linux-kernel - Re: [PATCH v3 2/7] x86/resctrl: Remove few unnecessary rftype flags

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Date:   Wed, 15 Mar 2023 11:33:43 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Babu Moger <babu.moger@....com>, <corbet@....net>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>
CC:     <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 v3 2/7] x86/resctrl: Remove few unnecessary rftype flags

Hi Babu,

On 3/2/2023 12:24 PM, Babu Moger wrote:
> Remove few unnecessary rftype flags and simplify the code. This is done

Please drop "few" (here and in subject).

> to further cleanup the code eventually.

Could you please be specific? "further cleanup the code
eventually" is too vague. I do not understand what is meant
with the second sentence.

> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---
>  arch/x86/kernel/cpu/resctrl/internal.h |    9 +++------
>  arch/x86/kernel/cpu/resctrl/rdtgroup.c |   10 +++++++---
>  2 files changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index 8edecc5763d8..571145d75d29 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 15ea5b550fe9..3c86506e54c1 100644
> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> @@ -3163,7 +3163,7 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
>  {
>  	struct rdtgroup *prdtgrp, *rdtgrp;
>  	struct kernfs_node *kn;
> -	uint files = 0;
> +	uint fflags = 0;

Hoe does changing the variable name from "files" to "fflags" simplify
the code?

>  	int ret;
>  
>  	prdtgrp = rdtgroup_kn_lock_live(parent_kn);
> @@ -3215,8 +3215,12 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
>  		goto out_destroy;
>  	}
>  
> -	files = RFTYPE_BASE | BIT(RF_CTRLSHIFT + rtype);
> -	ret = rdtgroup_add_files(kn, files);
> +	if (rtype == RDTCTRL_GROUP)
> +		fflags = RFTYPE_BASE | RFTYPE_CTRL;
> +	else
> +		fflags = RFTYPE_BASE | RFTYPE_MON;
> +
> +	ret = rdtgroup_add_files(kn, fflags);
>  	if (ret) {
>  		rdt_last_cmd_puts("kernfs fill error\n");
>  		goto out_destroy;
> 
> 

Reinette