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Date: Thu, 17 Sep 2020 22:13:50 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Josef Bacik <jbacik@...com>, Steven Rostedt <rostedt@...dmis.org>, Sasha Levin <sashal@...nel.org> Subject: [PATCH AUTOSEL 4.9 25/90] tracing: Set kernel_stack's caller size properly From: Josef Bacik <jbacik@...com> [ Upstream commit cbc3b92ce037f5e7536f6db157d185cd8b8f615c ] 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@fb.com Signed-off-by: Josef Bacik <jbacik@...com> [ Pulled from the archeological digging of my INBOX ] Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- 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 d1cc37e78f997..1430f6bbb1a07 100644 --- a/kernel/trace/trace_entries.h +++ b/kernel/trace/trace_entries.h @@ -178,7 +178,7 @@ 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=> (" IP_FMT ")\n\t=> (" IP_FMT ")\n\t=> (" IP_FMT ")\n" -- 2.25.1
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