xen: dynamically allocate irq & event structures
Dynamically allocate the irq_info and evtchn_to_irq arrays, so that
1) the irq_info array scales to the actual number of possible irqs,
and 2) we don't needlessly increase the static size of the kernel
when we aren't running under Xen.
Derived on patch from Mike Travis <travis@sgi.com>.
[Impact: reduce memory usage ]
[v2: Conflict in drivers/xen/events.c: Replaced alloc_bootmen with kcalloc ]
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 1bb51e4..19a9329 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -28,6 +28,7 @@
#include <linux/string.h>
#include <linux/bootmem.h>
#include <linux/slab.h>
+#include <linux/irqnr.h>
#include <asm/desc.h>
#include <asm/ptrace.h>
@@ -97,11 +98,9 @@
};
#define PIRQ_NEEDS_EOI (1 << 0)
-static struct irq_info irq_info[NR_IRQS];
+static struct irq_info *irq_info;
-static int evtchn_to_irq[NR_EVENT_CHANNELS] = {
- [0 ... NR_EVENT_CHANNELS-1] = -1
-};
+static int *evtchn_to_irq;
struct cpu_evtchn_s {
unsigned long bits[NR_EVENT_CHANNELS/BITS_PER_LONG];
};
@@ -527,7 +526,7 @@
{
int irq;
- for (irq = 0; irq < NR_IRQS; irq++) {
+ for (irq = 0; irq < nr_irqs; irq++) {
struct irq_info *info = info_for_irq(irq);
if (info == NULL || info->type != IRQT_PIRQ)
@@ -1267,7 +1266,12 @@
cpu_evtchn_mask_p = kcalloc(nr_cpu_ids, sizeof(struct cpu_evtchn_s),
GFP_KERNEL);
- BUG_ON(cpu_evtchn_mask_p == NULL);
+ irq_info = kcalloc(nr_irqs, sizeof(*irq_info), GFP_KERNEL);
+
+ evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
+ GFP_KERNEL);
+ for (i = 0; i < NR_EVENT_CHANNELS; i++)
+ evtchn_to_irq[i] = -1;
init_evtchn_cpu_bindings();