linux-kernel - Re: [PATCH] x86/cpu: Reinitialize IA32_FEAT

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Date:   Mon, 8 Jun 2020 21:20:16 +0800
From:   Brad Campbell <lists2009@...rfbargle.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        kernel test robot <lkp@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, kbuild-all@...ts.01.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH] x86/cpu: Reinitialize IA32_FEAT_CTL MSR on BSP during
 wakeup

G'day Sean,

With the addition of this patch on a vanilla v5.7 :
Tested-by: Brad Campbell <lists2009@...rfbargle.com>

On 8/6/20 12:34 am, Sean Christopherson wrote:
> On Sat, Jun 06, 2020 at 05:08:38AM +0800, kernel test robot wrote:
>   arch/x86/kernel/cpu/centaur.c: In function 'init_centaur':
>>>> arch/x86/kernel/cpu/centaur.c:219:2: error: implicit declaration of function 'init_ia32_feat_ctl' [-Werror=implicit-function-declaration]
>> 219 |  init_ia32_feat_ctl(c);
>> |  ^~~~~~~~~~~~~~~~~~
>> cc1: some warnings being treated as errors
>> --
>> arch/x86/kernel/cpu/zhaoxin.c: In function 'init_zhaoxin':
>>>> arch/x86/kernel/cpu/zhaoxin.c:110:2: error: implicit declaration of function 'init_ia32_feat_ctl' [-Werror=implicit-function-declaration]
>> 110 |  init_ia32_feat_ctl(c);
>> |  ^~~~~~~~~~~~~~~~~~
>> cc1: some warnings being treated as errors
> 
> Blech, zhaoxin.c an centaur.c don't include asm/cpu.h, and I (obviously)
> don't have them enabled in my configs.  I'll wait a day or two more before
> sending v2.
> diff --git a/arch/x86/kernel/cpu/centaur.c b/arch/x86/kernel/cpu/centaur.c
> index 426792565d86..c5cf336e5077 100644
> --- a/arch/x86/kernel/cpu/centaur.c
> +++ b/arch/x86/kernel/cpu/centaur.c
> @@ -3,6 +3,7 @@
>   #include <linux/sched.h>
>   #include <linux/sched/clock.h>
> 
> +#include <asm/cpu.h>
>   #include <asm/cpufeature.h>
>   #include <asm/e820/api.h>
>   #include <asm/mtrr.h>
> diff --git a/arch/x86/kernel/cpu/zhaoxin.c b/arch/x86/kernel/cpu/zhaoxin.c
> index df1358ba622b..05fa4ef63490 100644
> --- a/arch/x86/kernel/cpu/zhaoxin.c
> +++ b/arch/x86/kernel/cpu/zhaoxin.c
> @@ -2,6 +2,7 @@
>   #include <linux/sched.h>
>   #include <linux/sched/clock.h>
> 
> +#include <asm/cpu.h>
>   #include <asm/cpufeature.h>
> 
>   #include "cpu.h"
> 
>