Hi Suzuki,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on next-20210226]
[cannot apply to kvmarm/next arm64/for-next/core tip/perf/core v5.11]
[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/Suzuki-K-Poulose/arm64-coresight-Add-support-for-ETE-and-TRBE/20210226-035447
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 6fbd6cf85a3be127454a1ad58525a3adcf8612ab
config: arm-randconfig-r024-20210225 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a921aaf789912d981cbb2036bdc91ad7289e1523)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/0day-ci/linux/commit/c37564326cdf11e0839eae06c1bfead47d3e5775
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Suzuki-K-Poulose/arm64-coresight-Add-support-for-ETE-and-TRBE/20210226-035447
        git checkout c37564326cdf11e0839eae06c1bfead47d3e5775
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

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

All errors (new ones prefixed by >>):

>> drivers/hwtracing/coresight/coresight-core.c:800:6: error: implicit declaration of function 'coresight_is_percpu_source' [-Werror,-Wimplicit-function-declaration]
           if (coresight_is_percpu_source(csdev) && coresight_is_percpu_sink(sink) &&
               ^
>> drivers/hwtracing/coresight/coresight-core.c:800:43: error: implicit declaration of function 'coresight_is_percpu_sink' [-Werror,-Wimplicit-function-declaration]
           if (coresight_is_percpu_source(csdev) && coresight_is_percpu_sink(sink) &&
                                                    ^
   drivers/hwtracing/coresight/coresight-core.c:1024:7: error: implicit declaration of function 'coresight_is_percpu_source' [-Werror,-Wimplicit-function-declaration]
                   if (coresight_is_percpu_source(csdev))
                       ^
   3 errors generated.


vim +/coresight_is_percpu_source +800 drivers/hwtracing/coresight/coresight-core.c

   775	
   776	/**
   777	 * _coresight_build_path - recursively build a path from a @csdev to a sink.
   778	 * @csdev:	The device to start from.
   779	 * @sink:	The final sink we want in this path.
   780	 * @path:	The list to add devices to.
   781	 *
   782	 * The tree of Coresight device is traversed until an activated sink is
   783	 * found.  From there the sink is added to the list along with all the
   784	 * devices that led to that point - the end result is a list from source
   785	 * to sink. In that list the source is the first device and the sink the
   786	 * last one.
   787	 */
   788	static int _coresight_build_path(struct coresight_device *csdev,
   789					 struct coresight_device *sink,
   790					 struct list_head *path)
   791	{
   792		int i, ret;
   793		bool found = false;
   794		struct coresight_node *node;
   795	
   796		/* An activated sink has been found.  Enqueue the element */
   797		if (csdev == sink)
   798			goto out;
   799	
 > 800		if (coresight_is_percpu_source(csdev) && coresight_is_percpu_sink(sink) &&
   801		    sink == per_cpu(csdev_sink, source_ops(csdev)->cpu_id(csdev))) {
   802			if (_coresight_build_path(sink, sink, path) == 0) {
   803				found = true;
   804				goto out;
   805			}
   806		}
   807	
   808		/* Not a sink - recursively explore each port found on this element */
   809		for (i = 0; i < csdev->pdata->nr_outport; i++) {
   810			struct coresight_device *child_dev;
   811	
   812			child_dev = csdev->pdata->conns[i].child_dev;
   813			if (child_dev &&
   814			    _coresight_build_path(child_dev, sink, path) == 0) {
   815				found = true;
   816				break;
   817			}
   818		}
   819	
   820		if (!found)
   821			return -ENODEV;
   822	
   823	out:
   824		/*
   825		 * A path from this element to a sink has been found.  The elements
   826		 * leading to the sink are already enqueued, all that is left to do
   827		 * is tell the PM runtime core we need this element and add a node
   828		 * for it.
   829		 */
   830		ret = coresight_grab_device(csdev);
   831		if (ret)
   832			return ret;
   833	
   834		node = kzalloc(sizeof(struct coresight_node), GFP_KERNEL);
   835		if (!node)
   836			return -ENOMEM;
   837	
   838		node->csdev = csdev;
   839		list_add(&node->link, path);
   840	
   841		return 0;
   842	}
   843	

---
0-DAY CI Kernel Test Service, Intel Corporation
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