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SubjectRe: [PATCH v4 17/19] coresight: core: Add support for dedicated percpu sinks
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
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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