linux-kernel - RE: [ANNOUNCE] 3.0-rt3

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Date:	Wed, 27 Jul 2011 20:32:40 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"N, Mugunthan V" <mugunthanvnm@...com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: RE: [ANNOUNCE] 3.0-rt3

On Wed, 27 Jul 2011, N, Mugunthan V wrote:

Please do not top post.

> I am testing 3.0-rt3 on AM3517 - Arm Cortex A8. As the kernel from the
> mainline is not booting I am using a patch to boot AM3517 kernel on top of
> the mainline kernel. Its crashing when I start hackbench and cyclictest.
> 
> There were two warnings while starting the test and then the kernel crashes.
> Attaching the patch and the rt-config file.
> 
> [  266.001220] BUG: sleeping function called from invalid context at
> kernel/rtmutex.c:645

That should be fixed by the patch below.

> [  267.494995] ------------[ cut here ]------------
> [  267.495086] WARNING: at kernel/lockdep.c:939 __bfs+0x1f8/0x254()

Could you please disable CONFIG_RCU_BOOST ?

Thanks,

	tglx

Index: linux-2.6/arch/arm/include/asm/mmu.h
===================================================================
--- linux-2.6.orig/arch/arm/include/asm/mmu.h
+++ linux-2.6/arch/arm/include/asm/mmu.h
@@ -6,7 +6,7 @@
 typedef struct {
 #ifdef CONFIG_CPU_HAS_ASID
 	unsigned int id;
-	spinlock_t id_lock;
+	raw_spinlock_t id_lock;
 #endif
 	unsigned int kvm_seq;
 } mm_context_t;
Index: linux-2.6/arch/arm/mm/context.c
===================================================================
--- linux-2.6.orig/arch/arm/mm/context.c
+++ linux-2.6/arch/arm/mm/context.c
@@ -31,7 +31,7 @@ DEFINE_PER_CPU(struct mm_struct *, curre
 void __init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 {
 	mm->context.id = 0;
-	spin_lock_init(&mm->context.id_lock);
+	raw_spin_lock_init(&mm->context.id_lock);
 }
 
 static void flush_context(void)
@@ -58,7 +58,7 @@ static void set_mm_context(struct mm_str
 	 * the broadcast. This function is also called via IPI so the
 	 * mm->context.id_lock has to be IRQ-safe.
 	 */
-	spin_lock_irqsave(&mm->context.id_lock, flags);
+	raw_spin_lock_irqsave(&mm->context.id_lock, flags);
 	if (likely((mm->context.id ^ cpu_last_asid) >> ASID_BITS)) {
 		/*
 		 * Old version of ASID found. Set the new one and
@@ -67,7 +67,7 @@ static void set_mm_context(struct mm_str
 		mm->context.id = asid;
 		cpumask_clear(mm_cpumask(mm));
 	}
-	spin_unlock_irqrestore(&mm->context.id_lock, flags);
+	raw_spin_unlock_irqrestore(&mm->context.id_lock, flags);
 
 	/*
 	 * Set the mm_cpumask(mm) bit for the current CPU.
--
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