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

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Date:   Tue, 28 Jun 2022 08:31:25 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
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 Tue, Jun 28, 2022 at 10:23:06AM +0300, Dmitry Osipenko wrote:
> 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).

That should now be working - thanks to apt needlessly consuming 200MB of
space. Please use the patch system, thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!