From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>, Ingo Molnar <mingo@elte.hu>,
Thomas Gleixner <tglx@linutronix.de>,
Dhaval Giani <dhaval@linux.vnet.ibm.com>,
Mike Travis <travis@sgi.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 00/16] dyn_array and nr_irqs support v2
Date: Sat, 02 Aug 2008 08:41:03 -0700 [thread overview]
Message-ID: <4894800F.40802@zytor.com> (raw)
In-Reply-To: <m14p64gh81.fsf@frodo.ebiederm.org>
Eric W. Biederman wrote:
>
> Yes. I want the option of using those bits. It might not be smart to
> use them to encode a physical location and the irq number but just
> having the option would be nice.
>
Urk! First of all, there isn't enough space as we have already proven
(on the machines where it actually matters there just aren't enough
bits), but doing this kind of stuff *optionally* is going to hurt even
worse.
Furthermore, this crap will break anyway the *next* time someone comes
up with a new clever way to do interrupts -- and to truly get stable
identifiers, we can't treat HyperTransport MSI as APICs anymore, yadda,
yadda...
> Making /proc/interrupts useful without breaking user space is going to be
> an interesting challenge one of these days.
If changing to non-numbers in /proc/interrupts will break userspace,
then userspace will have to deal with a numeric token in
/proc/interrupts which will have to be looked up elsewhere (perhaps in a
sysfs directory) to get a more meaningful index.
-hpa
next prev parent reply other threads:[~2008-08-02 15:42 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-01 9:37 [PATCH 00/16] dyn_array and nr_irqs support v2 Yinghai Lu
2008-08-01 9:37 ` [PATCH 01/16] x86: 64bit support more than 256 irq Yinghai Lu
2008-08-01 9:37 ` [PATCH 02/16] x86: introduce nr_irqs for 64bit v3 Yinghai Lu
2008-08-01 9:37 ` [PATCH 03/16] add dyn_array support Yinghai Lu
2008-08-01 9:37 ` [PATCH 04/16] make irq_timer_state to use dyn_array Yinghai Lu
2008-08-01 9:37 ` [PATCH 05/16] make irq2_iommu " Yinghai Lu
2008-08-01 9:37 ` [PATCH 06/16] make irq_desc " Yinghai Lu
2008-08-01 9:37 ` [PATCH 07/16] x86: make 64bit support dyn_array Yinghai Lu
2008-08-01 9:37 ` [PATCH 08/16] serial: change remove NR_IRQS in 8250.c v2 Yinghai Lu
2008-08-01 9:37 ` [PATCH 09/16] add per_cpu_dyn_array support Yinghai Lu
2008-08-01 9:37 ` [PATCH 10/16] irq: make irqs in kernel stat use per_cpu_dyn_array Yinghai Lu
2008-08-01 9:37 ` [PATCH 11/16] x86 remove irq_vectors_limit.h Yinghai Lu
2008-08-01 9:37 ` [PATCH 12/16] x86: make 32bit use dyn_array Yinghai Lu
2008-08-01 9:37 ` [PATCH 13/16] add per_cpu_dyn_array for arch percpu support Yinghai Lu
2008-08-01 9:37 ` [PATCH 14/16] x86: get mp_irqs from madt Yinghai Lu
2008-08-01 9:37 ` [PATCH 15/16] x86: make 32bit more like with io_apic/dyn_array to 64 bit Yinghai Lu
2008-08-01 9:37 ` [PATCH 16/16] x86: alloc dyn_array all alltogether Yinghai Lu
2008-08-01 20:46 ` [PATCH 00/16] dyn_array and nr_irqs support v2 Eric W. Biederman
2008-08-01 21:30 ` Yinghai Lu
2008-08-01 21:57 ` Yinghai Lu
2008-08-01 22:45 ` Eric W. Biederman
2008-08-01 22:10 ` Yinghai Lu
2008-08-01 22:38 ` Eric W. Biederman
2008-08-02 1:09 ` Yinghai Lu
2008-08-02 1:36 ` H. Peter Anvin
2008-08-02 1:41 ` Eric W. Biederman
2008-08-02 2:01 ` Yinghai Lu
2008-08-02 2:03 ` H. Peter Anvin
2008-08-02 2:39 ` Eric W. Biederman
2008-08-02 3:28 ` H. Peter Anvin
2008-08-02 4:42 ` Eric W. Biederman
2008-08-02 15:41 ` H. Peter Anvin [this message]
2008-08-02 20:20 ` Eric W. Biederman
2008-08-04 12:57 ` Mike Travis
2008-08-05 2:38 ` H. Peter Anvin
2008-08-05 3:40 ` Eric W. Biederman
2008-08-05 3:48 ` H. Peter Anvin
2008-08-01 21:47 ` Mike Travis
2008-08-02 2:58 ` Yinghai Lu
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