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anolis: cpuidle: Do not call default idle in idle=halt and haltpoll 

ANBZ: #10852

There're 3 considerations:
1. In tdx scenarios, hlt instruction causes #VE exception to emulate
   hlt, that will make hlt in exception context which may leads to RCU
   grace period lag. In that case, kernel can boot very slowly
2. x86_idle could be overridden, do not set it default_idle() again
3. arch_cpu_idle() can use something like mwait.

Signed-off-by: Zelin Deng <zelin.deng@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/3833
This commit is contained in:
Zelin Deng 2024-09-13 17:44:29 +08:00
parent ebb84867c5
commit 3f325c5eb3
2 changed files with 2 additions and 2 deletions
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2
arch/x86/kernel/process.c
View File

@ -729,6 +729,7 @@ void arch_cpu_idle(void)
{
x86_idle();
}
EXPORT_SYMBOL(arch_cpu_idle);
/*
* We use this if we don't have any better idle routine..
@ -952,7 +953,6 @@ static int __init idle_setup(char *str)
* To continue to load the CPU idle driver, don't touch
* the boot_option_idle_override.
*/
x86_idle = default_idle;
boot_option_idle_override = IDLE_HALT;
} else if (!strcmp(str, "nomwait")) {
/*

2
drivers/cpuidle/cpuidle-haltpoll.c
View File

@ -32,7 +32,7 @@ static int default_enter_idle(struct cpuidle_device *dev,
local_irq_enable();
return index;
}
default_idle();
arch_cpu_idle();
return index;
}