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selftest/ftrace: Move kprobe selftest function to separate compile unit 

Move selftest function to its own compile unit so it can be compiled
with the ftrace cflags (CC_FLAGS_FTRACE) allowing it to be probed
during the ftrace startup tests.

Link: http://lkml.kernel.org/r/153294604271.32740.16490677128630177030.stgit@devbox

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Francis Deslauriers 2018-07-30 19:20:42 +09:00 committed by Steven Rostedt (VMware)
parent 45408c4f92
commit d899926f55
4 changed files with 23 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
kernel/trace/Makefile
View File

@ -13,6 +13,11 @@ obj-y += trace_selftest_dynamic.o
endif
endif
ifdef CONFIG_FTRACE_STARTUP_TEST
CFLAGS_trace_kprobe_selftest.o = $(CC_FLAGS_FTRACE)
obj-$(CONFIG_KPROBE_EVENTS) += trace_kprobe_selftest.o
endif
# If unlikely tracing is enabled, do not trace these files
ifdef CONFIG_TRACING_BRANCHES
KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING

12
kernel/trace/trace_kprobe.c
View File

@ -23,6 +23,7 @@
#include <linux/rculist.h>
#include <linux/error-injection.h>
#include "trace_kprobe_selftest.h"
#include "trace_probe.h"
#define KPROBE_EVENT_SYSTEM "kprobes"
@ -1587,17 +1588,6 @@ fs_initcall(init_kprobe_trace);
#ifdef CONFIG_FTRACE_STARTUP_TEST
/*
* The "__used" keeps gcc from removing the function symbol
* from the kallsyms table. 'noinline' makes sure that there
* isn't an inlined version used by the test method below
*/
static __used __init noinline int
kprobe_trace_selftest_target(int a1, int a2, int a3, int a4, int a5, int a6)
{
return a1 + a2 + a3 + a4 + a5 + a6;
}
static __init struct trace_event_file *
find_trace_probe_file(struct trace_kprobe *tk, struct trace_array *tr)
{

10
kernel/trace/trace_kprobe_selftest.c Normal file
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@ -0,0 +1,10 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Function used during the kprobe self test. This function is in a separate
* compile unit so it can be compile with CC_FLAGS_FTRACE to ensure that it
* can be probed by the selftests.
*/
int kprobe_trace_selftest_target(int a1, int a2, int a3, int a4, int a5, int a6)
{
return a1 + a2 + a3 + a4 + a5 + a6;
}

7
kernel/trace/trace_kprobe_selftest.h Normal file
View File

@ -0,0 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Function used during the kprobe self test. This function is in a separate
* compile unit so it can be compile with CC_FLAGS_FTRACE to ensure that it
* can be probed by the selftests.
*/
int kprobe_trace_selftest_target(int a1, int a2, int a3, int a4, int a5, int a6);