s390: use SPARSE_IRQ
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>
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index a8c2590..3529a28 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -163,6 +163,7 @@
select NO_BOOTMEM
select OLD_SIGACTION
select OLD_SIGSUSPEND3
+ select SPARSE_IRQ
select SYSCTL_EXCEPTION_TRACE
select TTY
select VIRT_CPU_ACCOUNTING
@@ -605,16 +606,6 @@
This allows you to specify the maximum number of PCI functions which
this kernel will support.
-config PCI_NR_MSI
- int "Maximum number of MSI interrupts (64-32768)"
- range 64 32768
- default "256"
- help
- This defines the number of virtual interrupts the kernel will
- provide for MSI interrupts. If you configure your system to have
- too few drivers will fail to allocate MSI interrupts for all
- PCI devices.
-
source "drivers/pci/Kconfig"
endif # PCI
diff --git a/arch/s390/include/asm/irq.h b/arch/s390/include/asm/irq.h
index f97b055..70c9bce 100644
--- a/arch/s390/include/asm/irq.h
+++ b/arch/s390/include/asm/irq.h
@@ -7,11 +7,8 @@
#define NR_IRQS_BASE 3
-#ifdef CONFIG_PCI_NR_MSI
-# define NR_IRQS (NR_IRQS_BASE + CONFIG_PCI_NR_MSI)
-#else
-# define NR_IRQS NR_IRQS_BASE
-#endif
+#define NR_IRQS NR_IRQS_BASE
+#define NR_IRQS_LEGACY NR_IRQS_BASE
/* External interruption codes */
#define EXT_IRQ_INTERRUPT_KEY 0x0040
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index c373a1d..285d656 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -127,9 +127,7 @@
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 @@
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;