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Message-ID: <202512120524.r3WemLC8-lkp@intel.com>
Date: Fri, 12 Dec 2025 05:45:02 +0800
From: kernel test robot <lkp@...el.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: kernel/sched/rt.c:1971:40: sparse: sparse: incorrect type in
argument 1 (different address spaces)
Hi Ingo,
First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: d358e5254674b70f34c847715ca509e46eb81e6f
commit: 15125a229abc2404a264ce493e64a9ffa7850f6e sched/smp: Use the SMP version of the RT scheduling class
date: 6 months ago
config: sh-randconfig-r131-20251211 (https://download.01.org/0day-ci/archive/20251212/202512120524.r3WemLC8-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251212/202512120524.r3WemLC8-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512120524.r3WemLC8-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
kernel/sched/build_policy.c: note: in included file:
kernel/sched/rt.c:838:70: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/rt.c:838:70: sparse: struct task_struct [noderef] __rcu *
kernel/sched/rt.c:838:70: sparse: struct task_struct *
kernel/sched/rt.c:2289:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/rt.c:2289:25: sparse: struct task_struct *
kernel/sched/rt.c:2289:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/rt.c:529:55: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct task_struct *donor @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/rt.c:529:55: sparse: expected struct task_struct *donor
kernel/sched/rt.c:529:55: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/rt.c:976:39: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct task_struct *donor @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/rt.c:976:39: sparse: expected struct task_struct *donor
kernel/sched/rt.c:976:39: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/rt.c:1490:31: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/rt.c:1490:31: sparse: expected struct task_struct *p
kernel/sched/rt.c:1490:31: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/rt.c:1804:9: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/rt.c:1804:9: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/rt.c:1804:9: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/rt.c:1509:14: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct *curr @@ got struct task_struct [noderef] __rcu * @@
kernel/sched/rt.c:1509:14: sparse: expected struct task_struct *curr
kernel/sched/rt.c:1509:14: sparse: got struct task_struct [noderef] __rcu *
kernel/sched/rt.c:1510:15: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct *donor @@ got struct task_struct [noderef] __rcu * @@
kernel/sched/rt.c:1510:15: sparse: expected struct task_struct *donor
kernel/sched/rt.c:1510:15: sparse: got struct task_struct [noderef] __rcu *
kernel/sched/rt.c:1571:45: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/rt.c:1571:45: sparse: expected struct task_struct *p
kernel/sched/rt.c:1571:45: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/rt.c:1613:39: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct task_struct *donor @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/rt.c:1613:39: sparse: expected struct task_struct *donor
kernel/sched/rt.c:1613:39: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/rt.c:1632:64: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *tsk @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/rt.c:1632:64: sparse: expected struct task_struct *tsk
kernel/sched/rt.c:1632:64: sparse: got struct task_struct [noderef] __rcu *curr
>> kernel/sched/rt.c:1971:40: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *task @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/rt.c:1971:40: sparse: expected struct task_struct *task
kernel/sched/rt.c:1971:40: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/rt.c:1994:13: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/rt.c:1994:13: sparse: struct task_struct *
kernel/sched/rt.c:1994:13: sparse: struct task_struct [noderef] __rcu *
kernel/sched/rt.c:2340:54: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *tsk @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/rt.c:2340:54: sparse: expected struct task_struct *tsk
kernel/sched/rt.c:2340:54: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/rt.c:2342:40: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/rt.c:2342:40: sparse: expected struct task_struct *p
kernel/sched/rt.c:2342:40: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/rt.c:2342:62: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/rt.c:2342:62: sparse: expected struct task_struct *p
kernel/sched/rt.c:2342:62: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/build_policy.c: note: in included file:
kernel/sched/deadline.c:2634:23: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/deadline.c:2634:23: sparse: expected struct task_struct *p
kernel/sched/deadline.c:2634:23: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/deadline.c:2644:13: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/deadline.c:2644:13: sparse: struct task_struct *
kernel/sched/deadline.c:2644:13: sparse: struct task_struct [noderef] __rcu *
kernel/sched/deadline.c:2750:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/deadline.c:2750:25: sparse: struct task_struct *
kernel/sched/deadline.c:2750:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/deadline.c:2278:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct sched_dl_entity const *b @@ got struct sched_dl_entity [noderef] __rcu * @@
kernel/sched/deadline.c:2278:42: sparse: expected struct sched_dl_entity const *b
kernel/sched/deadline.c:2278:42: sparse: got struct sched_dl_entity [noderef] __rcu *
kernel/sched/deadline.c:2288:38: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *tsk @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/deadline.c:2288:38: sparse: expected struct task_struct *tsk
kernel/sched/deadline.c:2288:38: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/deadline.c:1197:39: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/deadline.c:1197:39: sparse: expected struct task_struct *p
