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Date: Tue, 10 May 2022 20:00:51 +0800
From: kernel test robot <lkp@...el.com>
To: Chen Yu <yu.c.chen@...el.com>
Cc: kbuild-all@...ts.01.org, Chen Yu <yu.c.chen@...el.com>,
linux-kernel@...r.kernel.org
Subject: [yu-chen-surf:sis 1/1] kernel/sched/fair.c:9317:19: sparse: sparse:
incompatible types in comparison expression (different type sizes):
tree: https://github.com/yu-chen-surf/linux.git sis
head: e59a4ccc3962b54c5488c142b073dcf9b85b5843
commit: e59a4ccc3962b54c5488c142b073dcf9b85b5843 [1/1] sched/fair: Introduce SIS_UTIL to search idle CPU based on sum of util_avg
config: arc-randconfig-s031-20220509 (https://download.01.org/0day-ci/archive/20220510/202205101914.mxQiTOkX-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 11.3.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-dirty
# https://github.com/yu-chen-surf/linux/commit/e59a4ccc3962b54c5488c142b073dcf9b85b5843
git remote add yu-chen-surf https://github.com/yu-chen-surf/linux.git
git fetch --no-tags yu-chen-surf sis
git checkout e59a4ccc3962b54c5488c142b073dcf9b85b5843
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arc SHELL=/bin/bash kernel/sched/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
sparse warnings: (new ones prefixed by >>)
kernel/sched/fair.c:918:34: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct sched_entity *se @@ got struct sched_entity [noderef] __rcu * @@
kernel/sched/fair.c:918:34: sparse: expected struct sched_entity *se
kernel/sched/fair.c:918:34: sparse: got struct sched_entity [noderef] __rcu *
kernel/sched/fair.c:11027:9: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/fair.c:11027:9: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/fair.c:11027:9: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/fair.c:5053:22: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/fair.c:5053:22: sparse: struct task_struct [noderef] __rcu *
kernel/sched/fair.c:5053:22: sparse: struct task_struct *
kernel/sched/fair.c:5834:1: sparse: sparse: symbol '__pcpu_scope_load_balance_mask' was not declared. Should it be static?
kernel/sched/fair.c:5835:1: sparse: sparse: symbol '__pcpu_scope_select_idle_mask' was not declared. Should it be static?
kernel/sched/fair.c:6817:20: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/fair.c:6817:20: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/fair.c:6817:20: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/fair.c:6951:9: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] tmp @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/fair.c:6951:9: sparse: expected struct sched_domain *[assigned] tmp
kernel/sched/fair.c:6951:9: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/fair.c:7149:38: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct task_struct *curr @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/fair.c:7149:38: sparse: expected struct task_struct *curr
kernel/sched/fair.c:7149:38: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/fair.c:7447:38: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct task_struct *curr @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/fair.c:7447:38: sparse: expected struct task_struct *curr
kernel/sched/fair.c:7447:38: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/fair.c:8432:40: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct sched_domain *child @@ got struct sched_domain [noderef] __rcu *child @@
kernel/sched/fair.c:8432:40: sparse: expected struct sched_domain *child
kernel/sched/fair.c:8432:40: sparse: got struct sched_domain [noderef] __rcu *child
kernel/sched/fair.c:8976:22: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/fair.c:8976:22: sparse: struct task_struct [noderef] __rcu *
kernel/sched/fair.c:8976:22: sparse: struct task_struct *
kernel/sched/fair.c:10302:9: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/fair.c:10302:9: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/fair.c:10302:9: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/fair.c:9962:44: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct sched_domain *sd_parent @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/fair.c:9962:44: sparse: expected struct sched_domain *sd_parent
kernel/sched/fair.c:9962:44: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/fair.c:10398:9: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/fair.c:10398:9: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/fair.c:10398:9: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/fair.c:4693:31: sparse: sparse: marked inline, but without a definition
kernel/sched/fair.c: note: in included file:
kernel/sched/sched.h:2169:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2169:9: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2169:9: sparse: struct task_struct *
>> kernel/sched/fair.c:9317:19: sparse: sparse: incompatible types in comparison expression (different type sizes):
>> kernel/sched/fair.c:9317:19: sparse: int *
>> kernel/sched/fair.c:9317:19: sparse: long *
kernel/sched/sched.h:2011:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2011:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2011:25: sparse: struct task_struct *
kernel/sched/sched.h:2011:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2011:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2011:25: sparse: struct task_struct *
vim +9317 kernel/sched/fair.c
9267
9268 static inline void update_idle_cpu_scan(struct lb_env *env,
9269 unsigned long sum_util)
9270 {
9271 struct sched_domain_shared *sd_share;
9272 int nr_scan, nr_llc, x, y;
9273
9274 if (!sched_feat(SIS_UTIL))
9275 return;
9276 /*
9277 * Update the number of CPUs to scan in LLC domain, which could
9278 * be used as a hint in select_idle_cpu(). The update of this hint
9279 * occurs during periodic load balancing, rather than frequent
9280 * newidle balance.
9281 */
9282 nr_llc = per_cpu(sd_llc_size, env->dst_cpu);
9283 if (env->idle == CPU_NEWLY_IDLE ||
9284 env->sd->span_weight != nr_llc)
9285 return;
9286
9287 sd_share = rcu_dereference(per_cpu(sd_llc_shared, env->dst_cpu));
9288 if (!sd_share)
9289 return;
9290
9291 /*
9292 * The number of CPUs to search drops as sum_util increases, when
9293 * sum_util hits 85% or above, the scan stops.
9294 * The reason to choose 85% as the threshold is because this is the
9295 * imbalance_pct(117) when a LLC sched group is overloaded.
9296 *
9297 * let y = 1 - (x/0.85)^2 [1]
9298 *
9299 * y is the ratio of CPUs to be scanned in the LLC
9300 * domain, x is the ratio of sum_util compared to the
9301 * CPU capacity:
9302 *
9303 * x = sum_util / (nr_llc * SCHED_CAPACITY_SCALE) [2]
9304 *
9305 * Scale x by SCHED_CAPACITY_SCALE and [2] becomes:
9306 *
9307 * x = sum_util / nr_llc [3]
9308 *
9309 * and [1] becomes:
9310 *
9311 * y = (SCHED_CAPACITY_SCALE - (x*x)/740) / SCHED_CAPACITY_SCALE [4]
9312 *
9313 * then the number of CPUs to scan is nr_scan = nr_llc * y
9314 */
9315 x = sum_util / nr_llc;
9316 y = SCHED_CAPACITY_SCALE - (x * x) / 740;
> 9317 nr_scan = max(0, nr_llc * y / SCHED_CAPACITY_SCALE);
9318 WRITE_ONCE(sd_share->nr_idle_scan, nr_scan);
9319 }
9320
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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