linux-kernel - Re: [PATCH v10 02/10] x86/resctrl: Simplify rftype flag definitions

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Date:   Fri, 29 Sep 2023 18:09:59 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Babu Moger <babu.moger@....com>
cc:     corbet@....net, reinette.chatre@...el.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, fenghua.yu@...el.com,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        paulmck@...nel.org, akpm@...ux-foundation.org,
        quic_neeraju@...cinc.com, rdunlap@...radead.org,
        damien.lemoal@...nsource.wdc.com, songmuchun@...edance.com,
        peterz@...radead.org, jpoimboe@...nel.org, pbonzini@...hat.com,
        chang.seok.bae@...el.com, pawan.kumar.gupta@...ux.intel.com,
        jmattson@...gle.com, daniel.sneddon@...ux.intel.com,
        sandipan.das@....com, tony.luck@...el.com, james.morse@....com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        bagasdotme@...il.com, eranian@...gle.com,
        christophe.leroy@...roup.eu, jarkko@...nel.org,
        adrian.hunter@...el.com, quic_jiles@...cinc.com,
        peternewman@...gle.com
Subject: Re: [PATCH v10 02/10] x86/resctrl: Simplify rftype flag
 definitions

On Fri, 15 Sep 2023, Babu Moger wrote:

> The rftype flags are bitmaps used for adding files under resctrl
> filesystem. Some of these bitmaps have one extra level of indirection
> which is not necessary.
> 
> Make them all direct definition to be consistent and easier to read.
> 
> Reviewed-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
> Tested-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
> Reviewed-by: Fenghua Yu <fenghua.yu@...el.com>
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---
>  arch/x86/kernel/cpu/resctrl/internal.h | 9 +++------
>  arch/x86/kernel/cpu/resctrl/rdtgroup.c | 6 +++++-
>  2 files changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index 85ceaf9a31ac..62767774810d 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -243,12 +243,9 @@ struct rdtgroup {
>   */
>  #define RFTYPE_INFO			BIT(0)
>  #define RFTYPE_BASE			BIT(1)
> -#define RF_CTRLSHIFT			4
> -#define RF_MONSHIFT			5
> -#define RF_TOPSHIFT			6
> -#define RFTYPE_CTRL			BIT(RF_CTRLSHIFT)
> -#define RFTYPE_MON			BIT(RF_MONSHIFT)
> -#define RFTYPE_TOP			BIT(RF_TOPSHIFT)
> +#define RFTYPE_CTRL			BIT(4)
> +#define RFTYPE_MON			BIT(5)
> +#define RFTYPE_TOP			BIT(6)
>  #define RFTYPE_RES_CACHE		BIT(8)
>  #define RFTYPE_RES_MB			BIT(9)
>  #define RF_CTRL_INFO			(RFTYPE_INFO | RFTYPE_CTRL)
> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> index f0d163950969..7ddfa4b470e6 100644
> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> @@ -3242,7 +3242,11 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
>  		goto out_destroy;
>  	}
>  
> -	files = RFTYPE_BASE | BIT(RF_CTRLSHIFT + rtype);
> +	if (rtype == RDTCTRL_GROUP)
> +		files = RFTYPE_BASE | RFTYPE_CTRL;
> +	else
> +		files = RFTYPE_BASE | RFTYPE_MON;
> +
>  	ret = rdtgroup_add_files(kn, files);
>  	if (ret) {
>  		rdt_last_cmd_puts("kernfs fill error\n");
> 

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.