Re: [PATCH v2 3/4] coresight: etm4x: Don't trace PID 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/20211214/202112140527.RSkgSFCc-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/dd716cd12b2f0e47fcc2b0e3e9172e4e70ad4877
        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 dd716cd12b2f0e47fcc2b0e3e9172e4e70ad4877
        # 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-core.c:661:6: error: implicit declaration of function 'task_is_in_init_pid_ns' [-Werror,-Wimplicit-function-declaration]
               task_is_in_init_pid_ns(current))
               ^
   1 error generated.


vim +/task_is_in_init_pid_ns +661 drivers/hwtracing/coresight/coresight-etm4x-core.c

   606	
   607	static int etm4_parse_event_config(struct coresight_device *csdev,
   608					   struct perf_event *event)
   609	{
   610		int ret = 0;
   611		struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
   612		struct etmv4_config *config = &drvdata->config;
   613		struct perf_event_attr *attr = &event->attr;
   614		unsigned long cfg_hash;
   615		int preset;
   616	
   617		/* Clear configuration from previous run */
   618		memset(config, 0, sizeof(struct etmv4_config));
   619	
   620		if (attr->exclude_kernel)
   621			config->mode = ETM_MODE_EXCL_KERN;
   622	
   623		if (attr->exclude_user)
   624			config->mode = ETM_MODE_EXCL_USER;
   625	
   626		/* Always start from the default config */
   627		etm4_set_default_config(config);
   628	
   629		/* Configure filters specified on the perf cmd line, if any. */
   630		ret = etm4_set_event_filters(drvdata, event);
   631		if (ret)
   632			goto out;
   633	
   634		/* Go from generic option to ETMv4 specifics */
   635		if (attr->config & BIT(ETM_OPT_CYCACC)) {
   636			config->cfg |= BIT(4);
   637			/* TRM: Must program this for cycacc to work */
   638			config->ccctlr = ETM_CYC_THRESHOLD_DEFAULT;
   639		}
   640		if (attr->config & BIT(ETM_OPT_TS)) {
   641			/*
   642			 * Configure timestamps to be emitted at regular intervals in
   643			 * order to correlate instructions executed on different CPUs
   644			 * (CPU-wide trace scenarios).
   645			 */
   646			ret = etm4_config_timestamp_event(drvdata);
   647	
   648			/*
   649			 * No need to go further if timestamp intervals can't
   650			 * be configured.
   651			 */
   652			if (ret)
   653				goto out;
   654	
   655			/* bit[11], Global timestamp tracing bit */
   656			config->cfg |= BIT(11);
   657		}
   658	
   659		/* Only trace contextID when runs in root PID namespace */
   660		if ((attr->config & BIT(ETM_OPT_CTXTID)) &&
 > 661		    task_is_in_init_pid_ns(current))
   662			/* bit[6], Context ID tracing bit */
   663			config->cfg |= BIT(ETM4_CFG_BIT_CTXTID);
   664	
   665		/*
   666		 * If set bit ETM_OPT_CTXTID2 in perf config, this asks to trace VMID
   667		 * for recording CONTEXTIDR_EL2.  Do not enable VMID tracing if the
   668		 * kernel is not running in EL2.
   669		 */
   670		if (attr->config & BIT(ETM_OPT_CTXTID2)) {
   671			if (!is_kernel_in_hyp_mode()) {
   672				ret = -EINVAL;
   673				goto out;
   674			}
   675	
   676			/* Only trace virtual contextID when runs in root PID namespace */
   677			if (task_is_in_init_pid_ns(current))
   678				config->cfg |= BIT(ETM4_CFG_BIT_VMID) |
   679					       BIT(ETM4_CFG_BIT_VMID_OPT);
   680		}
   681	
   682		/* return stack - enable if selected and supported */
   683		if ((attr->config & BIT(ETM_OPT_RETSTK)) && drvdata->retstack)
   684			/* bit[12], Return stack enable bit */
   685			config->cfg |= BIT(12);
   686	
   687		/*
   688		 * Set any selected configuration and preset.
   689		 *
   690		 * This extracts the values of PMU_FORMAT_ATTR(configid) and PMU_FORMAT_ATTR(preset)
   691		 * in the perf attributes defined in coresight-etm-perf.c.
   692		 * configid uses bits 63:32 of attr->config2, preset uses bits 3:0 of attr->config.
   693		 * A zero configid means no configuration active, preset = 0 means no preset selected.
   694		 */
   695		if (attr->config2 & GENMASK_ULL(63, 32)) {
   696			cfg_hash = (u32)(attr->config2 >> 32);
   697			preset = attr->config & 0xF;
   698			ret = cscfg_csdev_enable_active_config(csdev, cfg_hash, preset);
   699		}
   700	
   701	out:
   702		return ret;
   703	}
   704	

---
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