Re: [patch 02/30] genirq: Move status flag checks to core

[Thomas Gleixner]

On Sun, Dec 27 2020 at 11:20, Guenter Roeck wrote:
> On Thu, Dec 10, 2020 at 08:25:38PM +0100, Thomas Gleixner wrote:
> Yes, but that means that irq_check_status_bit() may be called from modules,
> but it is not exported, resulting in build errors such as the following.
>
> arm64:allmodconfig:
>
> ERROR: modpost: "irq_check_status_bit" [drivers/perf/arm_spe_pmu.ko] 
> undefined!

Duh. Yes, that lacks an export obviously.

Thanks,

tglx
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Re: [patch 02/30] genirq: Move status flag checks to core

[Guenter Roeck]

On Thu, Dec 10, 2020 at 08:25:38PM +0100, Thomas Gleixner wrote:
> These checks are used by modules and prevent the removal of the export of
> irq_to_desc(). Move the accessor into the core.
> 
> Signed-off-by: Thomas Gleixner 

Yes, but that means that irq_check_status_bit() may be called from modules,
but it is not exported, resulting in build errors such as the following.

arm64:allmodconfig:

ERROR: modpost: "irq_check_status_bit" [drivers/perf/arm_spe_pmu.ko] undefined!

Guenter

> ---
>  include/linux/irqdesc.h |   17 +
>  kernel/irq/manage.c |   17 +
>  2 files changed, 22 insertions(+), 12 deletions(-)
> 
> --- a/include/linux/irqdesc.h
> +++ b/include/linux/irqdesc.h
> @@ -223,28 +223,21 @@ irq_set_chip_handler_name_locked(struct
>   data->chip = chip;
>  }
>  
> +bool irq_check_status_bit(unsigned int irq, unsigned int bitmask);
> +
>  static inline bool irq_balancing_disabled(unsigned int irq)
>  {
> - struct irq_desc *desc;
> -
> - desc = irq_to_desc(irq);
> - return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
> + return irq_check_status_bit(irq, IRQ_NO_BALANCING_MASK);
>  }
>  
>  static inline bool irq_is_percpu(unsigned int irq)
>  {
> - struct irq_desc *desc;
> -
> - desc = irq_to_desc(irq);
> - return desc->status_use_accessors & IRQ_PER_CPU;
> + return irq_check_status_bit(irq, IRQ_PER_CPU);
>  }
>  
>  static inline bool irq_is_percpu_devid(unsigned int irq)
>  {
> - struct irq_desc *desc;
> -
> - desc = irq_to_desc(irq);
> - return desc->status_use_accessors & IRQ_PER_CPU_DEVID;
> + return irq_check_status_bit(irq, IRQ_PER_CPU_DEVID);
>  }
>  
>  static inline void
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -2769,3 +2769,23 @@ bool irq_has_action(unsigned int irq)
>   return res;
>  }
>  EXPORT_SYMBOL_GPL(irq_has_action);
> +
> +/**
> + * irq_check_status_bit - Check whether bits in the irq descriptor status 
> are set
> + * @irq: The linux irq number
> + * @bitmask: The bitmask to evaluate
> + *
> + * Returns: True if one of the bits in @bitmask is set
> + */
> +bool irq_check_status_bit(unsigned int irq, unsigned int bitmask)
> +{
> + struct irq_desc *desc;
> + bool res = false;
> +
> + rcu_read_lock();
> + desc = irq_to_desc(irq);
> + if (desc)
> + res = !!(desc->status_use_accessors & bitmask);
> + rcu_read_unlock();
> + return res;
> +}
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[patch 02/30] genirq: Move status flag checks to core

[Thomas Gleixner]

These checks are used by modules and prevent the removal of the export of
irq_to_desc(). Move the accessor into the core.

Signed-off-by: Thomas Gleixner 
---
 include/linux/irqdesc.h |   17 +
 kernel/irq/manage.c |   17 +
 2 files changed, 22 insertions(+), 12 deletions(-)

--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -223,28 +223,21 @@ irq_set_chip_handler_name_locked(struct
data->chip = chip;
 }
 
+bool irq_check_status_bit(unsigned int irq, unsigned int bitmask);
+
 static inline bool irq_balancing_disabled(unsigned int irq)
 {
-   struct irq_desc *desc;
-
-   desc = irq_to_desc(irq);
-   return desc->status_use_accessors & IRQ_NO_BALANCING_MASK;
+   return irq_check_status_bit(irq, IRQ_NO_BALANCING_MASK);
 }
 
 static inline bool irq_is_percpu(unsigned int irq)
 {
-   struct irq_desc *desc;
-
-   desc = irq_to_desc(irq);
-   return desc->status_use_accessors & IRQ_PER_CPU;
+   return irq_check_status_bit(irq, IRQ_PER_CPU);
 }
 
 static inline bool irq_is_percpu_devid(unsigned int irq)
 {
-   struct irq_desc *desc;
-
-   desc = irq_to_desc(irq);
-   return desc->status_use_accessors & IRQ_PER_CPU_DEVID;
+   return irq_check_status_bit(irq, IRQ_PER_CPU_DEVID);
 }
 
 static inline void
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -2769,3 +2769,23 @@ bool irq_has_action(unsigned int irq)
return res;
 }
 EXPORT_SYMBOL_GPL(irq_has_action);
+
+/**
+ * irq_check_status_bit - Check whether bits in the irq descriptor status are 
set
+ * @irq:   The linux irq number
+ * @bitmask:   The bitmask to evaluate
+ *
+ * Returns: True if one of the bits in @bitmask is set
+ */
+bool irq_check_status_bit(unsigned int irq, unsigned int bitmask)
+{
+   struct irq_desc *desc;
+   bool res = false;
+
+   rcu_read_lock();
+   desc = irq_to_desc(irq);
+   if (desc)
+   res = !!(desc->status_use_accessors & bitmask);
+   rcu_read_unlock();
+   return res;
+}

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