cpuidle: Do not access cpuidle_devices when !CONFIG_CPU_IDLE

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commit 9bd616e3db upstream.

The cpuidle_devices per-CPU variable is only defined when CPU_IDLE is
enabled. Commit c8cc7d4de7 ("sched/idle: Reorganize the idle loop")
removed the #ifdef CONFIG_CPU_IDLE around cpuidle_idle_call() with the
compiler optimising away __this_cpu_read(cpuidle_devices). However, with
CONFIG_UBSAN && !CONFIG_CPU_IDLE, this optimisation no longer happens
and the kernel fails to link since cpuidle_devices is not defined.

This patch introduces an accessor function for the current CPU cpuidle
device (returning NULL when !CONFIG_CPU_IDLE) and uses it in
cpuidle_idle_call().

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Catalin Marinas 2016-06-01 18:52:16 +01:00 • committed by Ben Hutchings

parent 7e6fc0b317

commit aa8d445cbb

2 changed files with 4 additions and 1 deletions

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3

include/linux/cpuidle.h

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2

kernel/sched/idle.c

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