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| author | Vineet Gupta <vgupta@synopsys.com> | 2016-10-01 01:13:28 +0200 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2016-12-14 18:23:46 +0100 |
| commit | 107177b14d8179f864315fc4daed9da777ed30c2 (patch) | |
| tree | bf549522914db856961b39e9e12e3fc8654db3d9 /arch/arc/include/asm/irqflags-arcv2.h | |
| parent | ARCv2: entry: document intr disable in hard isr (diff) | |
| download | linux-107177b14d8179f864315fc4daed9da777ed30c2.tar.xz linux-107177b14d8179f864315fc4daed9da777ed30c2.zip | |
ARCv2: intc: default all interrupts to priority 1
ARC HS Cores support configurable multiple interrupt priorities of upto
16 levels. In commit dec2b2849cfcc ("ARCv2: intc: Allow interruption by
lowest priority interrupt") we switched to 15 which seems a bit
excessive given that there would be rare hardware implementing so many
preemption levels AND running Linux. It would seem that 2 levels will be
more common so switch to 1 as the default priority level. This will be
the "lower" priority level saving 0 for implementing NMI style support.
This scheme also works in systems with more than 2 prioity levels as
well.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/include/asm/irqflags-arcv2.h')
| -rw-r--r-- | arch/arc/include/asm/irqflags-arcv2.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arc/include/asm/irqflags-arcv2.h b/arch/arc/include/asm/irqflags-arcv2.h index e880dfa3fcd3..a64c447b0337 100644 --- a/arch/arc/include/asm/irqflags-arcv2.h +++ b/arch/arc/include/asm/irqflags-arcv2.h @@ -38,10 +38,10 @@ #define AUX_IRQ_ACT_BIT_U 31 /* - * User space should be interruptable even by lowest prio interrupt - * Safe even if actual interrupt priorities is fewer or even one + * Hardware supports 16 priorities (0 highest, 15 lowest) + * Linux by default runs at 1, priority 0 reserved for NMI style interrupts */ -#define ARCV2_IRQ_DEF_PRIO 15 +#define ARCV2_IRQ_DEF_PRIO 1 /* seed value for status register */ #define ISA_INIT_STATUS_BITS (STATUS_IE_MASK | STATUS_AD_MASK | \ |