linux-kernel - Re: [PATCH 2/2] s390/mm: use ipte range to invalidate multiple page table entries

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] [day] [month] [year] [list]

Message-Id: <20160706125112.6cdf8262@mschwide>
Date:	Wed, 6 Jul 2016 12:51:12 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	"Hillf Danton" <hillf.zj@...baba-inc.com>
Cc:	"'linux-kernel'" <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>
Subject: Re: [PATCH 2/2] s390/mm: use ipte range to invalidate multiple page
 table entries

On Wed, 06 Jul 2016 17:26:08 +0800
"Hillf Danton" <hillf.zj@...baba-inc.com> wrote:

> > 
> > You are still a bit cryptic, 
> >
> Sorry, Sir, simply because I'm not native English speaker.
> 
> > are you trying to tell me that your hint is
> > about trying to avoid the preempt_enable() call?
> > 
> Yes, since we are already in the context with page table lock held.

Ok, got it. An option would be to drop the preempt_disable/preempt_enable,
add "BUG_ON(preemptible())" and use raw_smp_processor_id. But I wonder if
it is worth the effort.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.