* [PATCH v2] cpuidle-haltpoll: make haltpoll aware of 'idle=' override
@ 2019-10-18 0:49 Zhenzhong Duan
0 siblings, 0 replies; only message in thread
From: Zhenzhong Duan @ 2019-10-18 0:49 UTC (permalink / raw)
To: linux-kernel
Cc: rjw, daniel.lezcano, linux-pm, mtosatti, Zhenzhong Duan, Joao Martins
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 take precedence and make 'idle=halt'
no effect.
Add a check to not load haltpoll driver if there is 'idle='.
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
---
v2: remove #if guard per Rafael
drivers/cpuidle/cpuidle-haltpoll.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/cpuidle/cpuidle-haltpoll.c b/drivers/cpuidle/cpuidle-haltpoll.c
index 932390b..b0ce9bc 100644
--- a/drivers/cpuidle/cpuidle-haltpoll.c
+++ b/drivers/cpuidle/cpuidle-haltpoll.c
@@ -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() ||
--
1.8.3.1
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