linux-kernel - Re: [PATCH v9 06/13] x86/resctrl: Add __init attribute to rdt_get_mon_l3

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Message-ID: <70e6b0a3-a18e-ff10-1df0-3b6790692bda@intel.com>
Date:   Thu, 15 Dec 2022 09:17:15 -0800
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 v9 06/13] x86/resctrl: Add __init attribute to
 rdt_get_mon_l3_config()

Hi Babu,

On 12/1/2022 7:36 AM, Babu Moger wrote:
> The function rdt_get_mon_l3_config() needs to call rdt_cpu_has() to

No need to say "The function" ... by using () after a name it is clear
that it is a function.

To support this change it could perhaps be:
"In an upcoming change rdt_get_mon_l3_config() needs to call
rdt_cpu_has() to ..."

> query the monitor related features. It cannot be called right now
> because rdt_cpu_has() has the __init attribute but rdt_get_mon_l3_config()
> doesn't. So, add the __init attribute to rdt_get_mon_l3_config() to
> resolve it.

Please place the solution description in a new paragraph and drop the "So,".
The description could also be expanded to support this change. For example:

"Add the __init attribute to rdt_get_mon_l3_config() that is only called
by get_rdt_mon_resources() that already has the __init attribute. Also
make rdt_cpu_has() available to by rdt_get_mon_l3_config() via
the internal header file."


> 
> Also, make the function rdt_cpu_has() available outside core.c file.
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---
>  arch/x86/kernel/cpu/resctrl/core.c     |    2 +-
>  arch/x86/kernel/cpu/resctrl/internal.h |    1 +
>  arch/x86/kernel/cpu/resctrl/monitor.c  |    2 +-
>  3 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
> index b4fc851f6489..030d3b409768 100644
> --- a/arch/x86/kernel/cpu/resctrl/core.c
> +++ b/arch/x86/kernel/cpu/resctrl/core.c
> @@ -728,7 +728,7 @@ static int __init set_rdt_options(char *str)
>  }
>  __setup("rdt", set_rdt_options);
>  
> -static bool __init rdt_cpu_has(int flag)
> +bool __init rdt_cpu_has(int flag)
>  {
>  	bool ret = boot_cpu_has(flag);
>  	struct rdt_options *o;
> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index fdbbf66312ec..7bbfc10094b6 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -512,6 +512,7 @@ void closid_free(int closid);
>  int alloc_rmid(void);
>  void free_rmid(u32 rmid);
>  int rdt_get_mon_l3_config(struct rdt_resource *r);
> +bool rdt_cpu_has(int flag);

Please also add __init attribute here by using the same style as the other functions
in this file that need __init.

>  void mon_event_count(void *info);
>  int rdtgroup_mondata_show(struct seq_file *m, void *arg);
>  void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
> diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
> index efe0c30d3a12..e33e8d8bd796 100644
> --- a/arch/x86/kernel/cpu/resctrl/monitor.c
> +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
> @@ -746,7 +746,7 @@ static void l3_mon_evt_init(struct rdt_resource *r)
>  		list_add_tail(&mbm_local_event.list, &r->evt_list);
>  }
>  
> -int rdt_get_mon_l3_config(struct rdt_resource *r)
> +int __init rdt_get_mon_l3_config(struct rdt_resource *r)
>  {
>  	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
>  	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
> 
> 

Thank you

Reinette