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tracing: Only create stacktrace option when STACKTRACE is configured

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Only create the stacktrace trace option when CONFIG_STACKTRACE is
configured.

Cleaned up the ftrace_trace_stack() function call a little to allow better
encapsulation of the stacktrace trace flag.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2015-09-29 15:38:55 -04:00 committed by Steven Rostedt
parent 8179e8a15b
commit 73dddbb57b
2 changed files with 23 additions and 14 deletions
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28
kernel/trace/trace.c
View File

@ -472,8 +472,9 @@ static inline void trace_access_lock_init(void)
static void __ftrace_trace_stack(struct ring_buffer *buffer, static void __ftrace_trace_stack(struct ring_buffer *buffer,
unsigned long flags, unsigned long flags,
int skip, int pc, struct pt_regs *regs); int skip, int pc, struct pt_regs *regs);
static void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, static inline void ftrace_trace_stack(struct ring_buffer *buffer,
int skip, int pc); unsigned long flags,
int skip, int pc, struct pt_regs *regs);
#else #else
static inline void __ftrace_trace_stack(struct ring_buffer *buffer, static inline void __ftrace_trace_stack(struct ring_buffer *buffer,
@ -482,7 +483,8 @@ static inline void __ftrace_trace_stack(struct ring_buffer *buffer,
{ {
} }
static inline void ftrace_trace_stack(struct ring_buffer *buffer, static inline void ftrace_trace_stack(struct ring_buffer *buffer,
unsigned long flags, int skip, int pc) unsigned long flags,
int skip, int pc, struct pt_regs *regs)
{ {
} }
@ -571,7 +573,7 @@ int __trace_puts(unsigned long ip, const char *str, int size)
entry->buf[size] = '\0'; entry->buf[size] = '\0';
__buffer_unlock_commit(buffer, event); __buffer_unlock_commit(buffer, event);
ftrace_trace_stack(buffer, irq_flags, 4, pc); ftrace_trace_stack(buffer, irq_flags, 4, pc, NULL);
return size; return size;
} }
@ -611,7 +613,7 @@ int __trace_bputs(unsigned long ip, const char *str)
entry->str = str; entry->str = str;
__buffer_unlock_commit(buffer, event); __buffer_unlock_commit(buffer, event);
ftrace_trace_stack(buffer, irq_flags, 4, pc); ftrace_trace_stack(buffer, irq_flags, 4, pc, NULL);
return 1; return 1;
} }
@ -1685,7 +1687,7 @@ void trace_buffer_unlock_commit(struct trace_array *tr,
{ {
__buffer_unlock_commit(buffer, event); __buffer_unlock_commit(buffer, event);
ftrace_trace_stack(buffer, flags, 6, pc); ftrace_trace_stack(buffer, flags, 6, pc, NULL);
ftrace_trace_userstack(buffer, flags, pc); ftrace_trace_userstack(buffer, flags, pc);
} }
EXPORT_SYMBOL_GPL(trace_buffer_unlock_commit); EXPORT_SYMBOL_GPL(trace_buffer_unlock_commit);
@ -1737,8 +1739,7 @@ void trace_buffer_unlock_commit_regs(struct trace_array *tr,
{ {
__buffer_unlock_commit(buffer, event); __buffer_unlock_commit(buffer, event);
if (trace_flags & TRACE_ITER_STACKTRACE) ftrace_trace_stack(buffer, flags, 6, pc, regs);
__ftrace_trace_stack(buffer, flags, 0, pc, regs);
ftrace_trace_userstack(buffer, flags, pc); ftrace_trace_userstack(buffer, flags, pc);
} }
EXPORT_SYMBOL_GPL(trace_buffer_unlock_commit_regs); EXPORT_SYMBOL_GPL(trace_buffer_unlock_commit_regs);
@ -1867,13 +1868,14 @@ static void __ftrace_trace_stack(struct ring_buffer *buffer,
} }
static void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, static inline void ftrace_trace_stack(struct ring_buffer *buffer,
int skip, int pc) unsigned long flags,
int skip, int pc, struct pt_regs *regs)
{ {
if (!(trace_flags & TRACE_ITER_STACKTRACE)) if (!(trace_flags & TRACE_ITER_STACKTRACE))
return; return;
__ftrace_trace_stack(buffer, flags, skip, pc, NULL); __ftrace_trace_stack(buffer, flags, skip, pc, regs);
} }
void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
@ -2158,7 +2160,7 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
memcpy(entry->buf, tbuffer, sizeof(u32) * len); memcpy(entry->buf, tbuffer, sizeof(u32) * len);
if (!call_filter_check_discard(call, entry, buffer, event)) { if (!call_filter_check_discard(call, entry, buffer, event)) {
__buffer_unlock_commit(buffer, event); __buffer_unlock_commit(buffer, event);
ftrace_trace_stack(buffer, flags, 6, pc); ftrace_trace_stack(buffer, flags, 6, pc, NULL);
} }
out: out:
@ -2210,7 +2212,7 @@ __trace_array_vprintk(struct ring_buffer *buffer,
memcpy(&entry->buf, tbuffer, len + 1); memcpy(&entry->buf, tbuffer, len + 1);
if (!call_filter_check_discard(call, entry, buffer, event)) { if (!call_filter_check_discard(call, entry, buffer, event)) {
__buffer_unlock_commit(buffer, event); __buffer_unlock_commit(buffer, event);
ftrace_trace_stack(buffer, flags, 6, pc); ftrace_trace_stack(buffer, flags, 6, pc, NULL);
} }
out: out:
preempt_enable_notrace(); preempt_enable_notrace();

9
kernel/trace/trace.h
View File

@ -911,6 +911,13 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
# define FUNCTION_DEFAULT_FLAGS 0UL # define FUNCTION_DEFAULT_FLAGS 0UL
#endif #endif
#ifdef CONFIG_STACKTRACE
# define STACK_FLAGS \
C(STACKTRACE, "stacktrace"),
#else
# define STACK_FLAGS
#endif
/* /*
* trace_iterator_flags is an enumeration that defines bit * trace_iterator_flags is an enumeration that defines bit
* positions into trace_flags that controls the output. * positions into trace_flags that controls the output.
@ -927,7 +934,6 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
C(HEX, "hex"), \ C(HEX, "hex"), \
C(BIN, "bin"), \ C(BIN, "bin"), \
C(BLOCK, "block"), \ C(BLOCK, "block"), \
C(STACKTRACE, "stacktrace"), \
C(PRINTK, "trace_printk"), \ C(PRINTK, "trace_printk"), \
C(ANNOTATE, "annotate"), \ C(ANNOTATE, "annotate"), \
C(USERSTACKTRACE, "userstacktrace"), \ C(USERSTACKTRACE, "userstacktrace"), \
@ -942,6 +948,7 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
C(MARKERS, "markers"), \ C(MARKERS, "markers"), \
FUNCTION_FLAGS \ FUNCTION_FLAGS \
FGRAPH_FLAGS \ FGRAPH_FLAGS \
STACK_FLAGS \
BRANCH_FLAGS BRANCH_FLAGS
/* /*