diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2011-02-10 15:14:20 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-02-19 12:58:24 +0100 |
| commit | 781295762defc709a609efc01d8bb065276cd9a2 (patch) | |
| tree | 21f035b5f92571c8c3559b5e94eb0e1aa4113a36 /kernel/irq | |
| parent | 3836ca08aad4575c120ccf328652f3873eea9063 (diff) | |
| download | lwn-781295762defc709a609efc01d8bb065276cd9a2.tar.gz lwn-781295762defc709a609efc01d8bb065276cd9a2.zip | |
genirq: Add preflow handler support
sparc64 needs to call a preflow handler on certain interrupts befor
calling the action chain. Integrate it into handle_fasteoi_irq. Must
be enabled via CONFIG_IRQ_FASTEOI_PREFLOW. No impact when disabled.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/Kconfig | 3 | ||||
| -rw-r--r-- | kernel/irq/chip.c | 11 |
2 files changed, 14 insertions, 0 deletions
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index 48ad25f5fa59..9149be729e45 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -35,6 +35,9 @@ config AUTO_IRQ_AFFINITY config HARDIRQS_SW_RESEND def_bool n +config IRQ_PREFLOW_FASTEOI + def_bool n + config SPARSE_IRQ bool "Support sparse irq numbering" depends on HAVE_SPARSE_IRQ diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 2a36038b8f59..08be5d182be3 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -471,6 +471,16 @@ out_unlock: } EXPORT_SYMBOL_GPL(handle_level_irq); +#ifdef CONFIG_IRQ_PREFLOW_FASTEOI +static inline void preflow_handler(struct irq_desc *desc) +{ + if (desc->preflow_handler) + desc->preflow_handler(&desc->irq_data); +} +#else +static inline void preflow_handler(struct irq_desc *desc) { } +#endif + /** * handle_fasteoi_irq - irq handler for transparent controllers * @irq: the interrupt number @@ -503,6 +513,7 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc) mask_irq(desc); goto out; } + preflow_handler(desc); handle_irq_event(desc); out: desc->irq_data.chip->irq_eoi(&desc->irq_data); |