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selftests/ftrace: Update multiple kprobes test for powerpc 

KPROBES_ON_FTRACE is only available on powerpc64le. Update comment to
clarify this.

Also, we should use an offset of 8 to ensure that the probe does not
fall on ftrace location. The current offset of 4 will fall before the
function local entry point and won't fire, while an offset of 12 or 16
will fall on ftrace location. Offset 8 is currently guaranteed to not be
the ftrace location.

Link: http://lkml.kernel.org/r/3d32e8fa076070e83527476fdfa3a747bb9a1a3a.1499453040.git.naveen.n.rao@linux.vnet.ibm.com

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
zero-colors
Naveen N. Rao 2017-07-08 00:27:31 +05:30 committed by Steven Rostedt (VMware)
parent fca18a47cf
commit f7181e5aaa
1 changed files with 2 additions and 2 deletions
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4
tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc
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@ -2,10 +2,10 @@
# description: Register/unregister many kprobe events
# ftrace fentry skip size depends on the machine architecture.
# Currently HAVE_KPROBES_ON_FTRACE defined on x86 and powerpc
# Currently HAVE_KPROBES_ON_FTRACE defined on x86 and powerpc64le
case `uname -m` in
x86_64|i[3456]86) OFFS=5;;
ppc*) OFFS=4;;
ppc64le) OFFS=8;;
*) OFFS=0;;
esac