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    SubjectRe: [ANNOUNCE] 3.0-rt3
    On Mon, Jul 25, 2011 at 08:12:09PM -0700, Frank Rowand wrote:
    > On 07/24/11 03:33, Thomas Gleixner wrote:
    > > Dear RT Folks,
    > >
    > > I'm pleased to announce the 3.0-rt3 release.
    >
    > ARM panda board boots for PREEMPT_RT_FULL, with a BUG:
    >
    > Freeing init memory: 308K
    > BUG: sleeping function called from invalid context at kernel/rtmutex.c:645
    > in_atomic(): 1, irqs_disabled(): 128, pid: 0, name: swapper
    > 1 lock held by swapper/0:
    > #0: (&irq_desc_lock_class){-.....}, at: [<c00ed470>] handle_fasteoi_irq+0x14/0x10c
    > irq event stamp: 21292
    > hardirqs last enabled at (21291): [<c0061ee0>] default_idle+0x2c/0x3c
    > hardirqs last disabled at (21292): [<c0484bb4>] __irq_svc+0x34/0x138
    > softirqs last enabled at (0): [< (null)>] (null)
    > softirqs last disabled at (0): [< (null)>] (null)
    > [<c00681b8>] (unwind_backtrace+0x0/0xf0) from [<c0483d20>] (rt_spin_lock+0x24/0x5c)
    > [<c0483d20>] (rt_spin_lock+0x24/0x5c) from [<c006df74>] (gic_mask_irq+0x28/0x7c)
    > [<c006df74>] (gic_mask_irq+0x28/0x7c) from [<c00ece20>] (mask_irq+0x1c/0x2c)
    > [<c00ece20>] (mask_irq+0x1c/0x2c) from [<c00ed514>] (handle_fasteoi_irq+0xb8/0x10c)
    > [<c00ed514>] (handle_fasteoi_irq+0xb8/0x10c) from [<c00ea724>] (generic_handle_irq+0x34/0x50)
    > [<c00ea724>] (generic_handle_irq+0x34/0x50) from [<c0055048>] (asm_do_IRQ+0x48/0xa8)
    > [<c0055048>] (asm_do_IRQ+0x48/0xa8) from [<c0484bd0>] (__irq_svc+0x50/0x138)
    I guess you need something like the patch below.

    Best regards
    Uwe

    diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
    index 4ddd0a6..5c1dd07 100644
    --- a/arch/arm/common/gic.c
    +++ b/arch/arm/common/gic.c
    @@ -33,7 +33,7 @@
    #include <asm/mach/irq.h>
    #include <asm/hardware/gic.h>

    -static DEFINE_SPINLOCK(irq_controller_lock);
    +static DEFINE_RAW_SPINLOCK(irq_controller_lock);

    /* Address of GIC 0 CPU interface */
    void __iomem *gic_cpu_base_addr __read_mostly;
    @@ -88,30 +88,30 @@ static void gic_mask_irq(struct irq_data *d)
    {
    u32 mask = 1 << (d->irq % 32);

    - spin_lock(&irq_controller_lock);
    + raw_spin_lock(&irq_controller_lock);
    writel_relaxed(mask, gic_dist_base(d) + GIC_DIST_ENABLE_CLEAR + (gic_irq(d) / 32) * 4);
    if (gic_arch_extn.irq_mask)
    gic_arch_extn.irq_mask(d);
    - spin_unlock(&irq_controller_lock);
    + raw_spin_unlock(&irq_controller_lock);
    }

    static void gic_unmask_irq(struct irq_data *d)
    {
    u32 mask = 1 << (d->irq % 32);

    - spin_lock(&irq_controller_lock);
    + raw_spin_lock(&irq_controller_lock);
    if (gic_arch_extn.irq_unmask)
    gic_arch_extn.irq_unmask(d);
    writel_relaxed(mask, gic_dist_base(d) + GIC_DIST_ENABLE_SET + (gic_irq(d) / 32) * 4);
    - spin_unlock(&irq_controller_lock);
    + raw_spin_unlock(&irq_controller_lock);
    }

    static void gic_eoi_irq(struct irq_data *d)
    {
    if (gic_arch_extn.irq_eoi) {
    - spin_lock(&irq_controller_lock);
    + raw_spin_lock(&irq_controller_lock);
    gic_arch_extn.irq_eoi(d);
    - spin_unlock(&irq_controller_lock);
    + raw_spin_unlock(&irq_controller_lock);
    }

    writel_relaxed(gic_irq(d), gic_cpu_base(d) + GIC_CPU_EOI);
    @@ -135,7 +135,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
    if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
    return -EINVAL;

    - spin_lock(&irq_controller_lock);
    + raw_spin_lock(&irq_controller_lock);

    if (gic_arch_extn.irq_set_type)
    gic_arch_extn.irq_set_type(d, type);
    @@ -160,7 +160,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
    if (enabled)
    writel_relaxed(enablemask, base + GIC_DIST_ENABLE_SET + enableoff);

    - spin_unlock(&irq_controller_lock);
    + raw_spin_unlock(&irq_controller_lock);

    return 0;
    }
    @@ -188,11 +188,11 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
    mask = 0xff << shift;
    bit = 1 << (cpu + shift);

    - spin_lock(&irq_controller_lock);
    + raw_spin_lock(&irq_controller_lock);
    d->node = cpu;
    val = readl_relaxed(reg) & ~mask;
    writel_relaxed(val | bit, reg);
    - spin_unlock(&irq_controller_lock);
    + raw_spin_unlock(&irq_controller_lock);

    return 0;
    }
    @@ -222,9 +222,9 @@ static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)

    chained_irq_enter(chip, desc);

    - spin_lock(&irq_controller_lock);
    + raw_spin_lock(&irq_controller_lock);
    status = readl_relaxed(chip_data->cpu_base + GIC_CPU_INTACK);
    - spin_unlock(&irq_controller_lock);
    + raw_spin_unlock(&irq_controller_lock);

    gic_irq = (status & 0x3ff);
    if (gic_irq == 1023)
    --
    Pengutronix e.K. | Uwe Kleine-König |
    Industrial Linux Solutions | http://www.pengutronix.de/ |
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