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Diffstat (limited to 'arch/s390/kernel/s390_ext.c')
-rw-r--r--arch/s390/kernel/s390_ext.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/arch/s390/kernel/s390_ext.c b/arch/s390/kernel/s390_ext.c
index 3bdd38ec71d..207bc511a6e 100644
--- a/arch/s390/kernel/s390_ext.c
+++ b/arch/s390/kernel/s390_ext.c
@@ -19,7 +19,6 @@
#include <asm/irq.h>
/*
- * Simple hash strategy: index = code & 0xff;
* ext_int_hash[index] is the start of the list for all external interrupts
* that hash to this index. With the current set of external interrupts
* (0x1202 external call, 0x1004 cpu timer, 0x2401 hwc console, 0x4000
@@ -27,6 +26,11 @@
*/
ext_int_info_t *ext_int_hash[256] = { 0, };
+static inline int ext_hash(__u16 code)
+{
+ return (code + (code >> 9)) & 0xff;
+}
+
int register_external_interrupt(__u16 code, ext_int_handler_t handler)
{
ext_int_info_t *p;
@@ -37,7 +41,7 @@ int register_external_interrupt(__u16 code, ext_int_handler_t handler)
return -ENOMEM;
p->code = code;
p->handler = handler;
- index = code & 0xff;
+ index = ext_hash(code);
p->next = ext_int_hash[index];
ext_int_hash[index] = p;
return 0;
@@ -52,7 +56,7 @@ int register_early_external_interrupt(__u16 code, ext_int_handler_t handler,
return -EINVAL;
p->code = code;
p->handler = handler;
- index = code & 0xff;
+ index = ext_hash(code);
p->next = ext_int_hash[index];
ext_int_hash[index] = p;
return 0;
@@ -63,7 +67,7 @@ int unregister_external_interrupt(__u16 code, ext_int_handler_t handler)
ext_int_info_t *p, *q;
int index;
- index = code & 0xff;
+ index = ext_hash(code);
q = NULL;
p = ext_int_hash[index];
while (p != NULL) {
@@ -90,7 +94,7 @@ int unregister_early_external_interrupt(__u16 code, ext_int_handler_t handler,
if (p == NULL || p->code != code || p->handler != handler)
return -EINVAL;
- index = code & 0xff;
+ index = ext_hash(code);
q = ext_int_hash[index];
if (p != q) {
while (q != NULL) {
@@ -120,7 +124,7 @@ void do_extint(struct pt_regs *regs, unsigned short code)
*/
account_ticks(regs);
kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++;
- index = code & 0xff;
+ index = ext_hash(code);
for (p = ext_int_hash[index]; p; p = p->next) {
if (likely(p->code == code)) {
if (likely(p->handler))