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Power management fixes for 5.9-rc8

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- Fix up RCU usage for cpuidle on the ARM imx6q platform (Ulf
    Hansson).
 
  - Fix typo in the PM documentation (Yoann Congal).
 
  - Add return statement that is missing after recent changes
    in the intel_pstate driver (Zhang Rui).
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Merge tag 'pm-5.9-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix one more issue related to the recent RCU-lockdep changes, a
  typo in documentation and add a missing return statement to
  intel_pstate.

  Specifics:

   - Fix up RCU usage for cpuidle on the ARM imx6q platform (Ulf
     Hansson)

   - Fix typo in the PM documentation (Yoann Congal)

   - Add return statement that is missing after recent changes in the
     intel_pstate driver (Zhang Rui)"

* tag 'pm-5.9-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ARM: imx6q: Fixup RCU usage for cpuidle
  Documentation: PM: Fix a reStructuredText syntax error
  cpufreq: intel_pstate: Fix missing return statement
This commit is contained in:
Linus Torvalds 2020-10-02 10:05:56 -07:00
commit c513091103
3 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/admin-guide/pm/cpuidle.rst
View File

@ -690,7 +690,7 @@ which of the two parameters is added to the kernel command line. In the
instruction of the CPUs (which, as a rule, suspends the execution of the program
and causes the hardware to attempt to enter the shallowest available idle state)
for this purpose, and if ``idle=poll`` is used, idle CPUs will execute a
more or less ``lightweight'' sequence of instructions in a tight loop. [Note
more or less "lightweight" sequence of instructions in a tight loop. [Note
that using ``idle=poll`` is somewhat drastic in many cases, as preventing idle
CPUs from saving almost any energy at all may not be the only effect of it.
For example, on Intel hardware it effectively prevents CPUs from using

4
arch/arm/mach-imx/cpuidle-imx6q.c
View File

@ -24,7 +24,9 @@ static int imx6q_enter_wait(struct cpuidle_device *dev,
imx6_set_lpm(WAIT_UNCLOCKED);
raw_spin_unlock(&cpuidle_lock);
rcu_idle_enter();
cpu_do_idle();
rcu_idle_exit();
raw_spin_lock(&cpuidle_lock);
if (num_idle_cpus-- == num_online_cpus())
@ -44,7 +46,7 @@ static struct cpuidle_driver imx6q_cpuidle_driver = {
{
.exit_latency = 50,
.target_residency = 75,
.flags = CPUIDLE_FLAG_TIMER_STOP,
.flags = CPUIDLE_FLAG_TIMER_STOP | CPUIDLE_FLAG_RCU_IDLE,
.enter = imx6q_enter_wait,
.name = "WAIT",
.desc = "Clock off",

1
drivers/cpufreq/intel_pstate.c
View File

@ -2781,6 +2781,7 @@ static int intel_pstate_update_status(const char *buf, size_t size)
cpufreq_unregister_driver(intel_pstate_driver);
intel_pstate_driver_cleanup();
return 0;
}
if (size == 6 && !strncmp(buf, "active", size)) {