Piteball
/
android_kernel_samsung_msm8976
mirror of https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
1
1
Fork 0
Code Issues Projects Releases Wiki Activity

tracing: Have branch tracer use recursive field of task struct 

commit 6224beb12e190ff11f3c7d4bf50cb2922878f600 upstream.

Fengguang Wu's tests triggered a bug in the branch tracer's start up
test when CONFIG_DEBUG_PREEMPT set. This was because that config
adds some debug logic in the per cpu field, which calls back into
the branch tracer.

The branch tracer has its own recursive checks, but uses a per cpu
variable to implement it. If retrieving the per cpu variable calls
back into the branch tracer, you can see how things will break.

Instead of using a per cpu variable, use the trace_recursion field
of the current task struct. Simply set a bit when entering the
branch tracing and clear it when leaving. If the bit is set on
entry, just don't do the tracing.

There's also the case with lockdep, as the local_irq_save() called
before the recursion can also trigger code that can call back into
the function. Changing that to a raw_local_irq_save() will protect
that as well.

This prevents the recursion and the inevitable crash that follows.

Link: http://lkml.kernel.org/r/20150630141803.GA28071@wfg-t540p.sh.intel.com

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Tested-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2015-07-07 15:05:03 -04:00 committed by Greg Kroah-Hartman
parent 3f6ba7f88d
commit f1bb130708
2 changed files with 11 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
kernel/trace/trace.h
View File

@ -428,6 +428,7 @@ enum {
TRACE_CONTROL_BIT,
TRACE_BRANCH_BIT,
/*
* Abuse of the trace_recursion.
* As we need a way to maintain state if we are tracing the function

17
kernel/trace/trace_branch.c
View File

@ -37,9 +37,12 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
struct trace_branch *entry;
struct ring_buffer *buffer;
unsigned long flags;
int cpu, pc;
int pc;
const char *p;
if (current->trace_recursion & TRACE_BRANCH_BIT)
return;
/*
* I would love to save just the ftrace_likely_data pointer, but
* this code can also be used by modules. Ugly things can happen
@ -50,10 +53,10 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
if (unlikely(!tr))
return;
local_irq_save(flags);
cpu = raw_smp_processor_id();
data = per_cpu_ptr(tr->trace_buffer.data, cpu);
if (atomic_inc_return(&data->disabled) != 1)
raw_local_irq_save(flags);
current->trace_recursion |= TRACE_BRANCH_BIT;
data = this_cpu_ptr(tr->trace_buffer.data);
if (atomic_read(&data->disabled))
goto out;
pc = preempt_count();
@ -82,8 +85,8 @@ probe_likely_condition(struct ftrace_branch_data *f, int val, int expect)
__buffer_unlock_commit(buffer, event);
out:
atomic_dec(&data->disabled);
local_irq_restore(flags);
current->trace_recursion &= ~TRACE_BRANCH_BIT;
raw_local_irq_restore(flags);
}
static inline