[PATCH] tracing: Add register read and write tracing support

[kernel test robot]

Hi Prasad,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/perf/core]
[also build test ERROR on trace/for-next arm64/for-next/core v5.9-rc7 next-20200925]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Prasad-Sodagudi/tracing-Add-register-read-and-write-tracing-support/20200928-083807
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git a3b1e8451d3fd54fe0df661c2c4f983932b3c0bc
config: h8300-allyesconfig (attached as .config)
compiler: h8300-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/9048e77f99a2b88a28c7d4b6e51fe5c9ba30960d
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Prasad-Sodagudi/tracing-Add-register-read-and-write-tracing-support/20200928-083807
        git checkout 9048e77f99a2b88a28c7d4b6e51fe5c9ba30960d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All errors (new ones prefixed by >>):

   h8300-linux-ld: kernel/trace/trace.o: in function `.L1150':
>> trace.c:(.text+0x7305): undefined reference to `ftrace_trace_userstack'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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