kernel/sched/deadline.c:1197:39: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/deadline.c:1197:85: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct sched_dl_entity const *b @@ got struct sched_dl_entity [noderef] __rcu * @@
kernel/sched/deadline.c:1197:85: sparse: expected struct sched_dl_entity const *b
kernel/sched/deadline.c:1197:85: sparse: got struct sched_dl_entity [noderef] __rcu *
kernel/sched/deadline.c:1295:23: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/deadline.c:1295:23: sparse: expected struct task_struct *p
kernel/sched/deadline.c:1295:23: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/deadline.c:1604:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/deadline.c:1604:31: sparse: expected struct task_struct *p
kernel/sched/deadline.c:1604:31: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/deadline.c:1604:70: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct sched_dl_entity const *b @@ got struct sched_dl_entity [noderef] __rcu * @@
kernel/sched/deadline.c:1604:70: sparse: expected struct sched_dl_entity const *b
kernel/sched/deadline.c:1604:70: sparse: got struct sched_dl_entity [noderef] __rcu *
kernel/sched/deadline.c:1693:39: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct task_struct *donor @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/deadline.c:1693:39: sparse: expected struct task_struct *donor
kernel/sched/deadline.c:1693:39: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/deadline.c:2495:9: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct sched_domain *[assigned] sd @@ got struct sched_domain [noderef] __rcu *parent @@
kernel/sched/deadline.c:2495:9: sparse: expected struct sched_domain *[assigned] sd
kernel/sched/deadline.c:2495:9: sparse: got struct sched_domain [noderef] __rcu *parent
kernel/sched/deadline.c:2164:14: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct *curr @@ got struct task_struct [noderef] __rcu * @@
kernel/sched/deadline.c:2164:14: sparse: expected struct task_struct *curr
kernel/sched/deadline.c:2164:14: sparse: got struct task_struct [noderef] __rcu *
kernel/sched/deadline.c:2165:15: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct *donor @@ got struct task_struct [noderef] __rcu * @@
kernel/sched/deadline.c:2165:15: sparse: expected struct task_struct *donor
kernel/sched/deadline.c:2165:15: sparse: got struct task_struct [noderef] __rcu *
kernel/sched/deadline.c:2240:43: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/deadline.c:2240:43: sparse: expected struct task_struct *p
kernel/sched/deadline.c:2240:43: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/deadline.c:2795:38: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *tsk @@ got struct task_struct [noderef] __rcu *curr @@
kernel/sched/deadline.c:2795:38: sparse: expected struct task_struct *tsk
kernel/sched/deadline.c:2795:38: sparse: got struct task_struct [noderef] __rcu *curr
kernel/sched/deadline.c:2797:23: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p @@ got struct task_struct [noderef] __rcu *donor @@
kernel/sched/deadline.c:2797:23: sparse: expected struct task_struct *p
kernel/sched/deadline.c:2797:23: sparse: got struct task_struct [noderef] __rcu *donor
kernel/sched/deadline.c:2799:44: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct sched_dl_entity const *b @@ got struct sched_dl_entity [noderef] __rcu * @@
kernel/sched/deadline.c:2799:44: sparse: expected struct sched_dl_entity const *b
kernel/sched/deadline.c:2799:44: sparse: got struct sched_dl_entity [noderef] __rcu *
kernel/sched/deadline.c:2986:23: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/deadline.c:2986:23: sparse: struct task_struct [noderef] __rcu *
kernel/sched/deadline.c:2986:23: sparse: struct task_struct *
kernel/sched/build_policy.c: note: in included file:
kernel/sched/syscalls.c:206:22: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/syscalls.c:206:22: sparse: struct task_struct [noderef] __rcu *
kernel/sched/syscalls.c:206:22: sparse: struct task_struct *
kernel/sched/build_policy.c: note: in included file:
kernel/sched/sched.h:2235:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2235:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2235:25: sparse: struct task_struct *
kernel/sched/sched.h:2235:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2235:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2235:25: sparse: struct task_struct *
kernel/sched/sched.h:2235:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2235:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2235:25: sparse: struct task_struct *
kernel/sched/sched.h:2246:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2246:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2246:26: sparse: struct task_struct *
kernel/sched/sched.h:2235:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2235:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2235:25: sparse: struct task_struct *
kernel/sched/sched.h:2235:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2235:25: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2235:25: sparse: struct task_struct *
kernel/sched/sched.h:2246:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2246:26: sparse: struct task_struct [noderef] __rcu *
kernel/sched/sched.h:2246:26: sparse: struct task_struct *
kernel/sched/sched.h:2235:25: sparse: sparse: incompatible types in comparison expression (different address spaces):
kernel/sched/sched.h:2235:25: sparse: struct task_struct [noderef] __rcu *
vim +1971 kernel/sched/rt.c
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1922
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1923 /*
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1924 * If the current CPU has more than one RT task, see if the non
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1925 * running task can migrate over to a CPU that is running a task
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1926 * of lesser priority.
