Re: [PATCH v2 07/12] sched: Replace rq->curr access w/ rq_curr(rq)

kernel test robot
2023-03-21T11:12:49Z

Hi John,

I love your patch! Yet something to improve:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on tip/locking/core tip/master tip/auto-latest linus/master v6.3-rc3 next-20230321]
[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#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/John-Stultz/locking-ww_mutex-Remove-wakeups-from-under-mutex-wait_lock/20230321-074149
patch link: https://lore.kernel.org/r/20230320233720.3488453-8-jstultz%40google.com
patch subject: [PATCH v2 07/12] sched: Replace rq->curr access w/ rq_curr(rq)
config: x86_64-rhel-8.3 (https://download.01.org/0day-ci/archive/20230321/202303211827.IXnKJ5rO-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
# https://github.com/intel-lab-lkp/linux/commit/77507c3a77e09cdc627a73364246f252d918de41
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review John-Stultz/locking-ww_mutex-Remove-wakeups-from-under-mutex-wait_lock/20230321-074149
git checkout 77507c3a77e09cdc627a73364246f252d918de41
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 O=build_dir ARCH=x86_64 olddefconfig
make 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@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303211827.IXnKJ5rO-lkp@intel.com/

All errors (new ones prefixed by >>):

In file included from include/linux/rculist.h:11,
from include/linux/sched/signal.h:5,
from include/linux/sched/cputime.h:5,
from kernel/sched/build_policy.c:17:
kernel/sched/cputime.c: In function 'kcpustat_field':
>> kernel/sched/cputime.c:997:42: error: 'struct rq' has no member named 'curr'
997 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/rcupdate.h:453:17: note: in definition of macro '__rcu_dereference_check'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:997:24: note: in expansion of macro 'rcu_dereference'
997 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
>> kernel/sched/cputime.c:997:42: error: 'struct rq' has no member named 'curr'
997 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/rcupdate.h:453:38: note: in definition of macro '__rcu_dereference_check'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:997:24: note: in expansion of macro 'rcu_dereference'
997 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
In file included from <command-line>:
>> kernel/sched/cputime.c:997:42: error: 'struct rq' has no member named 'curr'
997 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/compiler_types.h:352:23: note: in definition of macro '__compiletime_assert'
352 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:372:9: note: in expansion of macro '_compiletime_assert'
372 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:453:50: note: in expansion of macro 'READ_ONCE'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^~~~~~~~~
include/linux/rcupdate.h:601:9: note: in expansion of macro '__rcu_dereference_check'
601 | __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:997:24: note: in expansion of macro 'rcu_dereference'
997 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
>> kernel/sched/cputime.c:997:42: error: 'struct rq' has no member named 'curr'
997 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/compiler_types.h:352:23: note: in definition of macro '__compiletime_assert'
352 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:372:9: note: in expansion of macro '_compiletime_assert'
372 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:453:50: note: in expansion of macro 'READ_ONCE'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^~~~~~~~~
include/linux/rcupdate.h:601:9: note: in expansion of macro '__rcu_dereference_check'
601 | __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:997:24: note: in expansion of macro 'rcu_dereference'
997 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
>> kernel/sched/cputime.c:997:42: error: 'struct rq' has no member named 'curr'
997 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/compiler_types.h:352:23: note: in definition of macro '__compiletime_assert'
352 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:372:9: note: in expansion of macro '_compiletime_assert'
372 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:453:50: note: in expansion of macro 'READ_ONCE'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^~~~~~~~~
include/linux/rcupdate.h:601:9: note: in expansion of macro '__rcu_dereference_check'
601 | __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:997:24: note: in expansion of macro 'rcu_dereference'
997 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
>> kernel/sched/cputime.c:997:42: error: 'struct rq' has no member named 'curr'
997 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/compiler_types.h:352:23: note: in definition of macro '__compiletime_assert'
352 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:372:9: note: in expansion of macro '_compiletime_assert'
372 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:453:50: note: in expansion of macro 'READ_ONCE'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^~~~~~~~~
include/linux/rcupdate.h:601:9: note: in expansion of macro '__rcu_dereference_check'
601 | __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:997:24: note: in expansion of macro 'rcu_dereference'
997 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
>> kernel/sched/cputime.c:997:42: error: 'struct rq' has no member named 'curr'
997 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/compiler_types.h:352:23: note: in definition of macro '__compiletime_assert'
352 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:372:9: note: in expansion of macro '_compiletime_assert'
372 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:453:50: note: in expansion of macro 'READ_ONCE'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^~~~~~~~~
include/linux/rcupdate.h:601:9: note: in expansion of macro '__rcu_dereference_check'
601 | __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:997:24: note: in expansion of macro 'rcu_dereference'
997 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
>> kernel/sched/cputime.c:997:42: error: 'struct rq' has no member named 'curr'
997 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/compiler_types.h:328:27: note: in definition of macro '__unqual_scalar_typeof'
328 | _Generic((x), \
| ^
include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE'
50 | __READ_ONCE(x); \
| ^~~~~~~~~~~
include/linux/rcupdate.h:453:50: note: in expansion of macro 'READ_ONCE'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^~~~~~~~~
include/linux/rcupdate.h:601:9: note: in expansion of macro '__rcu_dereference_check'
601 | __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:997:24: note: in expansion of macro 'rcu_dereference'
997 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
In file included from ./arch/x86/include/generated/asm/rwonce.h:1,
from include/linux/compiler.h:247,
from include/linux/build_bug.h:5,
from include/linux/container_of.h:5,
from include/linux/list.h:5,
from include/linux/smp.h:12,
from include/linux/sched/clock.h:5,
from kernel/sched/build_policy.c:16:
>> kernel/sched/cputime.c:997:42: error: 'struct rq' has no member named 'curr'
997 | curr = rcu_dereference(rq->curr);
| ^~
include/asm-generic/rwonce.h:44:73: note: in definition of macro '__READ_ONCE'
44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
| ^
include/linux/rcupdate.h:453:50: note: in expansion of macro 'READ_ONCE'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^~~~~~~~~
include/linux/rcupdate.h:601:9: note: in expansion of macro '__rcu_dereference_check'
601 | __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:997:24: note: in expansion of macro 'rcu_dereference'
997 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
In file included from include/linux/rculist.h:11,
from include/linux/sched/signal.h:5,
from include/linux/sched/cputime.h:5,
from kernel/sched/build_policy.c:17:
>> kernel/sched/cputime.c:997:42: error: 'struct rq' has no member named 'curr'
997 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/rcupdate.h:456:19: note: in definition of macro '__rcu_dereference_check'
456 | ((typeof(*p) __force __kernel *)(local)); \
| ^
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:997:24: note: in expansion of macro 'rcu_dereference'
997 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
kernel/sched/cputime.c: In function 'kcpustat_cpu_fetch':
kernel/sched/cputime.c:1084:42: error: 'struct rq' has no member named 'curr'
1084 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/rcupdate.h:453:17: note: in definition of macro '__rcu_dereference_check'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:1084:24: note: in expansion of macro 'rcu_dereference'
1084 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
kernel/sched/cputime.c:1084:42: error: 'struct rq' has no member named 'curr'
1084 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/rcupdate.h:453:38: note: in definition of macro '__rcu_dereference_check'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:1084:24: note: in expansion of macro 'rcu_dereference'
1084 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
In file included from <command-line>:
kernel/sched/cputime.c:1084:42: error: 'struct rq' has no member named 'curr'
1084 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/compiler_types.h:352:23: note: in definition of macro '__compiletime_assert'
352 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:372:9: note: in expansion of macro '_compiletime_assert'
372 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:453:50: note: in expansion of macro 'READ_ONCE'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^~~~~~~~~
include/linux/rcupdate.h:601:9: note: in expansion of macro '__rcu_dereference_check'
601 | __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:1084:24: note: in expansion of macro 'rcu_dereference'
1084 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
kernel/sched/cputime.c:1084:42: error: 'struct rq' has no member named 'curr'
1084 | curr = rcu_dereference(rq->curr);
| ^~
include/linux/compiler_types.h:352:23: note: in definition of macro '__compiletime_assert'
352 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:372:9: note: in expansion of macro '_compiletime_assert'
372 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:453:50: note: in expansion of macro 'READ_ONCE'
453 | typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
| ^~~~~~~~~
include/linux/rcupdate.h:601:9: note: in expansion of macro '__rcu_dereference_check'
601 | __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/rcupdate.h:673:28: note: in expansion of macro 'rcu_dereference_check'
673 | #define rcu_dereference(p) rcu_dereference_check(p, 0)
| ^~~~~~~~~~~~~~~~~~~~~
kernel/sched/cputime.c:1084:24: note: in expansion of macro 'rcu_dereference'
1084 | curr = rcu_dereference(rq->curr);
| ^~~~~~~~~~~~~~~
kernel/sched/cputime.c:1084:42: error: 'struct rq' has no member named 'curr'
1084 | curr = rcu_dereference(rq->curr);
| ^~

