linux-kernel - Re: [PATCH v1] ARM: Silence proc-v7-bugs.c spam about disabled Spectre workarounds

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Message-ID: <253e9ec1-bcd8-c790-95b8-afbcc21e7163@collabora.com>
Date:   Tue, 28 Jun 2022 10:23:06 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Russell King <rmk+kernel@...linux.org.uk>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] ARM: Silence proc-v7-bugs.c spam about disabled
 Spectre workarounds

On 5/19/22 19:13, Dmitry Osipenko wrote:
> Print message about disabled Spectre workarounds only once to stop
> endless spam into KSMG each time CPU goes out from idling state.
> This spam makes system unusable with CONFIG_HARDEN_BRANCH_PREDICTOR=n
> for those who don't care about security and wants maximum performance.
> 
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> ---
>  arch/arm/mm/proc-v7-bugs.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/arm/mm/proc-v7-bugs.c b/arch/arm/mm/proc-v7-bugs.c
> index fb9f3eb6bf48..f9730eba0632 100644
> --- a/arch/arm/mm/proc-v7-bugs.c
> +++ b/arch/arm/mm/proc-v7-bugs.c
> @@ -108,8 +108,7 @@ static unsigned int spectre_v2_install_workaround(unsigned int method)
>  #else
>  static unsigned int spectre_v2_install_workaround(unsigned int method)
>  {
> -	pr_info("CPU%u: Spectre V2: workarounds disabled by configuration\n",
> -		smp_processor_id());
> +	pr_info_once("Spectre V2: workarounds disabled by configuration\n");
>  
>  	return SPECTRE_VULNERABLE;
>  }

Hello Russell,

Could you please apply this patch? I tried to use yours patch tracker
today and it doesn't allow me to recover my password (server error: MAIL
FROM command failed Detail: Space shortage).

Thanks!

-- 
Best regards,
Dmitry