From b21ddbf50386d10cdd60d8f8e744cff0496d2552 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Mon, 7 Jun 2010 16:28:49 -0400 Subject: [PATCH] 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 . [Impact: reduce memory usage ] [v2: Conflict in drivers/xen/events.c: Replaced alloc_bootmen with kcalloc ] Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Konrad Rzeszutek Wilk --- drivers/xen/events.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) 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 #include #include +#include #include #include @@ -97,11 +98,9 @@ struct irq_info }; #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 @@ static int find_irq_by_gsi(unsigned gsi) { 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 @@ void __init xen_init_IRQ(void) 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(); -- 2.7.4