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: <20140910163556.GE4783@worktop.ger.corp.intel.com>
Date:	Wed, 10 Sep 2014 18:35:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, eranian@...gle.com,
	tglx@...utronix.de, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, x86: Fall back to vmalloc for BTS buffer allocation

On Wed, Sep 10, 2014 at 04:40:12PM +0200, Andi Kleen wrote:
> > We did this once, and that blew up big time.
> > 
> > Even now, vmalloc_fault() has a very explicit:
> > 
> >   WARN_ON_ONCE(in_nmi());
> > 
> > So this isn't going to happen until you fix that.
> 
> Good point.
> 
> We just need to call vmalloc_sync_all at allocation time,
> no need to change vmalloc_fault.

Somehow that wasn't considered adequate, but lemme try and dig out that
thread. It should be somewhere...

https://lkml.org/lkml/2010/7/14/465


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