linux-kernel - Re: [GIT PULL] timers/nohz updates for 3.12

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Date:	Tue, 13 Aug 2013 16:57:30 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Mike Galbraith <efault@....de>,
	Kevin Hilman <khilman@...aro.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Alex Shi <alex.shi@...el.com>, Paul Turner <pjt@...gle.com>,
	Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [GIT PULL] timers/nohz updates for 3.12


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> > >  19 files changed, 534 insertions(+), 326 deletions(-)
> > 
> > When merged to -tip it causes this build error:
> > 
> >  kernel/time/tick-sched.c:186:3: error: 'have_nohz_full_mask' undeclared (first use in this function)
> >  kernel/time/tick-sched.c:345:2: error: 'cpu' undeclared (first use in this function)
> > 
> > config attached.
> > 
> > I did what looked like to be an obvious conflict resolution to 
> > tick-sched.c (attached), please double check that too.
> > 
> > While at it, mind rebasing your changes to tip:timers/urgent, which has a 
> > few nohz fixes pending as well?
> 
> Ok I did the rebase on top of tip:timers/urgent and handled the 
> conflicts along. The new branch is "timers/nohz-v2".
> 
> Tell me if anything goes wrong with it.

it produces this splat on bootup with the attached config, on a dual-core 
Athlon64 box:

calling  context_tracking_init+0x0/0x3a @ 1
initcall context_tracking_init+0x0/0x3a returned 0 after 0 usecs
calling  dynamic_debug_init+0x0/0x239 @ 1
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at kernel/sched/cputime.c:639 get_vtime_delta+0x49/0x5f()
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.11.0-rc5-01689-g7830cba-dirty #226899
Hardware name: System manufacturer System Product Name/A8N-E, BIOS ASUS A8N-E ACPI BIOS Revision 1008 08/22/2005
 0000000000000009 ffff88003fa03ea8 ffffffff81f83f30 0000000000000b63
 0000000000000000 ffff88003fa03ee8 ffffffff810996a4 0000000000000000
 ffffffff810bcfb5 ffff88003e33a000 0000000015752a00 0000000000000000
Call Trace:
 <IRQ>  [<ffffffff81f83f30>] dump_stack+0x46/0x58
 [<ffffffff810996a4>] warn_slowpath_common+0x72/0x8c
 [<ffffffff810bcfb5>] ? get_vtime_delta+0x49/0x5f
 [<ffffffff8109976c>] warn_slowpath_null+0x15/0x19
 [<ffffffff810bcfb5>] get_vtime_delta+0x49/0x5f
 [<ffffffff810bd213>] __vtime_account_system+0xf/0x37
 [<ffffffff810bd426>] vtime_account_system+0x21/0x2e
 [<ffffffff810bd5bf>] vtime_common_account_irq_enter+0x41/0x43
 [<ffffffff8109ce4a>] irq_enter+0x65/0x7c
 [<ffffffff810434e2>] smp_apic_timer_interrupt+0x23/0x40
 [<ffffffff81f9435d>] apic_timer_interrupt+0x6d/0x80
 <EOI>  [<ffffffff810c42d5>] ? arch_local_irq_restore+0x12/0x19
 [<ffffffff810c5acb>] vprintk_emit+0x3e2/0x40a
 [<ffffffff81099995>] ? cpu_maps_update_begin+0x12/0x14
 [<ffffffff832e9244>] ? ddebug_setup_query+0x4d/0x4d
 [<ffffffff81f80ddd>] printk+0x5c/0x5e
 [<ffffffff8135caff>] __dynamic_pr_debug+0x79/0x7b
 [<ffffffff810c764d>] ? timekeeping_get_ns.constprop.10+0x12/0x38
 [<ffffffff832db12b>] ? init_hw_breakpoint+0xf7/0xf7
 [<ffffffff810c7bbb>] ? ktime_get+0x65/0x74
 [<ffffffff832db12b>] ? init_hw_breakpoint+0xf7/0xf7
 [<ffffffff832e9244>] ? ddebug_setup_query+0x4d/0x4d
 [<ffffffff832c4d9d>] do_one_initcall+0x5b/0x12a
 [<ffffffff832d09a5>] ? native_smp_prepare_cpus+0x300/0x341
 [<ffffffff832c4ed6>] kernel_init_freeable+0x6a/0x195
 [<ffffffff81f7c075>] ? rest_init+0xb9/0xb9
 [<ffffffff81f7c07e>] kernel_init+0x9/0xd1
 [<ffffffff81f9357c>] ret_from_fork+0x7c/0xb0
 [<ffffffff81f7c075>] ? rest_init+0xb9/0xb9
---[ end trace 268f4433da36e82f ]---
initcall dynamic_debug_init+0x0/0x239 returned 0 after 0 usecs

Thanks,

	Ingo

View attachment "config" of type "text/plain" (94987 bytes)