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Odin Ugedal 2a47e0719a sched/fair: Fix CFS bandwidth hrtimer expiry type 
[ Upstream commit 72d0ad7cb5bad265adb2014dbe46c4ccb11afaba ]

The time remaining until expiry of the refresh_timer can be negative.
Casting the type to an unsigned 64-bit value will cause integer
underflow, making the runtime_refresh_within return false instead of
true. These situations are rare, but they do happen.

This does not cause user-facing issues or errors; other than
possibly unthrottling cfs_rq's using runtime from the previous period(s),
making the CFS bandwidth enforcement less strict in those (special)
situations.

Signed-off-by: Odin Ugedal <odin@uged.al>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ben Segall <bsegall@google.com>
Link: https://lore.kernel.org/r/20210629121452.18429-1-odin@uged.al
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2021-07-25 14:35:13 +02:00
..
Makefile psi: pressure stall information for CPU, memory, and IO 2018-10-26 16:26:32 -07:00
autogroup.c sched/autogroup: Make autogroup_path() always available 2019-06-24 19:23:40 +02:00
autogroup.h sched/headers: Simplify and clean up header usage in the scheduler 2018-03-04 12:39:29 +01:00
clock.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
completion.c sched/Documentation: Update wake_up() & co. memory-barrier guarantees 2018-07-17 09:30:34 +02:00
core.c sched/uclamp: Fix uclamp_tg_restrict() 2021-07-14 16:53:24 +02:00
cpuacct.c sched/headers: Simplify and clean up header usage in the scheduler 2018-03-04 12:39:29 +01:00
cpudeadline.c Linux 5.2-rc5 2019-06-17 12:12:27 +02:00
cpudeadline.h sched/headers: Simplify and clean up header usage in the scheduler 2018-03-04 12:39:29 +01:00
cpufreq.c cpufreq: Avoid leaving stale IRQ work items during CPU offline 2019-12-31 16:46:06 +01:00
cpufreq_schedutil.c sched/uclamp: Protect uclamp fast path code with static key 2020-09-03 11:26:49 +02:00
cpupri.c Linux 5.2-rc5 2019-06-17 12:12:27 +02:00
cpupri.h sched/headers: Simplify and clean up header usage in the scheduler 2018-03-04 12:39:29 +01:00
cputime.c sched/vtime: Fix guest/system mis-accounting on task switch 2019-10-09 12:38:03 +02:00
deadline.c sched/rt: Fix Deadline utilization tracking during policy change 2021-07-14 16:53:24 +02:00
debug.c sched/debug: Fix cgroup_path[] serialization 2021-05-14 09:44:26 +02:00
fair.c sched/fair: Fix CFS bandwidth hrtimer expiry type 2021-07-25 14:35:13 +02:00
features.h sched/fair: Replace source_load() & target_load() with weighted_cpuload() 2019-06-03 11:49:39 +02:00
idle.c rcu/nocb: Perform deferred wake up before last idle's need_resched() check 2021-03-04 10:26:47 +01:00
isolation.c sched/isolation: Prefer housekeeping CPU in local node 2019-07-25 15:51:55 +02:00
loadavg.c timers/nohz: Update NOHZ load in remote tick 2020-03-05 16:43:36 +01:00
membarrier.c sched/membarrier: fix missing local execution of ipi_sync_rq_state() 2021-03-17 17:03:57 +01:00
pelt.c sched/debug: Add new tracepoint to track PELT at se level 2019-06-24 19:23:42 +02:00
pelt.h sched/topology: Remove unused 'sd' parameter from arch_scale_cpu_capacity() 2019-06-24 19:23:39 +02:00
psi.c sched/psi: Fix OOB write when writing 0 bytes to PSI files 2020-02-28 17:22:21 +01:00
rt.c sched/rt: Fix RT utilization tracking during policy change 2021-07-14 16:53:24 +02:00
sched-pelt.h sched/fair: Fix "runnable_avg_yN_inv" not used warnings 2019-06-17 12:15:58 +02:00
sched.h sched/features: Fix hrtick reprogramming 2021-03-07 12:20:47 +01:00
stats.c proc: introduce proc_create_seq{,_data} 2018-05-16 07:23:35 +02:00
stats.h sched/stats: Fix unlikely() use of sched_info_on() 2019-07-25 15:51:55 +02:00
stop_task.c sched/core: Further clarify sched_class::set_next_task() 2020-01-26 10:01:03 +01:00
swait.c kernel/sched/: remove caller signal_pending branch predictions 2019-01-04 13:13:48 -08:00
topology.c sched: correct SD_flags returned by tl->sd_flags() 2020-08-19 08:15:54 +02:00
wait.c rq-qos: fix missed wake-ups in rq_qos_throttle try two 2021-07-19 08:53:16 +02:00
wait_bit.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00