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Message-ID: <20080815093546.GA9312@elte.hu>
Date: Fri, 15 Aug 2008 11:35:46 +0200
From: Ingo Molnar <mingo@...e.hu>
To: Yinghai Lu <yhlu.kernel@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org,
Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 00/07] dyn_array/nr_irqs/sparse_irq support v10 - fix
btw., one new thing i got in testing due to irq/sparseirq is this new
lockdep splat:
[ 0.000000] Initializing CPU#0
[ 0.000000] found new irq_desc for irq 0
[ 0.000000] INFO: trying to register non-static key.
[ 0.000000] the code is fine but needs lockdep annotation.
[ 0.000000] turning off the locking correctness validator.
[ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.27-rc3-tip-00191-g98ccb89-dirty #1
[ 0.000000] [<c0153c22>] register_lock_class+0x3d2/0x400
[ 0.000000] [<c0104d87>] ? mcount_call+0x5/0xa
[ 0.000000] [<c0154f3a>] __lock_acquire+0x22a/0x5d0
[ 0.000000] [<c0104d87>] ? mcount_call+0x5/0xa
[ 0.000000] [<c0155351>] lock_acquire+0x71/0xa0
[ 0.000000] [<c016d61f>] ? set_irq_chip+0x3f/0x90
[ 0.000000] [<c070f148>] _spin_lock_irqsave+0x58/0x90
[ 0.000000] [<c016d61f>] ? set_irq_chip+0x3f/0x90
[ 0.000000] [<c016d61f>] set_irq_chip+0x3f/0x90
[ 0.000000] [<c016d7e0>] ? handle_level_irq+0x0/0xe0
[ 0.000000] [<c016da1a>] set_irq_chip_and_handler_name+0x1a/0x40
[ 0.000000] [<c0a396c1>] init_ISA_irqs+0x51/0xa0
[ 0.000000] [<c0a4a365>] pre_intr_init_hook+0x25/0x30
[ 0.000000] [<c0a39723>] native_init_IRQ+0x13/0x370
[ 0.000000] [<c015569c>] ? lock_release+0xcc/0x1d0
[ 0.000000] [<c0104d87>] ? mcount_call+0x5/0xa
[ 0.000000] [<c070dc22>] ? __mutex_unlock_slowpath+0x92/0x110
[ 0.000000] [<c070dcad>] ? mutex_unlock+0xd/0x10
[ 0.000000] [<c0135f62>] ? cpu_maps_update_done+0x12/0x20
[ 0.000000] [<c06c6743>] ? register_cpu_notifier+0x23/0x30
[ 0.000000] [<c011e8ae>] init_IRQ+0xe/0x10
[ 0.000000] [<c0a357a5>] start_kernel+0x1c5/0x340
[ 0.000000] [<c0a35280>] ? unknown_bootoption+0x0/0x210
[ 0.000000] [<c0a3506b>] i386_start_kernel+0x6b/0x80
[ 0.000000] =======================
[ 0.000000] found new irq_desc for irq 1
[ 0.000000] found new irq_desc for irq 2
[ 0.000000] found new irq_desc for irq 3
this:
static void init_one_irq_desc(struct irq_desc *desc)
{
memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
#ifdef CONFIG_TRACE_IRQFLAGS
lockdep_set_class(&desc->lock, &irq_desc_lock_class);
#endif
}
looks wrong - it should be unconditional (i've done that via the patch
below). I dont remember why we made early_init_irq_lock_class()
dependent on CONFIG_TRACE_IRQFLAGS before. Peter, do you have any
memories?
Ingo
--------------------------->
>From bba3b43f2383c2fd06c4befee45ef30d5cf59d32 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@...e.hu>
Date: Fri, 15 Aug 2008 11:34:35 +0200
Subject: [PATCH] sparseirq: fix lockdep
-tip testing found this lockdep splat:
[ 0.000000] Initializing CPU#0
[ 0.000000] found new irq_desc for irq 0
[ 0.000000] INFO: trying to register non-static key.
[ 0.000000] the code is fine but needs lockdep annotation.
[ 0.000000] turning off the locking correctness validator.
[ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.27-rc3-tip-00191-g98ccb89-dirty #1
[ 0.000000] [<c0153c22>] register_lock_class+0x3d2/0x400
[ 0.000000] [<c0104d87>] ? mcount_call+0x5/0xa
[ 0.000000] [<c0154f3a>] __lock_acquire+0x22a/0x5d0
[ 0.000000] [<c0104d87>] ? mcount_call+0x5/0xa
[ 0.000000] [<c0155351>] lock_acquire+0x71/0xa0
[ 0.000000] [<c016d61f>] ? set_irq_chip+0x3f/0x90
[ 0.000000] [<c070f148>] _spin_lock_irqsave+0x58/0x90
[ 0.000000] [<c016d61f>] ? set_irq_chip+0x3f/0x90
[ 0.000000] [<c016d61f>] set_irq_chip+0x3f/0x90
[ 0.000000] [<c016d7e0>] ? handle_level_irq+0x0/0xe0
[ 0.000000] [<c016da1a>] set_irq_chip_and_handler_name+0x1a/0x40
[ 0.000000] [<c0a396c1>] init_ISA_irqs+0x51/0xa0
[ 0.000000] [<c0a4a365>] pre_intr_init_hook+0x25/0x30
[ 0.000000] [<c0a39723>] native_init_IRQ+0x13/0x370
[ 0.000000] [<c015569c>] ? lock_release+0xcc/0x1d0
[ 0.000000] [<c0104d87>] ? mcount_call+0x5/0xa
[ 0.000000] [<c070dc22>] ? __mutex_unlock_slowpath+0x92/0x110
[ 0.000000] [<c070dcad>] ? mutex_unlock+0xd/0x10
[ 0.000000] [<c0135f62>] ? cpu_maps_update_done+0x12/0x20
[ 0.000000] [<c06c6743>] ? register_cpu_notifier+0x23/0x30
[ 0.000000] [<c011e8ae>] init_IRQ+0xe/0x10
[ 0.000000] [<c0a357a5>] start_kernel+0x1c5/0x340
[ 0.000000] [<c0a35280>] ? unknown_bootoption+0x0/0x210
[ 0.000000] [<c0a3506b>] i386_start_kernel+0x6b/0x80
[ 0.000000] =======================
[ 0.000000] found new irq_desc for irq 1
[ 0.000000] found new irq_desc for irq 2
[ 0.000000] found new irq_desc for irq 3
this:
static void init_one_irq_desc(struct irq_desc *desc)
{
memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
#ifdef CONFIG_TRACE_IRQFLAGS
lockdep_set_class(&desc->lock, &irq_desc_lock_class);
#endif
}
should be unconditional.
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
kernel/irq/handle.c | 2 --
1 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index ce8774b..8cd0c68 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -75,9 +75,7 @@ static struct irq_desc irq_desc_init = {
static void init_one_irq_desc(struct irq_desc *desc)
{
memcpy(desc, &irq_desc_init, sizeof(struct irq_desc));
-#ifdef CONFIG_TRACE_IRQFLAGS
lockdep_set_class(&desc->lock, &irq_desc_lock_class);
-#endif
}
extern int after_bootmem;
--
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