer.buffer, - tracing_gen_ctx(), skip, NULL); + __ftrace_trace_stack(printk_trace, printk_trace->array_buffer.buffer, + tracing_gen_ctx(), skip, NULL); } EXPORT_SYMBOL_GPL(trace_dump_stack); diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 638f452eec10..6e66b666c3e9 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -2172,4 +2172,11 @@ static inline int rv_init_interface(void) } #endif +/* + * This is used only to distinguish + * function address from trampoline code. + * So this value has no meaning. + */ +#define FTRACE_TRAMPOLINE_MARKER ((unsigned long) INT_MAX) + #endif /* _LINUX_KERNEL_TRACE_H */ diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index 2ee6613dce6d..e08aee34ef63 100644 --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -1245,6 +1245,10 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter, break; trace_seq_puts(s, " => "); + if ((*p) == FTRACE_TRAMPOLINE_MARKER) { + trace_seq_puts(s, "[FTRACE TRAMPOLINE]\n"); + continue; + } seq_print_ip_sym(s, (*p) + delta, flags); trace_seq_putc(s, '\n'); } |