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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
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accessibility
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acpi ACPI / PM: Use target_state to set the device power state 2015-07-28 16:29:08 +02:00
amba
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android
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ata Merge branch 'for-4.2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2015-07-24 16:54:59 -07:00
atm atm: idt77105: Use setup_timer 2015-06-10 22:46:34 -07:00
auxdisplay
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base Fix firmware loader uevent buffer NULL pointer dereference 2015-07-09 11:20:01 -07:00
bcma
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block null_blk: fix use-after-free problem 2015-07-22 13:30:20 -06:00
bluetooth Bluetooth: btbcm: allow btbcm_read_verbose_config to fail on Apple 2015-07-14 22:54:55 +02:00
bus ARM: SoC: driver updates for v4.2 2015-06-26 11:54:29 -07:00
cdrom
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char Merge tag 'tpm-fixes-for-4.2-rc2' of https://github.com/PeterHuewe/linux-tpmdd into for-linus 2015-07-15 21:46:59 +10:00
clk Update Viresh Kumar's email address 2015-07-17 16:39:53 -07:00
clocksource clocksource/imx: Define clocksource for mx27 2015-07-07 10:44:45 +02:00
connector
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cpufreq CPUFREQ: Loongson2: Fix broken build due to incorrect include. 2015-08-03 09:24:59 +02:00
cpuidle suspend-to-idle: Prevent RCU from complaining about tick_freeze() 2015-07-09 22:59:49 +02:00
crypto crypto: nx - Fix reentrancy bugs 2015-07-08 15:14:13 +08:00
dca
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devfreq
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dio
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dma dmaengine fixes for 4.2-rc5 2015-08-01 12:47:04 -07:00
dma-buf
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edac A build fix for octeon_edac from Aaro Koskinen. 2015-07-03 12:10:12 -07:00
eisa
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extcon extcon: Redefine the unique id of supported external connectors without 'enum extcon' type 2015-06-12 17:01:42 -07:00
firewire
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firmware efi: Check for NULL efi kernel parameters 2015-07-30 18:07:11 +01:00
fmc
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gpio Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-07-18 10:27:12 -07:00
gpu i915: temporary fix for DP MST docking station NULL pointer dereference 2015-08-02 11:02:16 -07:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-07-30 11:03:04 -07:00
hsi Fix up implicit <module.h> users that will break later. 2015-07-02 10:25:22 -07:00
hv Drivers: hv: vmbus: Allocate ring buffer memory in NUMA aware fashion 2015-06-12 16:58:33 -07:00
hwmon hwmon: (nct7802) Fix integer overflow seen when writing voltage limits 2015-07-29 20:06:50 -07:00
hwspinlock hwspinlock: qcom: Correct msb in regmap_field 2015-07-01 16:15:05 +03:00
hwtracing/coresight
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i2c i2c: Mark instantiated device nodes with OF_POPULATE 2015-07-09 22:25:54 +02:00
ide Minor merge needed, due to function move. 2015-07-01 10:49:25 -07:00
idle
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iio iio:light:stk3310: make endianness independent of host 2015-07-19 14:54:45 +01:00
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-07-29 09:54:40 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-07-30 11:03:04 -07:00
iommu iommu/amd: Allow non-ATS devices in IOMMUv2 domains 2015-07-31 15:15:41 +02:00
ipack
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irqchip MIPS: SMP: Don't increment irq_count multiple times for call function IPIs 2015-08-03 09:25:12 +02:00
isdn isdn/gigaset: drop unused ldisc methods 2015-07-15 17:24:45 -07:00
leds Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds 2015-07-01 19:09:11 -07:00
lguest Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
macintosh macintosh/ans-lcd: fix build failure after module_init/exit relocation 2015-07-23 20:00:35 +10:00
mailbox Replace module_init with appropriate alternate initcall in non modules. 2015-07-02 10:36:29 -07:00
mcb
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md dm cache: fix device destroy hang due to improper prealloc_used accounting 2015-07-29 14:32:09 -04:00
media x86/mm/pat, drivers/media/ivtv: Move the PAT warning and replace WARN() with pr_warn() 2015-07-21 09:42:54 +02:00
memory Merge branch 'fixes-rc1' into omap-for-v4.2/fixes 2015-07-06 05:33:17 -07:00
memstick memstick: remove deprecated use of pci api 2015-06-30 19:44:57 -07:00
message fusion: remove dead MTRR code 2015-06-13 08:44:14 -07:00
