salinfo changes for new MCA/INIT handlers

Reading the INIT record from SAL during the INIT event has proved to be unreliable, and a source of hangs during INIT processing. The new MCA/INIT handlers remove the need to get the INIT record from SAL. Change salinfo.c so mca.c can just flag that a new record is available, without having to read the record during INIT processing. This patch can be applied without the new MCA/INIT handlers.

Also clean up some usage of NR_CPUS which should have been using cpu_online().

 salinfo.c |   62 ++++++++++++++++++++++++++++++++++----------------------------
 1 files changed, 34 insertions(+), 28 deletions(-)

Index: linux/arch/ia64/kernel/salinfo.c
=================================--- linux.orig/arch/ia64/kernel/salinfo.c 2005-08-18 17:21:51.991680310 +1000
+++ linux/arch/ia64/kernel/salinfo.c 2005-08-18 17:32:18.440243239 +1000
@@ -22,6 +22,11 @@
*
* Dec 5 2004 [email protected]
* Standardize which records are cleared automatically.
+ *
+ * Aug 18 2005 [email protected]

+ *   mca.c may not pass a buffer, a NULL buffer just indicates that a new
+ *   record is available in SAL.
+ *   Replace some NR_CPUS by cpus_online, for hotplug cpu.

*/

#include <linux/types.h>
@@ -193,7 +198,7 @@ shift1_data_saved (struct salinfo_data *
* The buffer passed from mca.c points to the output from ia64_log_get. This is
* a persistent buffer but its contents can change between the interrupt and
* when user space processes the record. Save the record id to identify
- * changes.
+ * changes. If the buffer is NULL then just update the bitmap.
*/
void
salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
@@ -206,27 +211,29 @@ salinfo_log_wakeup(int type, u8 *buffer,

BUG_ON(type >= ARRAY_SIZE(salinfo_log_name));

- if (irqsafe)
- spin_lock_irqsave(&data_saved_lock, flags);
- for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
- if (!data_saved->buffer)
- break;
- }
- if (i = saved_size) {
- if (!data->saved_num) {
- shift1_data_saved(data, 0);
- data_saved = data->data_saved + saved_size - 1;
- } else
- data_saved = NULL;
- }
- if (data_saved) {
- data_saved->cpu = smp_processor_id();
- data_saved->id = ((sal_log_record_header_t *)buffer)->id;
- data_saved->size = size;
- data_saved->buffer = buffer;
+ if (buffer) {
+ if (irqsafe)
+ spin_lock_irqsave(&data_saved_lock, flags);
+ for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
+ if (!data_saved->buffer)
+ break;
+ }
+ if (i = saved_size) {
+ if (!data->saved_num) {
+ shift1_data_saved(data, 0);
+ data_saved = data->data_saved + saved_size - 1;
+ } else
+ data_saved = NULL;
+ }
+ if (data_saved) {
+ data_saved->cpu = smp_processor_id();
+ data_saved->id = ((sal_log_record_header_t *)buffer)->id;
+ data_saved->size = size;
+ data_saved->buffer = buffer;
+ }
+ if (irqsafe)
+ spin_unlock_irqrestore(&data_saved_lock, flags);
}
- if (irqsafe)
- spin_unlock_irqrestore(&data_saved_lock, flags);

if (!test_and_set_bit(smp_processor_id(), &data->cpu_event)) {
if (irqsafe)
@@ -244,7 +251,7 @@ salinfo_timeout_check(struct salinfo_dat
int i;
if (!data->open)
return;
- for (i = 0; i < NR_CPUS; ++i) {
+ for_each_online_cpu(i) {
if (test_bit(i, &data->cpu_event)) {
/* double up() is not a problem, user space will see no
* records for the additional "events".
@@ -291,7 +298,7 @@ retry:

n = data->cpu_check;
for (i = 0; i < NR_CPUS; i++) {
- if (test_bit(n, &data->cpu_event)) {
+ if (test_bit(n, &data->cpu_event) && cpu_online(n)) {
cpu = n;
break;
}
@@ -585,11 +592,10 @@ salinfo_init(void)

/* we missed any events before now */ online = 0;
- for (j = 0; j < NR_CPUS; j++)
- if (cpu_online(j)) {
- set_bit(j, &data->cpu_event);
- ++online;
- }
+ for_each_online_cpu(j) {
+ set_bit(j, &data->cpu_event);
+ ++online;
+ }
sema_init(&data->sem, online);

*sdir++ = dir;