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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-20 23:21:28 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-20 23:21:28 +0300 |
| commit | ed15e8880fc3d8d52bc02a02521054bfcb26264a (patch) | |
| tree | 816a7f35028762976f5d4bc4df172e407c4bcbe2 /kernel/trace/trace_branch.c | |
| parent | b8d1f261fe7e4967593a5637d62991b6197a03f8 (diff) | |
| parent | 52721d9d3334c1cb1f76219a161084094ec634dc (diff) | |
| download | linux-ed15e8880fc3d8d52bc02a02521054bfcb26264a.tar.xz | |
Merge 4.2-rc3 into staging-next
We need the staging fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/trace/trace_branch.c')
| -rw-r--r-- | kernel/trace/trace_branch.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c index a87b43f49eb4..e2e12ad3186f 100644 --- a/kernel/trace/trace_branch.c +++ b/kernel/trace/trace_branch.c @@ -36,9 +36,12 @@ 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 @@ -49,10 +52,10 @@ 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(); @@ -81,8 +84,8 @@ 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 |