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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-16 09:08:51 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-16 09:08:51 +0100 |
| commit | 94e14da890b1b68526b5f87ff1c97f374fd2471e (patch) | |
| tree | ad17c794208b02cd2ae24d67ab7e9c14c2fd43c5 /kernel/trace/fgraph.c | |
| parent | 5367601b52696004f363e4f6c0b228b5bbf7d8b7 (diff) | |
| parent | d1eef1c619749b2a57e514a3fa67d9a516ffa919 (diff) | |
Merge 5.5-rc2 into driver-core-next
We need the driver core fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/trace/fgraph.c')
| -rw-r--r-- | kernel/trace/fgraph.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c index 67e0c462b059..a2659735db73 100644 --- a/kernel/trace/fgraph.c +++ b/kernel/trace/fgraph.c @@ -101,6 +101,15 @@ int function_graph_enter(unsigned long ret, unsigned long func, { struct ftrace_graph_ent trace; + /* + * Skip graph tracing if the return location is served by direct trampoline, + * since call sequence and return addresses is unpredicatable anymore. + * Ex: BPF trampoline may call original function and may skip frame + * depending on type of BPF programs attached. + */ + if (ftrace_direct_func_count && + ftrace_find_rec_direct(ret - MCOUNT_INSN_SIZE)) + return -EBUSY; trace.func = func; trace.depth = ++current->curr_ret_depth; |