Re: [PATCH ftrace/core v6 5/5] kselftest, ftrace: Add ftrace IPMODIFY flag test

From: Steven Rostedt
Date: Fri Nov 21 2014 - 16:03:48 EST

On Fri, 21 Nov 2014 05:25:37 -0500
Masami Hiramatsu <> wrote:

> Add ftrace IPMODIFY flag test to selftest/ftrace. The
> test checks simple ftrace handler insertion and
> combinations of ftrace, kprobe, and jprobe.
> This test requires kernel build tree to build a test
> kernel module and root privilege to run.
> Signed-off-by: Masami Hiramatsu <>
> ---

Can you make it so that make O=/path/to/build works?

I tried running this on my test box, which has /home/rostedt mounted
read only from my build box, and I get this:

[root@bxtest ftrace]# make O=/tmp
for TARGET in ipmodify; do \
make -C $TARGET; \
make[1]: Entering directory `/work/git/linux-trace.git/tools/testing/selftests/ftrace/ipmodify'
make -C /lib/modules/3.18.0-rc1-test+/build M=/work/git/linux-trace.git/tools/testing/selftests/ftrace/ipmodify ipmodify.ko
make[2]: Entering directory `/home/rostedt/work/git/nobackup/bxtest/trace'
CC [M] /work/git/linux-trace.git/tools/testing/selftests/ftrace/ipmodify/ipmodify.o
/bin/sh: ./scripts/recordmcount: Permission denied
make[5]: *** [/work/git/linux-trace.git/tools/testing/selftests/ftrace/ipmodify/ipmodify.o] Error 1
make[4]: *** [ipmodify.ko] Error 2
make[3]: *** [sub-make] Error 2
make[2]: *** [__sub-make] Error 2
make[2]: Leaving directory `/home/rostedt/work/git/nobackup/bxtest/trace'
make[1]: *** [ipmodify.ko] Error 2
make[1]: Leaving directory `/work/git/linux-trace.git/tools/testing/selftests/ftrace/ipmodify'
make: *** [all] Error 2

-- Steve
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