[for-next][PATCH 3/7] tracing: Set kernel_stacks caller size properly

From: Steven Rostedt
Date: Sun Jan 26 2020 - 14:20:32 EST


From: Josef Bacik <jbacik@xxxxxx>

I noticed when trying to use the trace-cmd python interface that reading the raw
buffer wasn't working for kernel_stack events. This is because it uses a
stubbed version of __dynamic_array that doesn't do the __data_loc trick and
encode the length of the array into the field. Instead it just shows up as a
size of 0. So change this to __array and set the len to FTRACE_STACK_ENTRIES
since this is what we actually do in practice and matches how user_stack_trace
works.

Link: http://lkml.kernel.org/r/1411589652-1318-1-git-send-email-jbacik@xxxxxx

Signed-off-by: Josef Bacik <jbacik@xxxxxx>
[ Pulled from the archeological digging of my INBOX ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
---
kernel/trace/trace_entries.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index fc8e97328e54..78c146efb862 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -174,7 +174,7 @@ FTRACE_ENTRY(kernel_stack, stack_entry,

F_STRUCT(
__field( int, size )
- __dynamic_array(unsigned long, caller )
+ __array( unsigned long, caller, FTRACE_STACK_ENTRIES )
),

F_printk("\t=> %ps\n\t=> %ps\n\t=> %ps\n"
--
2.24.1