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1927 */
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1928 static int push_rt_task(struct rq *rq, bool pull)
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1929 {
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1930 struct task_struct *next_task;
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1931 struct rq *lowest_rq;
311e800e16f63d kernel/sched_rt.c Hillf Danton 2011-06-16 1932 int ret = 0;
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1933
a22d7fc187ed99 kernel/sched_rt.c Gregory Haskins 2008-01-25 1934 if (!rq->rt.overloaded)
a22d7fc187ed99 kernel/sched_rt.c Gregory Haskins 2008-01-25 1935 return 0;
a22d7fc187ed99 kernel/sched_rt.c Gregory Haskins 2008-01-25 1936
917b627d4d981d kernel/sched_rt.c Gregory Haskins 2008-12-29 1937 next_task = pick_next_pushable_task(rq);
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1938 if (!next_task)
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1939 return 0;
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1940
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1941 retry:
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1942 /*
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1943 * It's possible that the next_task slipped in of
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1944 * higher priority than current. If that's the case
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1945 * just reschedule current.
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1946 */
af0c8b2bf67b25 kernel/sched/rt.c Peter Zijlstra 2024-10-09 1947 if (unlikely(next_task->prio < rq->donor->prio)) {
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1948 resched_curr(rq);
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1949 return 0;
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1950 }
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1951
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1952 if (is_migration_disabled(next_task)) {
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1953 struct task_struct *push_task = NULL;
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1954 int cpu;
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1955
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1956 if (!pull || rq->push_busy)
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1957 return 0;
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1958
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1959 /*
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1960 * Invoking find_lowest_rq() on anything but an RT task doesn't
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1961 * make sense. Per the above priority check, curr has to
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1962 * be of higher priority than next_task, so no need to
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1963 * reschedule when bailing out.
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1964 *
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1965 * Note that the stoppers are masqueraded as SCHED_FIFO
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1966 * (cf. sched_set_stop_task()), so we can't rely on rt_task().
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1967 */
af0c8b2bf67b25 kernel/sched/rt.c Peter Zijlstra 2024-10-09 1968 if (rq->donor->sched_class != &rt_sched_class)
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1969 return 0;
49bef33e4b87b7 kernel/sched/rt.c Valentin Schneider 2022-01-27 1970
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 @1971 cpu = find_lowest_rq(rq->curr);
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1972 if (cpu == -1 || cpu == rq->cpu)
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1973 return 0;
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1974
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1975 /*
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1976 * Given we found a CPU with lower priority than @next_task,
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1977 * therefore it should be running. However we cannot migrate it
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1978 * to this other CPU, instead attempt to push the current
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1979 * running task on this CPU away.
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1980 */
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1981 push_task = get_push_task(rq);
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1982 if (push_task) {
f0498d2a54e796 kernel/sched/rt.c Peter Zijlstra 2023-10-10 1983 preempt_disable();
5cb9eaa3d274f7 kernel/sched/rt.c Peter Zijlstra 2020-11-17 1984 raw_spin_rq_unlock(rq);
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1985 stop_one_cpu_nowait(rq->cpu, push_cpu_stop,
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1986 push_task, &rq->push_work);
f0498d2a54e796 kernel/sched/rt.c Peter Zijlstra 2023-10-10 1987 preempt_enable();
5cb9eaa3d274f7 kernel/sched/rt.c Peter Zijlstra 2020-11-17 1988 raw_spin_rq_lock(rq);
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1989 }
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1990
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1991 return 0;
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1992 }
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 1993
9ebc6053814d37 kernel/sched/rt.c Yangtao Li 2018-11-03 1994 if (WARN_ON(next_task == rq->curr))
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1995 return 0;
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1996
697f0a487f294e kernel/sched_rt.c Gregory Haskins 2008-01-25 1997 /* We might release rq lock */
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1998 get_task_struct(next_task);
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 1999
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2000 /* find_lock_lowest_rq locks the rq if found */
697f0a487f294e kernel/sched_rt.c Gregory Haskins 2008-01-25 2001 lowest_rq = find_lock_lowest_rq(next_task, rq);
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2002 if (!lowest_rq) {
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2003 struct task_struct *task;
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2004 /*
311e800e16f63d kernel/sched_rt.c Hillf Danton 2011-06-16 2005 * find_lock_lowest_rq releases rq->lock
1563513d34ed4b kernel/sched_rt.c Gregory Haskins 2008-12-29 2006 * so it is possible that next_task has migrated.
