Re: [RFC PATCH] rcu: don't ignore preempt_disable() in the idle loop

[Lai Jiangshan]

Paul E. McKenney wrote:
>>
>> This is another try, it uses the fact that idle loops
>> are executing with preept_count()=1.
>> But I didn't look deep into all idle loops.
> 
> Hello, Lai!
> 
> One question below...
> 
> 						Thanx, Paul
> 

[...]

>> +
>> +	if ((preempt_count() & PREEMPT_MASK) > IDLE_CORE_LOOP_PREEMPT_COUNT)
>> +		return 0;
> 
> How does this work in CONFIG_PREEMPT=n kernels?  I don't see how it
> does, regardless of what preempt_count() returns in this case.
> 
>

You are right, It cannot work in CONFIG_PREEMPT=n kernels.
ignore this stupid patch.

Thanx, Lai
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