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The majority of SMP platforms handle their IPIs through do_IRQ()
which calls irq_{enter/exit}(). When a call function IPI is received,
smp_call_function_interrupt() is called which also calls
irq_{enter,exit}(), meaning irq_count is raised twice.
When tick broadcasting is used (which is implemented via a call
function IPI), this incorrectly causes all CPU idle time on the core
receiving broadcast ticks to be accounted as time spent servicing
IRQs, as account_process_tick() will account as such if irq_count is
greater than 1. This results in 100% CPU usage being reported on a
core which receives its ticks via broadcast.
This patch removes the SMP smp_call_function_interrupt() wrapper which
calls irq_{enter,exit}(). Platforms which handle their IPIs through
do_IRQ() now call generic_smp_call_function_interrupt() directly to
avoid incrementing irq_count a second time. Platforms which don't
(loongson, sgi-ip27, sibyte) call generic_smp_call_function_interrupt()
wrapped in irq_{enter,exit}().
Signed-off-by: Alex Smith <alex.smith@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10770/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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|---|---|---|
| .. | ||
| exynos-combiner.c | ||
| irq-armada-370-xp.c | ||
| irq-atmel-aic5.c | ||
| irq-atmel-aic-common.c | ||
| irq-atmel-aic-common.h | ||
| irq-atmel-aic.c | ||
| irq-bcm2835.c | ||
| irq-bcm7038-l1.c | ||
| irq-bcm7120-l2.c | ||
| irq-brcmstb-l2.c | ||
| irq-clps711x.c | ||
| irq-crossbar.c | ||
| irq-digicolor.c | ||
| irq-dw-apb-ictl.c | ||
| irq-gic-common.c | ||
| irq-gic-common.h | ||
| irq-gic-v2m.c | ||
| irq-gic-v3-its.c | ||
| irq-gic-v3.c | ||
| irq-gic.c | ||
| irq-hip04.c | ||
| irq-imgpdc.c | ||
| irq-ingenic.c | ||
| irq-keystone.c | ||
| irq-metag-ext.c | ||
| irq-metag.c | ||
| irq-mips-cpu.c | ||
| irq-mips-gic.c | ||
| irq-mmp.c | ||
| irq-moxart.c | ||
| irq-mtk-sysirq.c | ||
| irq-mxs.c | ||
| irq-nvic.c | ||
| irq-omap-intc.c | ||
| irq-or1k-pic.c | ||
| irq-orion.c | ||
| irq-renesas-h8s.c | ||
| irq-renesas-h8300h.c | ||
| irq-renesas-intc-irqpin.c | ||
| irq-renesas-irqc.c | ||
| irq-s3c24xx.c | ||
| irq-sa11x0.c | ||
| irq-sirfsoc.c | ||
| irq-st.c | ||
| irq-sun4i.c | ||
| irq-sunxi-nmi.c | ||
| irq-tb10x.c | ||
| irq-tegra.c | ||
| irq-versatile-fpga.c | ||
| irq-vf610-mscm-ir.c | ||
| irq-vic.c | ||
| irq-vt8500.c | ||
| irq-xtensa-mx.c | ||
| irq-xtensa-pic.c | ||
| irq-zevio.c | ||
| irqchip.c | ||
| irqchip.h | ||
| Kconfig | ||
| Makefile | ||
| spear-shirq.c | ||