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SubjectRe: [PATCH v2 4/4] coresight: etm3x: Don't trace PID for non-root PID namespace
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On 12/14/21 12:46, Leo Yan wrote:
> Hi,
>
> On Tue, Dec 14, 2021 at 03:16:42AM +0800, kernel test robot wrote:
>> 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: arm-buildonly-randconfig-r003-20211213 (https://download.01.org/0day-ci/archive/20211214/202112140344.viPmOWp6-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 arm cross compiling tool for clang build
>> # apt-get install binutils-arm-linux-gnueabi
>> # https://github.com/0day-ci/linux/commit/81d5f47788c40d34c8159d64d4505eb485254e8f
>> 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 81d5f47788c40d34c8159d64d4505eb485254e8f
>> # 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=arm 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-etm3x-core.c:344:7: error: implicit declaration of function 'task_is_in_init_pid_ns' [-Werror,-Wimplicit-function-declaration]
>> if (!task_is_in_init_pid_ns(current))
>> ^
>> 1 error generated.
>>
>>
>> vim +/task_is_in_init_pid_ns +344 drivers/hwtracing/coresight/coresight-etm3x-core.c
>>
>> 301
>> 302 #define ETM3X_SUPPORTED_OPTIONS (ETMCR_CYC_ACC | \
>> 303 ETMCR_TIMESTAMP_EN | \
>> 304 ETMCR_RETURN_STACK)
>> 305
>> 306 static int etm_parse_event_config(struct etm_drvdata *drvdata,
>> 307 struct perf_event *event)
>> 308 {
>> 309 struct etm_config *config = &drvdata->config;
>> 310 struct perf_event_attr *attr = &event->attr;
>> 311
>> 312 if (!attr)
>> 313 return -EINVAL;
>> 314
>> 315 /* Clear configuration from previous run */
>> 316 memset(config, 0, sizeof(struct etm_config));
>> 317
>> 318 if (attr->exclude_kernel)
>> 319 config->mode = ETM_MODE_EXCL_KERN;
>> 320
>> 321 if (attr->exclude_user)
>> 322 config->mode = ETM_MODE_EXCL_USER;
>> 323
>> 324 /* Always start from the default config */
>> 325 etm_set_default(config);
>> 326
>> 327 /*
>> 328 * By default the tracers are configured to trace the whole address
>> 329 * range. Narrow the field only if requested by user space.
>> 330 */
>> 331 if (config->mode)
>> 332 etm_config_trace_mode(config);
>> 333
>> 334 /*
>> 335 * At this time only cycle accurate, return stack and timestamp
>> 336 * options are available.
>> 337 */
>> 338 if (attr->config & ~ETM3X_SUPPORTED_OPTIONS)
>> 339 return -EINVAL;
>> 340
>> 341 config->ctrl = attr->config;
>> 342
>> 343 /* Don't trace contextID when runs in non-root PID namespace */
>> > 344 if (!task_is_in_init_pid_ns(current))
> This patchset is based on another patchset [1], as described on the
> cover letter patch. This is why here reports for building failure.
>
> To avoid the false positive reporting, if any better practice I can
> follow up to resolve the dependency between two patchsets, please let
> me know and I will do in next time.

Hi Leo,

Sorry for the inconvenience, the bot doesn't support to parse the link
in cover letter yet,
we suggest to use '--base' as documented
inhttps://git-scm.com/docs/git-format-patch

Best Regards,
Rong CHen

>
> Thanks,
> Leo
>
> [1] https://lore.kernel.org/lkml/20211208083320.472503-1-leo.yan@linaro.org/
>
>> 345 config->ctrl &= ~ETMCR_CTXID_SIZE;
>> 346
>> 347 /*
>> 348 * Possible to have cores with PTM (supports ret stack) and ETM
>> 349 * (never has ret stack) on the same SoC. So if we have a request
>> 350 * for return stack that can't be honoured on this core then
>> 351 * clear the bit - trace will still continue normally
>> 352 */
>> 353 if ((config->ctrl & ETMCR_RETURN_STACK) &&
>> 354 !(drvdata->etmccer & ETMCCER_RETSTACK))
>> 355 config->ctrl &= ~ETMCR_RETURN_STACK;
>> 356
>> 357 return 0;
>> 358 }
>> 359
>>
>> ---
>> 0-DAY CI Kernel Test Service, Intel Corporation
>> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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