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generic: sparse irqs: use irq_desc() together with dyn_array, instead of irq_desc[]

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add CONFIG_HAVE_SPARSE_IRQ to for use condensed array.
Get rid of irq_desc[] array assumptions.

Preallocate 32 irq_desc, and irq_desc() will try to get more.

( No change in functionality is expected anywhere, except the odd build
  failure where we missed a code site or where a crossing commit itroduces
  new irq_desc[] usage. )

v2: according to Eric, change get_irq_desc() to irq_desc()

Signed-off-by: Yinghai Lu <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Yinghai Lu 2008-08-19 20:50:05 -07:00 • committed by Ingo Molnar
commit 08678b0841
28 changed files with 404 additions and 187 deletions
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2
drivers/gpio/gpiolib.c
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@ -1058,7 +1058,7 @@ static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip)
if (!is_out) {
int irq = gpio_to_irq(gpio);
struct irq_desc *desc = irq_desc + irq;
struct irq_desc *desc = irq_to_desc(irq);
/* This races with request_irq(), set_irq_type(),
* and set_irq_wake() ... but those are "rare".