linux-kernel - Re: [patch] genapic: optimize & fix APIC mode setup

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]

Date:	Mon, 13 Nov 2006 09:16:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <ak@...e.de>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	ashok.raj@...el.com
Subject: Re: [patch] genapic: optimize & fix APIC mode setup

* Andi Kleen <ak@...e.de> wrote:

> Now if it causes device driver issues that's different of course. I 
> wasn't aware of this before.

lets try my patch in -mm for a while.

Had i ever noticed this hack in the first place i would have NAK-ed it. 
There is a fundamental design friction of a high-level feature like 
HOTPLUG_CPU /requiring/ a fundamental change to the lowlevel IRQ 
delivery mode! Such a requirement is broken and just serves to hide a 
flaw in the hotplug design - which flaw would trigger on i386 /anyway/, 
because i386 still uses logical delivery mode for APIC IPIs. Also, i'd 
like to have a description of how to reproduce those CPU hotplug 
problems, so that i can try to fix it.

	Ingo
-
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/