diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/fgraph.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c index ddedcb50917f..5c68d6109119 100644 --- a/kernel/trace/fgraph.c +++ b/kernel/trace/fgraph.c @@ -650,8 +650,13 @@ int function_graph_enter(unsigned long ret, unsigned long func, struct ftrace_graph_ent trace; unsigned long bitmap = 0; int offset; + int bit; int i; + bit = ftrace_test_recursion_trylock(func, ret); + if (bit < 0) + return -EBUSY; + trace.func = func; trace.depth = ++current->curr_ret_depth; @@ -697,12 +702,13 @@ int function_graph_enter(unsigned long ret, unsigned long func, * flag, set that bit always. */ set_bitmap(current, offset, bitmap | BIT(0)); - + ftrace_test_recursion_unlock(bit); return 0; out_ret: current->curr_ret_stack -= FGRAPH_FRAME_OFFSET + 1; out: current->curr_ret_depth--; + ftrace_test_recursion_unlock(bit); return -EBUSY; } |