vim +997 kernel/sched/cputime.c

64eea63c19a2c3 Frederic Weisbecker 2019-10-25 979
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 980 u64 kcpustat_field(struct kernel_cpustat *kcpustat,
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 981 enum cpu_usage_stat usage, int cpu)
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 982 {
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 983 u64 *cpustat = kcpustat->cpustat;
e0d648f9d883ec Borislav Petkov 2020-03-27 984 u64 val = cpustat[usage];
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 985 struct rq *rq;
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 986 int err;
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 987
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 988 if (!vtime_accounting_enabled_cpu(cpu))
e0d648f9d883ec Borislav Petkov 2020-03-27 989 return val;
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 990
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 991 rq = cpu_rq(cpu);
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 992
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 993 for (;;) {
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 994 struct task_struct *curr;
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 995
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 996 rcu_read_lock();
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 @997 curr = rcu_dereference(rq->curr);
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 998 if (WARN_ON_ONCE(!curr)) {
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 999 rcu_read_unlock();
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 1000 return cpustat[usage];
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 1001 }
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 1002
5a1c95580f1d89 Frederic Weisbecker 2019-11-21 1003 err = kcpustat_field_vtime(cpustat, curr, usage, cpu, &val);
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 1004 rcu_read_unlock();
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 1005
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 1006 if (!err)
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 1007 return val;
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 1008
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 1009 cpu_relax();
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 1010 }
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 1011 }
64eea63c19a2c3 Frederic Weisbecker 2019-10-25 1012 EXPORT_SYMBOL_GPL(kcpustat_field);
74722bb223d0f2 Frederic Weisbecker 2019-11-21 1013

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