mfd Update Viresh Kumar's email address 2015-07-17 16:39:53 -07:00
misc mei: prevent unloading mei hw modules while the device is opened. 2015-07-22 21:31:05 -07:00
mmc mmc: sdhci-pxav3: fix platform_data is not initialized 2015-07-24 10:18:39 +02:00
mtd Minor merge needed, due to function move. 2015-07-01 10:49:25 -07:00
net stmmac: fix missing MODULE_LICENSE in stmmac_platform 2015-07-31 15:44:24 -07:00
nfc Char/Misc driver patches for 4.2-rc1 2015-06-26 14:51:15 -07:00
ntb NTB: Add split BAR output for debugfs stats 2015-07-04 14:09:32 -04:00
nubus
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nvdimm libnvdimm: fix namespace seed creation 2015-07-25 09:57:56 -07:00
of of: Drop owner assignment from platform and i2c driver 2015-07-27 08:24:39 -05:00
oprofile
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parisc
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parport parport: Revert "parport: fix memory leak" 2015-07-25 12:48:05 -07:00
pci Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-07-01 15:19:35 -07:00
pcmcia Fix up implicit <module.h> users that will break later. 2015-07-02 10:25:22 -07:00
phy phy: berlin-usb: fix divider for BG2 2015-07-15 20:02:09 +05:30
pinctrl Pin control fixes for the v4.2 series: 2015-07-21 15:27:27 -07:00
platform intel_scu_ipc: move local memory initialization out of a mutex 2015-07-14 11:02:44 -07:00
pnp ACPI / PNP: Reserve ACPI resources at the fs_initcall_sync stage 2015-07-06 23:52:21 +02:00
power Replace module_platform_driver with builtin_platform driver in non modules. 2015-07-02 10:42:13 -07:00
powercap
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pps
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ps3
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ptp
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pwm pwm: Changes for v4.2-rc1 2015-06-23 13:32:38 -07:00
rapidio Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-06-23 14:08:54 -07:00
ras
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regulator Merge remote-tracking branches 'regulator/fix/88pm800', 'regulator/fix/max8973', 'regulator/fix/s2mps11' and 'regulator/fix/supply' into regulator-linus 2015-07-24 16:19:25 +01:00
remoteproc remoteproc: fix !CONFIG_OF build breakage 2015-06-18 11:44:41 +03:00
reset
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rpmsg
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rtc rtc: armada38x: Remove unused variable from armada38x_rtc_set_time() 2015-07-18 00:42:31 +02:00
s390 virtio/vhost: fixes for 4.2 2015-07-23 13:07:04 -07:00
sbus
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scsi SCSI fixes on 20150802 2015-08-02 09:36:21 -07:00
sfi
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sh Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-07-01 15:19:35 -07:00
sn
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soc ARM: SoC: late fixes and dependencies 2015-07-02 14:40:49 -07:00
spi Merge remote-tracking branches 'spi/fix/gqspi', 'spi/fix/imx', 'spi/fix/mg-spfi' and 'spi/fix/spidev' into spi-linus 2015-07-24 16:19:50 +01:00
spmi
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ssb
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staging staging: vt6656: check ieee80211_bss_conf bssid not NULL 2015-07-19 11:48:19 +01:00
target iscsi-target: Fix iser explicit logout TX kthread leak 2015-07-24 14:19:44 -07:00
tc
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thermal Minor merge needed, due to function move. 2015-07-01 10:49:25 -07:00
thunderbolt
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tty tty: vt: Fix !TASK_RUNNING diagnostic warning from paste_selection() 2015-07-23 18:08:29 -07:00
uio uio: pruss: Drop depends on ARCH_DAVINCI_DA850 from config 2015-06-12 17:01:43 -07:00
usb USB: OHCI: fix bad #define in ohci-tmio.c 2015-07-22 14:49:42 -07:00
uwb
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vfio vfio: Fix lockdep issue 2015-07-24 15:14:04 -06:00
vhost vhost: fix error handling for memory region alloc 2015-07-27 18:05:05 +03:00
video stifb: Implement hardware accelerated copyarea 2015-07-10 21:44:19 +02:00
virt
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virtio virtio/vhost: cross endian support 2015-07-03 16:02:25 -07:00
vlynq
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vme vme: tsi148: depend on HAS_DMA for Kconfig 2015-06-12 17:31:05 -07:00
w1 w1: use correct lock on error in w1_seq_show() 2015-06-12 16:58:33 -07:00
watchdog Update Viresh Kumar's email address 2015-07-17 16:39:53 -07:00
xen Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-07-04 14:13:43 -07:00
zorro
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Kconfig libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support 2015-06-24 21:24:10 -04:00
Makefile The libnvdimm sub-system introduces, in addition to the libnvdimm-core, 2015-06-29 10:34:42 -07:00