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x86: put timer_rand_state pointer into irq_desc

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irq_timer_state[] is a NR_IRQS sized array that is a side-by array to
the real irq_desc[] array.

Integrate that field into the (now dynamic) irq_desc dynamic array and
save some RAM.

v2: keep the old way to support arch not support irq_desc

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-08-19 20:50:08 -07:00 committed by Ingo Molnar
parent e5a53714ac
commit 3060d6fe28
2 changed files with 63 additions and 5 deletions
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66
drivers/char/random.c
View file

@ -558,7 +558,7 @@ struct timer_rand_state {
unsigned dont_count_entropy:1;
};
static struct timer_rand_state input_timer_state;
#ifndef CONFIG_HAVE_SPARSE_IRQ
#ifdef CONFIG_HAVE_DYN_ARRAY
static struct timer_rand_state **irq_timer_state;
@ -567,6 +567,51 @@ DEFINE_DYN_ARRAY(irq_timer_state, sizeof(struct timer_rand_state *), nr_irqs, PA
static struct timer_rand_state *irq_timer_state[NR_IRQS];
#endif
static struct timer_rand_state *get_timer_rand_state(unsigned int irq)
{
if (irq >= nr_irqs)
return NULL;
return irq_timer_state[irq];
}
static void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state)
{
if (irq >= nr_irqs)
return;
irq_timer_state[irq] = state;
}
#else
static struct timer_rand_state *get_timer_rand_state(unsigned int irq)
{
struct irq_desc *desc;
desc = irq_to_desc(irq);
if (!desc)
return NULL;
return desc->timer_rand_state;
}
static void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state)
{
struct irq_desc *desc;
desc = irq_to_desc(irq);
if (!desc)
return;
desc->timer_rand_state = state;
}
#endif
static struct timer_rand_state input_timer_state;
/*
* This function adds entropy to the entropy "pool" by using timing
* delays. It uses the timer_rand_state structure to make an estimate
@ -654,11 +699,15 @@ EXPORT_SYMBOL_GPL(add_input_randomness);
void add_interrupt_randomness(int irq)
{
if (irq >= nr_irqs || irq_timer_state[irq] == NULL)
struct timer_rand_state *state;
state = get_timer_rand_state(irq);
if (state == NULL)
return;
DEBUG_ENT("irq event %d\n", irq);
add_timer_randomness(irq_timer_state[irq], 0x100 + irq);
add_timer_randomness(state, 0x100 + irq);
}
#ifdef CONFIG_BLOCK
@ -918,7 +967,14 @@ void rand_initialize_irq(int irq)
{
struct timer_rand_state *state;
if (irq >= nr_irqs || irq_timer_state[irq])
#ifndef CONFIG_HAVE_SPARSE_IRQ
if (irq >= nr_irqs)
return;
#endif
state = get_timer_rand_state(irq);
if (state)
return;
/*
@ -927,7 +983,7 @@ void rand_initialize_irq(int irq)
*/
state = kzalloc(sizeof(struct timer_rand_state), GFP_KERNEL);
if (state)
irq_timer_state[irq] = state;
set_timer_rand_state(irq, state);
}
#ifdef CONFIG_BLOCK

2
include/linux/irq.h
View file

@ -127,6 +127,7 @@ struct irq_chip {
const char *typename;
};
struct timer_rand_state;
/**
* struct irq_desc - interrupt descriptor
*
@ -155,6 +156,7 @@ struct irq_desc {
unsigned int irq;
#ifdef CONFIG_HAVE_SPARSE_IRQ
struct irq_desc *next;
struct timer_rand_state *timer_rand_state;
#endif
irq_flow_handler_t handle_irq;
struct irq_chip *chip;