Re: [PATCH v9 5/9] x86/resctrl: Unwind the errors inside rdt_enable_ctx()

[Moger, Babu]

Hi Reinette,

On 9/11/23 17:58, Reinette Chatre wrote:
> Hi Babu,
> 
> On 9/7/2023 4:51 PM, Babu Moger wrote:
>> rdt_enable_ctx() enables the features provided during resctrl mount.
>>
>> Additions to rdt_enable_ctx() are required to also modify error paths
>> of rdt_enable_ctx() callers to ensure correct unwinding if errors
>> are encountered after calling rdt_enable_ctx(). This is error prone.
>>
>> Introduce rdt_disable_ctx() to refactor the error unwinding of
>> rdt_enable_ctx() to simplify future additions. This also simplifies
>> cleanup in rdt_kill_sb().
>>
>> Remove cdp_disable_all() as it is not used anymore after the refactor.
>>
>> Suggested-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
>> Reviewed-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
>> Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
>> ---
> 
> This is one of the patches that received a change that was not
> mentioned in cover letter nor in a patch specific list of changes.

Yes. My bad.

> 
> Having a list of changes within each patch in this area is
> helpful in reviews.
> 
>>  arch/x86/kernel/cpu/resctrl/rdtgroup.c | 55 ++++++++++++++++----------
>>  1 file changed, 34 insertions(+), 21 deletions(-)
>>
>> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> index 35945b4bf196..34cb512be1de 100644
>> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
>> @@ -2290,14 +2290,6 @@ int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable)
>>  	return 0;
>>  }
>>  
>> -static void cdp_disable_all(void)
>> -{
>> -	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3))
>> -		resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
>> -	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2))
>> -		resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
>> -}
>> -
>>  /*
>>   * We don't allow rdtgroup directories to be created anywhere
>>   * except the root directory. Thus when looking for the rdtgroup
>> @@ -2377,19 +2369,44 @@ static int mkdir_mondata_all(struct kernfs_node *parent_kn,
>>  			     struct rdtgroup *prgrp,
>>  			     struct kernfs_node **mon_data_kn);
>>  
>> +static void rdt_disable_ctx(void)
>> +{
>> +	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
>> +
>> +	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
>> +
>> +	set_mba_sc(false);
>> +}
> 
> Could you please remove the empty line following each call?

Sure.

> 
> With the above change you can add:
> 
> Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
-- 
Thanks
Babu Moger