linux-kernel - Re: [PATCH V2] perf/x86: Consider pinned events for group validation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190822185522.GE5447@tassilo.jf.intel.com>
Date:   Thu, 22 Aug 2019 11:55:22 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     kan.liang@...ux.intel.com, peterz@...radead.org, mingo@...hat.com,
        acme@...nel.org, linux-kernel@...r.kernel.org, eranian@...gle.com
Subject: Re: [PATCH V2] perf/x86: Consider pinned events for group validation

On Thu, Aug 22, 2019 at 08:29:46PM +0200, Thomas Gleixner wrote:
> On Thu, 22 Aug 2019, Andi Kleen wrote:
> 
> > > +	/*
> > > +	 * Disable interrupts to prevent the events in this CPU's cpuc
> > > +	 * going away and getting freed.
> > > +	 */
> > > +	local_irq_save(flags);
> > 
> > I believe it's also needed to disable preemption. Probably should
> > add a comment, or better an explicit preempt_disable() too.
> 
> Preemption is implicit disabled by disabling interrupts.

Yes it is, this is more for documentation.

-Andi