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Fix userstacktrace option for instances

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While writing an application that requires user stack trace option
 to work in instances, I found that the instance option has a bug
 that makes it a nop. The check for performing the user stack trace
 in an instance, checks the top level options (not the instance options)
 to determine if a user stack trace should be performed or not.
 
 This is not only incorrect, but also confusing for users. It confused
 me for a bit!
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Merge tag 'trace-v5.10-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fix from Steven Rostedt:
 "Fix userstacktrace option for instances

  While writing an application that requires user stack trace option to
  work in instances, I found that the instance option has a bug that
  makes it a nop. The check for performing the user stack trace in an
  instance, checks the top level options (not the instance options) to
  determine if a user stack trace should be performed or not.

  This is not only incorrect, but also confusing for users. It confused
  me for a bit!"

* tag 'trace-v5.10-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Fix userstacktrace option for instances
This commit is contained in:
Linus Torvalds 2020-12-07 11:20:26 -08:00
commit cd796ed334
1 changed files with 8 additions and 5 deletions
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13
kernel/trace/trace.c
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@ -163,7 +163,8 @@ static union trace_eval_map_item *trace_eval_maps;
#endif /* CONFIG_TRACE_EVAL_MAP_FILE */
int tracing_set_tracer(struct trace_array *tr, const char *buf);
static void ftrace_trace_userstack(struct trace_buffer *buffer,
static void ftrace_trace_userstack(struct trace_array *tr,
struct trace_buffer *buffer,
unsigned long flags, int pc);
#define MAX_TRACER_SIZE 100
@ -2870,7 +2871,7 @@ void trace_buffer_unlock_commit_regs(struct trace_array *tr,
* two. They are not that meaningful.
*/
ftrace_trace_stack(tr, buffer, flags, regs ? 0 : STACK_SKIP, pc, regs);
ftrace_trace_userstack(buffer, flags, pc);
ftrace_trace_userstack(tr, buffer, flags, pc);
}
/*
@ -3056,13 +3057,14 @@ EXPORT_SYMBOL_GPL(trace_dump_stack);
static DEFINE_PER_CPU(int, user_stack_count);
static void
ftrace_trace_userstack(struct trace_buffer *buffer, unsigned long flags, int pc)
ftrace_trace_userstack(struct trace_array *tr,
struct trace_buffer *buffer, unsigned long flags, int pc)
{
struct trace_event_call *call = &event_user_stack;
struct ring_buffer_event *event;
struct userstack_entry *entry;
if (!(global_trace.trace_flags & TRACE_ITER_USERSTACKTRACE))
if (!(tr->trace_flags & TRACE_ITER_USERSTACKTRACE))
return;
/*
@ -3101,7 +3103,8 @@ ftrace_trace_userstack(struct trace_buffer *buffer, unsigned long flags, int pc)
preempt_enable();
}
#else /* CONFIG_USER_STACKTRACE_SUPPORT */
static void ftrace_trace_userstack(struct trace_buffer *buffer,
static void ftrace_trace_userstack(struct trace_array *tr,
struct trace_buffer *buffer,
unsigned long flags, int pc)
{
}