linux-kernel - Re: [PATCH] Prevent nested interrupts when the IRQ stack is near overflowing v2

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:	Thu, 25 Mar 2010 19:23:58 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>, jesse.brandeburg@...el.com,
	Arjan Van De Ven <arjan@...radead.org>
Subject: Re: [PATCH] Prevent nested interrupts when the IRQ stack is near
 overflowing v2

On Thu, 2010-03-25 at 19:21 +0100, Peter Zijlstra wrote:
> On Thu, 2010-03-25 at 11:01 -0700, Linus Torvalds wrote:
> > Are there any cases around 
> > that still have busy-loop delays based on real-time in their irq handlers? 
> > I simply don't know. 
> 
> I recently found a few in drivers/net/ there's all kinds of funny stuff
> in there.. not sure how common the matching hardware is though.
> 
> One thing we could do is instrument jiffies to yell when its used from
> hardirq context and fix up these things.

Also, Arjan mentioned he wanted to sweep the kernel for jiffies users
and convert them to timer interfaces..

--
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/