linux-kernel - Re: [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoi type IRQ handlers

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: <1164042079.3028.29.camel@localhost.localdomain>
Date:	Mon, 20 Nov 2006 09:01:19 -0800
From:	Daniel Walker <dwalker@...sta.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoi
	type IRQ handlers

On Mon, 2006-11-20 at 17:42 +0100, Ingo Molnar wrote:
> * Daniel Walker <dwalker@...sta.com> wrote:
> 
> > It makes porting to powerpc for instance harder because some 
> > controllers have ack(), and some don't.. Some have mask(), and some 
> > don't.. So you end up with what Sergei is doing which is flat out make 
> > ack == eoi .. Where you have multiple irq chip types each one really 
> > needs an individual evaluation ..
> 
> this isnt really a problem. The current situation is simply hacky, 
> because right now there's no 'threaded' flow type at all. The x86 code 
> just moves the code away from fasteoi:
> 
>  #ifdef CONFIG_PREEMPT_HARDIRQS
>                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
>                                             handle_level_irq, "level-threaded");#else
>                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
>                                               handle_fasteoi_irq, "fasteoi");
>  #endif
> 
> what should happen is a handle_thread_irq irq-flow handler that will 
> first mask, and then ack or eoi (whichever callbacks is available), and 
> thus can and will handle both fasteoi, edge and level irqs.

If it still calls for arch level changes, I have an aversion to those ..
Maybe if it was internal to the set_irq_chip_and_handler_name() macro?

Daniel

-
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/