linux-kernel - Re: [patch] clockevents: drivers for i386, fix #2

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: <1159960776.1386.244.camel@localhost.localdomain>
Date:	Wed, 04 Oct 2006 13:19:35 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...l.org>, LKML <linux-kernel@...r.kernel.org>,
	Jim Gettys <jg@...top.org>, John Stultz <johnstul@...ibm.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: [patch] clockevents: drivers for i386, fix #2

On Wed, 2006-10-04 at 12:53 +0200, Ingo Molnar wrote:
> there's one material difference we just found: in the !hres case we'll 
> do the timer IRQ handling mostly from the lapic vector - while in 
> mainline we do it from the irq0 vector. So, how does your 
> /proc/interrupts look like? How frequently does LOC increase, and how 
> frequently does IRQ 0 increase?
> 
> (meanwhile we'll fix and restore things so that it matches mainline 
> behavior.)

Andrew, does the patch below fix your problem ?

You should see the same weird behaviour when you run a plain -mm3 with
CONFIG_SMP=y on that box. This moves update_process_times() to the lapic
too.
	tglx


Index: linux-2.6.18-mm3/arch/i386/kernel/apic.c
===================================================================
--- linux-2.6.18-mm3.orig/arch/i386/kernel/apic.c	2006-10-04 13:02:35.000000000 +0200
+++ linux-2.6.18-mm3/arch/i386/kernel/apic.c	2006-10-04 12:59:06.000000000 +0200
@@ -84,7 +84,9 @@ static void lapic_timer_setup(enum clock
 static struct clock_event_device lapic_clockevent = {
 	.name = "lapic",
 	.capabilities = CLOCK_CAP_NEXTEVT | CLOCK_CAP_PROFILE
+#ifdef CONFIG_SMP
 			| CLOCK_CAP_UPDATE,
+#endif
 	.shift = 32,
 	.set_mode = lapic_timer_setup,
 	.set_next_event = lapic_next_event,




-
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/