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s390: use SPARSE_IRQ

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Use dynamically allocated irq descriptors on s390 which allows
us to get rid of the s390 specific config option PCI_NR_MSI and
exploit more MSI interrupts. Also the size of the kernel image
is reduced by 131K (using performance_defconfig).

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott
2016-06-02 14:57:17 +02:00
committed by Martin Schwidefsky
parent 1b8b9c81a9
commit bb98f396f1
3 changed files with 7 additions and 18 deletions
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7
arch/s390/kernel/irq.c
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@@ -127,9 +127,7 @@ int show_interrupts(struct seq_file *p, void *v)
seq_printf(p, "CPU%d ", cpu);
seq_putc(p, '\n');
}
if (index < NR_IRQS) {
if (index >= NR_IRQS_BASE)
goto out;
if (index < NR_IRQS_BASE) {
seq_printf(p, "%s: ", irqclass_main_desc[index].name);
irq = irqclass_main_desc[index].irq;
for_each_online_cpu(cpu)
@@ -137,6 +135,9 @@ int show_interrupts(struct seq_file *p, void *v)
seq_putc(p, '\n');
goto out;
}
if (index > NR_IRQS_BASE)
goto out;
for (index = 0; index < NR_ARCH_IRQS; index++) {
seq_printf(p, "%s: ", irqclass_sub_desc[index].name);
irq = irqclass_sub_desc[index].irq;