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| author | Anton Ivanov <aivanov@brocade.com> | 2015-12-21 11:28:03 +0000 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2016-01-10 21:49:48 +0100 |
| commit | 470a166e8c5a4da4be88545b1c4dde308abac5b2 (patch) | |
| tree | e6eb78cbbfda987926215ac9ec70e730afb5f410 /arch | |
| parent | d5e3f5cbe5cee7fe6da26566559a978547179b37 (diff) | |
| download | linux-470a166e8c5a4da4be88545b1c4dde308abac5b2.tar.gz | |
um: Do not change hard IRQ flags in soft IRQ processing
Software IRQ processing in generic architectures assumes that the exit out of hard IRQ may have re-enabled interrupts (some architectures may have an implicit EOI). It presumes them enabled and toggles the flags once more just in case unless this is turned off in the architecture specific hardirq.h by setting __ARCH_IRQ_EXIT_IRQS_DISABLED This patch adds this to UML where due to the way IRQs are handled it is an optimization (it works fine without it too). Signed-off-by: Anton Ivanov <aivanov@brocade.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/um/include/asm/hardirq.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/um/include/asm/hardirq.h b/arch/um/include/asm/hardirq.h new file mode 100644 index 000000000000..756f0778e327 --- /dev/null +++ b/arch/um/include/asm/hardirq.h @@ -0,0 +1,23 @@ +#ifndef __ASM_UM_HARDIRQ_H +#define __ASM_UM_HARDIRQ_H + +#include <linux/cache.h> +#include <linux/threads.h> + +typedef struct { + unsigned int __softirq_pending; +} ____cacheline_aligned irq_cpustat_t; + +#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */ +#include <linux/irq.h> + +#ifndef ack_bad_irq +static inline void ack_bad_irq(unsigned int irq) +{ + printk(KERN_CRIT "unexpected IRQ trap at vector %02x\n", irq); +} +#endif + +#define __ARCH_IRQ_EXIT_IRQS_DISABLED 1 + +#endif /* __ASM_UM_HARDIRQ_H */ |