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| author | Yuriy Kolerov <yuriy.kolerov@synopsys.com> | 2017-01-31 14:45:22 +0300 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2017-02-06 09:37:57 -0800 |
| commit | f33b8cddc8ad8ce83cd3214406bcf68ec6c4d8ec (patch) | |
| tree | bd751f96e7cf6b583a27edcb8f687d875a4c8c04 /arch/arc/Kconfig | |
| parent | fe7b10994618c846481fbcf9212d296df47bc1dc (diff) | |
| download | linux-f33b8cddc8ad8ce83cd3214406bcf68ec6c4d8ec.tar.bz2 | |
ARCv2: intc: Rework the build time irq count information
Currently Kconfig knob ARC_NUMBER_OF_INTERRUPTS is used as indicator of
hard irq count. But it is flawed that it doesn't affect
- NR_IRQS : for number of virtual interrupts
- NR_CPU_IRQS : for number of hardware interrupts
Moreover the actual hardware irq count might still not be same as
ARC_NUMBER_OF_INTERRUPTS. So use the information availble in the
Build Configuration Registers and get rid of the Kconfig option.
We still need "some" build time info about irq count to set up
sufficient number of vector table entries. This is done with a
sufficiently large NR_CPU_IRQS which will eventually be used soley for
that purpose (subsequent patches will remove its usage elsewhere)
So to summarize what this patch does:
* NR_CPU_IRQS defines a maximum number of hardware interrupts.
* Remove ARC_NUMBER_OF_INTERRUPTS option and create interrupts
table for all possible hardware interrupts.
* Increase a maximum number of virtual IRQs to 512. ARCv2 can
support 240 interrupts in the core interrupts controllers
and 128 interrupts in IDU. Thus 512 virtual IRQs must be
enough for most configurations of boards.
This patch leads to NR_CPU_IRQS in 2 places, to reduce the overall
churn. The next patch will remove the 2nd definition anyways.
Signed-off-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: reworked the changelog a bit]
Diffstat (limited to 'arch/arc/Kconfig')
| -rw-r--r-- | arch/arc/Kconfig | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 283099c9560a..ba15cb8f60fb 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -412,17 +412,6 @@ config ARC_HAS_DIV_REM bool "Insn: div, divu, rem, remu" default y -config ARC_NUMBER_OF_INTERRUPTS - int "Number of interrupts" - range 8 240 - default 32 - help - This defines the number of interrupts on the ARCv2HS core. - It affects the size of vector table. - The initial 8 IRQs are fixed (Timer, ICI etc) and although configurable - in hardware, it keep things simple for Linux to assume they are always - present. - endif # ISA_ARCV2 endmenu # "ARC CPU Configuration" |