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OpenCloudOS-Kernel
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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>
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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11
arch/s390/Kconfig
View File

@ -163,6 +163,7 @@ config S390
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 @@ config PCI_NR_FUNCTIONS
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

7
arch/s390/include/asm/irq.h
View File

@ -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

7
arch/s390/kernel/irq.c
View File

@ -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;