linux-kernel - [23/89] x86/uv: Fix uninitialized spinlocks

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Date:	Wed, 01 Feb 2012 12:59:47 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Cliff Wickman <cpw@....com>,
	Dimitri Sivanich <sivanich@....com>,
	Ingo Molnar <mingo@...e.hu>
Subject: [23/89] x86/uv: Fix uninitialized spinlocks

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Cliff Wickman <cpw@....com>

commit d2ebc71d472020bc30e29afe8c4d2a85a5b41f56 upstream.

Initialize two spinlocks in tlb_uv.c and also properly define/initialize
the uv_irq_lock.

The lack of explicit initialization seems to be functionally
harmless, but it is diagnosed when these are turned on:

        CONFIG_DEBUG_SPINLOCK=y
        CONFIG_DEBUG_MUTEXES=y
        CONFIG_DEBUG_LOCK_ALLOC=y
        CONFIG_LOCKDEP=y

Signed-off-by: Cliff Wickman <cpw@....com>
Cc: Dimitri Sivanich <sivanich@....com>
Link: http://lkml.kernel.org/r/E1RnXd1-0003wU-PM@eag09.americas.sgi.com
[ Added the uv_irq_lock initialization fix by Dimitri Sivanich ]
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/platform/uv/tlb_uv.c |    2 ++
 arch/x86/platform/uv/uv_irq.c |    2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -1860,6 +1860,8 @@ static void __init init_per_cpu_tunables
 		bcp->cong_reps			= congested_reps;
 		bcp->cong_period		= congested_period;
 		bcp->clocks_per_100_usec =	usec_2_cycles(100);
+		spin_lock_init(&bcp->queue_lock);
+		spin_lock_init(&bcp->uvhub_lock);
 	}
 }
 
--- a/arch/x86/platform/uv/uv_irq.c
+++ b/arch/x86/platform/uv/uv_irq.c
@@ -25,7 +25,7 @@ struct uv_irq_2_mmr_pnode{
 	int			irq;
 };
 
-static spinlock_t		uv_irq_lock;
+static DEFINE_SPINLOCK(uv_irq_lock);
 static struct rb_root		uv_irq_root;
 
 static int uv_set_irq_affinity(struct irq_data *, const struct cpumask *, bool);


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