Re: [PATCH v2 2/4] coresight: etm4x: Don't use virtual contextID for non-root PID namespace

[kernel test robot <lkp@intel.com>]

Hi Leo,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.16-rc5]
[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/Leo-Yan/coresight-etm-Correct-PID-tracing-for-non-root-namespace/20211213-201632
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2585cf9dfaaddf00b069673f27bb3f8530e2039c
config: arm64-randconfig-r034-20211213 (https://download.01.org/0day-ci/archive/20211214/202112140333.58pdbVRp-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a2ddb6c8ac29412b1361810972e15221fa021c)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/0day-ci/linux/commit/3b7eceb25155c98432dea4821c4fc571b44d72e3
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Leo-Yan/coresight-etm-Correct-PID-tracing-for-non-root-namespace/20211213-201632
        git checkout 3b7eceb25155c98432dea4821c4fc571b44d72e3
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/hwtracing/coresight/

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-etm4x-sysfs.c:2118:7: error: implicit declaration of function 'task_is_in_init_pid_ns' [-Werror,-Wimplicit-function-declaration]
           if (!task_is_in_init_pid_ns(current))
                ^
   drivers/hwtracing/coresight/coresight-etm4x-sysfs.c:2139:7: error: implicit declaration of function 'task_is_in_init_pid_ns' [-Werror,-Wimplicit-function-declaration]
           if (!task_is_in_init_pid_ns(current))
                ^
   drivers/hwtracing/coresight/coresight-etm4x-sysfs.c:2169:7: error: implicit declaration of function 'task_is_in_init_pid_ns' [-Werror,-Wimplicit-function-declaration]
           if (!task_is_in_init_pid_ns(current))
                ^
   drivers/hwtracing/coresight/coresight-etm4x-sysfs.c:2193:7: error: implicit declaration of function 'task_is_in_init_pid_ns' [-Werror,-Wimplicit-function-declaration]
           if (!task_is_in_init_pid_ns(current))
                ^
   4 errors generated.


vim +/task_is_in_init_pid_ns +2118 drivers/hwtracing/coresight/coresight-etm4x-sysfs.c

  2105	
  2106	static ssize_t vmid_val_show(struct device *dev,
  2107				     struct device_attribute *attr,
  2108				     char *buf)
  2109	{
  2110		unsigned long val;
  2111		struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
  2112		struct etmv4_config *config = &drvdata->config;
  2113	
  2114		/*
  2115		 * Don't use virtual contextID tracing if coming from a PID namespace.
  2116		 * See comment in ctxid_pid_store().
  2117		 */
> 2118		if (!task_is_in_init_pid_ns(current))
  2119			return -EINVAL;
  2120	
  2121		spin_lock(&drvdata->spinlock);
  2122		val = (unsigned long)config->vmid_val[config->vmid_idx];
  2123		spin_unlock(&drvdata->spinlock);
  2124		return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
  2125	}
  2126	

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