procinterrupts: Fix IRQ name parsing on certain arm64 SoC

[r-vignesh]

On arm64 SoCs like TI's K3 SoC and few other SoCs, IRQ names don't get parsed correct due to which they end up being classified into wrong class. Fix this by considering last token to contain IRQ name always.

Eg.: /proc/interrupt

cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 11: 7155 8882 7235 7791 GICv3 30 Level arch_timer 14: 0 0 0 0 GICv3 23 Level arm-pmu 15: 0 0 0 0 GICv3 208 Level 4b00000.spi 16: 0 0 0 0 GICv3 209 Level 4b10000.spi 116: 0 0 0 0 MSI-INTA 1716234 Level 485c0100.dma-controller chan6 134: 166 0 0 0 MSI-INTA 1970707 Level 8000000.ethernet-tx0 224: 149 0 0 0 MSI-INTA 1971731 Level 8000000.ethernet

W/o patch irqbalance -d IRQ (11) guessed as class 0 IRQ (14) guessed as class 0 IRQ (15) guessed as class 0 IRQ (16) guessed as class 0 IRQ 485c0100.dma-controller chan6(116) guessed as class 0 IRQ (134) guessed as class 0 IRQ (224) guessed as class 0

W/ this patch IRQ arch_timer(11) guessed as class 0 IRQ arm-pmu(14) guessed as class 0 IRQ 4b00000.spi(15) guessed as class 0 IRQ 4b10000.spi(16) guessed as class 0 IRQ 485c0100.dma-controller chan6(116) guessed as class 0 IRQ 8000000.ethernet-tx0(134) guessed as class 5 IRQ 8000000.ethernet(224) guessed as class 5 IRQ 8000000.ethernet(257) guessed as class 5 IRQ -davinci_gpio wl18xx(362) guessed as class

Signed-off-by: Vignesh Raghavendra vigneshr@ti.com

[nhorman]

Have you tested this on a non-soc x86_64 system? I don't want to fix one platform only to break anohter

[r-vignesh]

This issue is seen ARM 64 bit SoCs (AARCH64) and not x86_64. Code block being modified is under #ifdef AARCH64 so won't even get built for any other arch except for ARM 64 bit machines.

[r-vignesh]

Just did a sanity check on my desktop which is an x86_64. I dont see any side effects of my patch