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cpuidle: haltpoll: Take 'idle=' override into account 

Currenly haltpoll isn't aware of the 'idle=' override, the priority is
'idle=poll' > haltpoll > 'idle=halt'. When 'idle=poll' is used, cpuidle
driver is bypassed but current_driver in sys still shows 'haltpoll'.

When 'idle=halt' is used, haltpoll takes precedence and makes
'idle=halt' have no effect.

Add a check to prevent the haltpoll driver from loading if 'idle=' is
present.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Co-developed-by: Joao Martins <joao.m.martins@oracle.com>
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
alistair/sunxi64-5.4-dsi
Zhenzhong Duan 2019-10-18 08:49:29 +08:00 committed by Rafael J. Wysocki
parent 7d194c2100
commit 31d851407f
1 changed files with 4 additions and 0 deletions
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4
drivers/cpuidle/cpuidle-haltpoll.c
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@ -95,6 +95,10 @@ static int __init haltpoll_init(void)
int ret;
struct cpuidle_driver *drv = &haltpoll_driver;
/* Do not load haltpoll if idle= is passed */
if (boot_option_idle_override != IDLE_NO_OVERRIDE)
return -ENODEV;
cpuidle_poll_state_init(drv);
if (!kvm_para_available() ||