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s390/irq: use hlists for external interrupt handler array 

Use hlists for the hashed array of external interrupt handlers.
Reduces the size of the array by 50% (2KB).

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Heiko Carstens 2013-09-03 14:12:07 +02:00
parent 8237ac3c4c
commit 50ce749d0d
1 changed files with 12 additions and 12 deletions
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24
arch/s390/kernel/irq.c
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@ -196,13 +196,13 @@ asmlinkage void do_softirq(void)
* ext_int_hash[index] is the list head for all external interrupts that hash
* to this index.
*/
static struct list_head ext_int_hash[256];
static struct hlist_head ext_int_hash[256];
struct ext_int_info {
ext_int_handler_t handler;
u16 code;
struct list_head entry;
struct hlist_node entry;
struct rcu_head rcu;
u16 code;
};
/* ext_int_hash_lock protects the handler lists for external interrupts */
@ -227,7 +227,7 @@ int register_external_interrupt(u16 code, ext_int_handler_t handler)
index = ext_hash(code);
spin_lock_irqsave(&ext_int_hash_lock, flags);
list_add_rcu(&p->entry, &ext_int_hash[index]);
hlist_add_head_rcu(&p->entry, &ext_int_hash[index]);
spin_unlock_irqrestore(&ext_int_hash_lock, flags);
return 0;
}
@ -240,9 +240,9 @@ int unregister_external_interrupt(u16 code, ext_int_handler_t handler)
int index = ext_hash(code);
spin_lock_irqsave(&ext_int_hash_lock, flags);
list_for_each_entry_rcu(p, &ext_int_hash[index], entry) {
hlist_for_each_entry_rcu(p, &ext_int_hash[index], entry) {
if (p->code == code && p->handler == handler) {
list_del_rcu(&p->entry);
hlist_del_rcu(&p->entry);
kfree_rcu(p, rcu);
}
}
@ -264,12 +264,12 @@ static irqreturn_t do_ext_interrupt(int irq, void *dummy)
index = ext_hash(ext_code.code);
rcu_read_lock();
list_for_each_entry_rcu(p, &ext_int_hash[index], entry)
if (likely(p->code == ext_code.code))
p->handler(ext_code, regs->int_parm,
regs->int_parm_long);
hlist_for_each_entry_rcu(p, &ext_int_hash[index], entry) {
if (unlikely(p->code != ext_code.code))
continue;
p->handler(ext_code, regs->int_parm, regs->int_parm_long);
}
rcu_read_unlock();
return IRQ_HANDLED;
}
@ -283,7 +283,7 @@ void __init init_ext_interrupts(void)
int idx;
for (idx = 0; idx < ARRAY_SIZE(ext_int_hash); idx++)
INIT_LIST_HEAD(&ext_int_hash[idx]);
INIT_HLIST_HEAD(&ext_int_hash[idx]);
irq_set_chip_and_handler(EXT_INTERRUPT,
&dummy_irq_chip, handle_percpu_irq);