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linux-sg2042/drivers/irqchip
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Alex Smith 4ace6139bf MIPS: SMP: Don't increment irq_count multiple times for call function IPIs 
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>
 		2015-08-03 09:25:12 +02:00
..
Kconfig Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2015-06-27 12:44:34 -07:00
Makefile Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2015-06-27 12:44:34 -07:00
exynos-combiner.c irqchip: exynos-combiner: Save IRQ enable set on suspend 2015-06-16 11:34:41 +02:00
irq-armada-370-xp.c irqchip: Constify irq_domain_ops 2015-05-05 10:45:58 +02:00
irq-atmel-aic-common.c irqchip: atmel-aic-common: Prevent clobbering of priority when changing IRQ type 2015-01-07 12:41:45 +00:00
irq-atmel-aic-common.h irqchip: atmel-aic: Add irq fixup for RTT block 2014-11-09 04:36:38 +00:00
irq-atmel-aic.c Merge branch 'irqchip/atmel' into irqchip/core 2014-11-26 07:02:27 +00:00
irq-atmel-aic5.c irqchip: atmel-aic5: Add sama5d2 support 2015-06-18 15:29:52 +02:00
irq-bcm2835.c irqchip: Constify irq_domain_ops 2015-05-05 10:45:58 +02:00
irq-bcm7038-l1.c IRQCHIP: Add new driver for BCM7038-style level 1 interrupt controllers 2015-04-01 17:21:37 +02:00
irq-bcm7120-l2.c IRQCHIP: bcm7120-l2: Add support for BCM3380-style controllers 2015-04-01 17:21:37 +02:00
irq-brcmstb-l2.c IRQCHIP: brcmstb-l2: don't clear wakeable interrupts at init time 2015-04-01 17:21:36 +02:00
irq-clps711x.c irqchip: clps711x: Convert to handle_domain_irq 2014-09-03 13:10:32 +00:00
irq-crossbar.c irqchip: crossbar: Convert dra7 crossbar to stacked domains 2015-03-15 00:55:24 +00:00
irq-digicolor.c irqchip: digicolor: Move digicolor_set_gc to init section 2015-03-23 10:00:52 +00:00
irq-dw-apb-ictl.c irqchip: dw-apb-ictl: Add PM support 2014-11-26 16:08:03 +00:00
irq-gic-common.c irqchip: gic: Simplify gic_configure_irq by using IRQCHIP_SET_TYPE_MASKED 2015-06-05 22:26:33 +02:00
irq-gic-common.h irqchip: gic: Allow interrupt level to be set for PPIs 2015-01-26 11:38:23 +01:00
irq-gic-v2m.c irqchip: gic-v2m: Add support for ARM GICv2m MSI(-X) doorbell 2014-11-26 15:55:18 +00:00
irq-gic-v3-its.c irqchip/gicv3-its: Fix mapping of LPIs to collections 2015-07-17 12:14:29 +02:00
irq-gic-v3.c irqchip: gic: Simplify gic_configure_irq by using IRQCHIP_SET_TYPE_MASKED 2015-06-05 22:26:33 +02:00
irq-gic.c ACPI / ARM64 : use the new BAD_MADT_GICC_ENTRY macro 2015-07-07 14:55:04 +01:00
irq-hip04.c irqchip: gic: Simplify gic_configure_irq by using IRQCHIP_SET_TYPE_MASKED 2015-06-05 22:26:33 +02:00
irq-imgpdc.c irq-imgpdc: add ImgTec PDC irqchip driver 2013-08-21 14:17:56 +01:00
irq-ingenic.c MIPS/IRQCHIP: Move Ingenic SoC intc driver to drivers/irqchip 2015-06-21 21:53:10 +02:00
irq-keystone.c irq: irq-keystone: Fix race in installing chained IRQ handler 2015-06-18 14:03:08 +02:00
