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Message-ID: <202212281248.UvOL9pV6-lkp@intel.com>
Date: Wed, 28 Dec 2022 12:55:59 +0800
From: kernel test robot <lkp@...el.com>
To: SeongJae Park <sj@...nel.org>, akpm@...ux-foundation.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
alexander.h.duyck@...ux.intel.com, paulmck@...nel.org,
linux-mm@...ck.org, rcu@...r.kernel.org,
linux-kernel@...r.kernel.org, SeongJae Park <sj@...nel.org>
Subject: Re: [PATCH v2] mm/page_reporting: replace rcu_access_pointer() with
rcu_dereference_protected()
Hi SeongJae,
I love your patch! Yet something to improve:
[auto build test ERROR on akpm-mm/mm-everything]
url: https://github.com/intel-lab-lkp/linux/commits/SeongJae-Park/mm-page_reporting-replace-rcu_access_pointer-with-rcu_dereference_protected/20221228-093057
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/20221228012902.1510901-1-sj%40kernel.org
patch subject: [PATCH v2] mm/page_reporting: replace rcu_access_pointer() with rcu_dereference_protected()
config: x86_64-randconfig-a002-20221226
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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
# https://github.com/intel-lab-lkp/linux/commit/f7744809d7f12dccff86c60831ddf3c316ada60e
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review SeongJae-Park/mm-page_reporting-replace-rcu_access_pointer-with-rcu_dereference_protected/20221228-093057
git checkout f7744809d7f12dccff86c60831ddf3c316ada60e
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
>> mm/page_reporting.c:360:5: error: member reference base type 'typeof (page_reporting_order)' (aka 'unsigned int') is not a structure or union
lockdep_is_held(&page_reporting_order))) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/lockdep.h:286:52: note: expanded from macro 'lockdep_is_held'
#define lockdep_is_held(lock) lock_is_held(&(lock)->dep_map)
^ ~~~~~~~
include/linux/rcupdate.h:664:54: note: expanded from macro 'rcu_dereference_protected'
__rcu_dereference_protected((p), __UNIQUE_ID(rcu), (c), __rcu)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
include/linux/rcupdate.h:460:21: note: expanded from macro '__rcu_dereference_protected'
RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_protected() usage"); \
~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:381:8: note: expanded from macro 'RCU_LOCKDEP_WARN'
if ((c) && debug_lockdep_rcu_enabled() && !__warned) { \
^
1 error generated.
vim +360 mm/page_reporting.c
351
352 int page_reporting_register(struct page_reporting_dev_info *prdev)
353 {
354 int err = 0;
355
356 mutex_lock(&page_reporting_mutex);
357
358 /* nothing to do if already in use */
359 if (rcu_dereference_protected(pr_dev_info,
> 360 lockdep_is_held(&page_reporting_order))) {
361 err = -EBUSY;
362 goto err_out;
363 }
364
365 /*
366 * If the page_reporting_order value is not set, we check if
367 * an order is provided from the driver that is performing the
368 * registration. If that is not provided either, we default to
369 * pageblock_order.
370 */
371
372 if (page_reporting_order == -1) {
373 if (prdev->order > 0 && prdev->order <= MAX_ORDER)
374 page_reporting_order = prdev->order;
375 else
376 page_reporting_order = pageblock_order;
377 }
378
379 /* initialize state and work structures */
380 atomic_set(&prdev->state, PAGE_REPORTING_IDLE);
381 INIT_DELAYED_WORK(&prdev->work, &page_reporting_process);
382
383 /* Begin initial flush of zones */
384 __page_reporting_request(prdev);
385
386 /* Assign device to allow notifications */
387 rcu_assign_pointer(pr_dev_info, prdev);
388
389 /* enable page reporting notification */
390 if (!static_key_enabled(&page_reporting_enabled)) {
391 static_branch_enable(&page_reporting_enabled);
392 pr_info("Free page reporting enabled\n");
393 }
394 err_out:
395 mutex_unlock(&page_reporting_mutex);
396
397 return err;
398 }
399 EXPORT_SYMBOL_GPL(page_reporting_register);
400
--
0-DAY CI Kernel Test Service
https://01.org/lkp
View attachment "config" of type "text/plain" (127158 bytes)
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