diff options
| author | Yinghai Lu <yhlu.kernel@gmail.com> | 2008-08-20 05:50:10 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-16 16:52:32 +0200 |
| commit | 9059d8fa4a3a9153da53da890039f7f956cc9d19 (patch) | |
| tree | 142f12d7843a4000eb9be7dd8a4a933ce2955f72 /kernel/irq | |
| parent | x86: move kstat_irqs from kstat to irq_desc (diff) | |
| download | linux-9059d8fa4a3a9153da53da890039f7f956cc9d19.tar.xz linux-9059d8fa4a3a9153da53da890039f7f956cc9d19.zip | |
irq: add irq_desc_without_new
add an irq_desc accessor that will not allocate any sparse entry
but returns failure if there's no entry present.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/handle.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index 1f346990f3f8..8e55dbe50afc 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -112,7 +112,6 @@ static void init_kstat_irqs(struct irq_desc *desc, int nr_desc, int nr) } } - static void __init init_work(void *data) { struct dyn_array *da = data; @@ -149,9 +148,27 @@ static int __init parse_nr_irq_desc(char *arg) early_param("nr_irq_desc", parse_nr_irq_desc); -static struct irq_desc *sparse_irqs; +struct irq_desc *sparse_irqs; DEFINE_DYN_ARRAY(sparse_irqs, sizeof(struct irq_desc), nr_irq_desc, PAGE_SIZE, init_work); +struct irq_desc *__irq_to_desc(unsigned int irq) +{ + struct irq_desc *desc; + + BUG_ON(irq == -1U); + + desc = &sparse_irqs[0]; + while (desc) { + if (desc->irq == irq) + return desc; + + if (desc->irq == -1U) + return NULL; + + desc = desc->next; + } + return NULL; +} struct irq_desc *irq_to_desc(unsigned int irq) { struct irq_desc *desc, *desc_pri; @@ -208,8 +225,7 @@ struct irq_desc *irq_to_desc(unsigned int irq) return desc; } #else - -static struct irq_desc *irq_desc; +struct irq_desc *irq_desc; DEFINE_DYN_ARRAY(irq_desc, sizeof(struct irq_desc), nr_irqs, PAGE_SIZE, init_work); #endif @@ -239,6 +255,10 @@ struct irq_desc *irq_to_desc(unsigned int irq) return NULL; } +struct irq_desc *__irq_to_desc(unsigned int irq) +{ + return irq_to_desc(irq); +} #endif /* |