irq-metag-ext.c irq-metag*: stop set_affinity vectoring to offline cpus 2014-02-25 22:35:06 +00:00
irq-metag.c irq-metag*: stop set_affinity vectoring to offline cpus 2014-02-25 22:35:06 +00:00
irq-mips-cpu.c IRQCHIP: irq_cpu: declare irqchip table entry 2015-06-21 21:52:52 +02:00
irq-mips-gic.c MIPS: SMP: Don't increment irq_count multiple times for call function IPIs 2015-08-03 09:25:12 +02:00
irq-mmp.c irqchip: mmp: Convert to handle_domain_irq 2014-09-03 13:10:34 +00:00
irq-moxart.c irqchip: Remove asmlinkage from static functions 2014-03-12 13:00:41 +01:00
irq-mtk-sysirq.c irqchip: mtk-sysirq: Make mtk_sysirq_of_init return error if ioremap fails 2015-05-22 11:06:47 +02:00
irq-mxs.c irqchip: Constify irq_domain_ops 2015-05-05 10:45:58 +02:00
irq-nvic.c irqchip: nvic: Support hierarchy irq domain 2015-05-18 17:32:44 +02:00
irq-omap-intc.c irqchip: omap-intc: Remove unused legacy interface for omap2 2015-01-26 11:38:23 +01:00
irq-or1k-pic.c irqchip: or1k-pic: Convert to handle_domain_irq 2014-09-03 13:10:54 +00:00
irq-orion.c irqchip: orion: Convert to handle_domain_irq 2014-09-03 13:10:37 +00:00
irq-renesas-h8s.c h8300: IRQ chip driver 2015-06-23 13:35:56 +09:00
irq-renesas-h8300h.c h8300: IRQ chip driver 2015-06-23 13:35:56 +09:00
irq-renesas-intc-irqpin.c irqchip: Constify irq_domain_ops 2015-05-05 10:45:58 +02:00
irq-renesas-irqc.c irqchip: irqc: Remove platform data support 2015-05-05 10:45:59 +02:00
irq-s3c24xx.c irqchip: Constify irq_domain_ops 2015-05-05 10:45:58 +02:00
irq-sa11x0.c Merge branch 'sa1100' into for-next 2015-06-12 21:18:13 +01:00
irq-sirfsoc.c irqchip: sirfsoc: Convert to handle_domain_irq 2014-09-03 13:10:40 +00:00
irq-st.c irqchip: st: Supply new driver for STi based devices 2015-03-03 19:48:53 +00:00
irq-sun4i.c irqchip: Constify irq_domain_ops 2015-05-05 10:45:58 +02:00
irq-sunxi-nmi.c irqchip: sunxi-nmi: Fix off-by-one error in irq iterator 2015-06-08 10:08:50 +02:00
irq-tb10x.c genirq: Generic chip: Change irq_reg_{readl,writel} arguments 2014-11-09 04:01:22 +00:00
irq-tegra.c irqchip: tegra: Set the proper base address in irq chip data 2015-05-13 10:46:07 +02:00
irq-versatile-fpga.c irqchip: Constify irq_domain_ops 2015-05-05 10:45:58 +02:00
irq-vf610-mscm-ir.c Merge branch 'irq/for-arm' into irq/core 2015-05-18 23:59:33 +02:00
irq-vic.c irqchip: Constify irq_domain_ops 2015-05-05 10:45:58 +02:00
irq-vt8500.c irqchip: Constify irq_domain_ops 2015-05-05 10:45:58 +02:00
irq-xtensa-mx.c irqchip: xtensa: Select only an online cpu 2014-03-04 17:37:55 +01:00
irq-xtensa-pic.c xtensa: move built-in PIC to drivers/irqchip 2014-01-14 10:19:56 -08:00
irq-zevio.c irqchip: zevio: Convert to handle_domain_irq 2014-09-03 13:10:48 +00:00
irqchip.c irqchip: Add GICv2 specific ACPI boot support 2015-03-26 15:13:07 +00:00
irqchip.h irqchip: Move IRQCHIP_DECLARE macro to include/linux/irqchip.h 2015-07-02 22:34:38 +02:00
spear-shirq.c Update Viresh Kumar's email address 2015-07-17 16:39:53 -07:00