1563513d34ed4b kernel/sched_rt.c Gregory Haskins 2008-12-29 2007 *
1563513d34ed4b kernel/sched_rt.c Gregory Haskins 2008-12-29 2008 * We need to make sure that the task is still on the same
1563513d34ed4b kernel/sched_rt.c Gregory Haskins 2008-12-29 2009 * run-queue and is also still the next task eligible for
1563513d34ed4b kernel/sched_rt.c Gregory Haskins 2008-12-29 2010 * pushing.
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2011 */
917b627d4d981d kernel/sched_rt.c Gregory Haskins 2008-12-29 2012 task = pick_next_pushable_task(rq);
de16b91effdbf5 kernel/sched/rt.c Byungchul Park 2017-05-12 2013 if (task == next_task) {
917b627d4d981d kernel/sched_rt.c Gregory Haskins 2008-12-29 2014 /*
311e800e16f63d kernel/sched_rt.c Hillf Danton 2011-06-16 2015 * The task hasn't migrated, and is still the next
311e800e16f63d kernel/sched_rt.c Hillf Danton 2011-06-16 2016 * eligible task, but we failed to find a run-queue
311e800e16f63d kernel/sched_rt.c Hillf Danton 2011-06-16 2017 * to push it to. Do not retry in this case, since
97fb7a0a8944bd kernel/sched/rt.c Ingo Molnar 2018-03-03 2018 * other CPUs will pull from us when ready.
917b627d4d981d kernel/sched_rt.c Gregory Haskins 2008-12-29 2019 */
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2020 goto out;
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2021 }
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2022
1563513d34ed4b kernel/sched_rt.c Gregory Haskins 2008-12-29 2023 if (!task)
1563513d34ed4b kernel/sched_rt.c Gregory Haskins 2008-12-29 2024 /* No more tasks, just exit */
1563513d34ed4b kernel/sched_rt.c Gregory Haskins 2008-12-29 2025 goto out;
1563513d34ed4b kernel/sched_rt.c Gregory Haskins 2008-12-29 2026
1563513d34ed4b kernel/sched_rt.c Gregory Haskins 2008-12-29 2027 /*
1563513d34ed4b kernel/sched_rt.c Gregory Haskins 2008-12-29 2028 * Something has shifted, try again.
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2029 */
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2030 put_task_struct(next_task);
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2031 next_task = task;
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2032 goto retry;
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2033 }
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2034
2b05a0b4c08ffd kernel/sched/rt.c Connor O'Brien 2024-10-09 2035 move_queued_task_locked(rq, lowest_rq, next_task);
8875125efe8402 kernel/sched/rt.c Kirill Tkhai 2014-06-29 2036 resched_curr(lowest_rq);
a7c81556ec4d34 kernel/sched/rt.c Peter Zijlstra 2020-09-28 2037 ret = 1;
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2038
1b12bbc747560e kernel/sched_rt.c Peter Zijlstra 2008-08-11 2039 double_unlock_balance(rq, lowest_rq);
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2040 out:
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2041 put_task_struct(next_task);
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2042
311e800e16f63d kernel/sched_rt.c Hillf Danton 2011-06-16 2043 return ret;
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2044 }
e8fa136262e112 kernel/sched_rt.c Steven Rostedt 2008-01-25 2045
:::::: The code at line 1971 was first introduced by commit
:::::: a7c81556ec4d341dfdbf2cc478ead89d73e474a7 sched: Fix migrate_disable() vs rt/dl balancing
:::::: TO: Peter Zijlstra <peterz@...radead.org>
:::::: CC: Peter Zijlstra <peterz@...radead.org>
--
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