linux-kernel - Re: [PATCH] mm: fix up a spurious page fault whenever it happens

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: <519E3089.8040701@zytor.com>
Date:	Thu, 23 May 2013 08:06:49 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Rik van Riel <riel@...hat.com>,
	Stanislav Meduna <stano@...una.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Hai Huang <hhuang@...hat.com>
Subject: Re: [PATCH] mm: fix up a spurious page fault whenever it happens

On 05/23/2013 06:29 AM, Steven Rostedt wrote:
> On Thu, 2013-05-23 at 08:19 -0400, Rik van Riel wrote:
> 
>> We can add a bit in the architecture bits that
>> we use to check against other CPU and system
>> errata, and conditionally flush the whole TLB
>> from __native_flush_tlb_single().
> 
> If we find that some CPUs have issues and others do not, and we can
> determine this by checking the CPU type at run time, I would strongly
> suggest using the jump_label infrastructure to do the branches. I know
> this is early to suggest something like this, but I just wanted to put
> it in your head ;-)
> 

We don't even need the jump_label infrastructure -- we have
static_cpu_has*() which actually predates jump_label although it uses
the same underlying ideas.

	-hpa


--
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/