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Sebastian Andrzej Siewior 3bd3706251 sched/core: Provide a pointer to the valid CPU mask 
In commit:

  4b53a3412d ("sched/core: Remove the tsk_nr_cpus_allowed() wrapper")

the tsk_nr_cpus_allowed() wrapper was removed. There was not
much difference in !RT but in RT we used this to implement
migrate_disable(). Within a migrate_disable() section the CPU mask is
restricted to single CPU while the "normal" CPU mask remains untouched.

As an alternative implementation Ingo suggested to use:

	struct task_struct {
		const cpumask_t		*cpus_ptr;
		cpumask_t		cpus_mask;
        };
with
	t->cpus_ptr = &t->cpus_mask;

In -RT we then can switch the cpus_ptr to:

	t->cpus_ptr = &cpumask_of(task_cpu(p));

in a migration disabled region. The rules are simple:

 - Code that 'uses' ->cpus_allowed would use the pointer.
 - Code that 'modifies' ->cpus_allowed would use the direct mask.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20190423142636.14347-1-bigeasy@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
 		2019-06-03 11:49:37 +02:00
..
accessibility treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 70 2019-05-24 17:36:47 +02:00
acpi Power management fixes for 5.2-rc3 2019-05-31 10:38:35 -07:00
amba treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
android treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
ata treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 209 2019-05-30 11:29:53 -07:00
atm treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
auxdisplay treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
base More power management updates for 5.2-rc1 2019-05-15 08:46:44 -07:00
bcma
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block for-linus-20190601 2019-06-02 09:27:44 -07:00
bluetooth treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
bus treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
cdrom treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1 2019-05-21 11:28:39 +02:00
char treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
clk SPDX update for 5.2-rc3, round 1 2019-05-31 08:34:32 -07:00
clocksource treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
connector treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
counter treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
cpufreq treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
cpuidle treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 215 2019-05-30 11:29:54 -07:00
crypto crypto: ux500 - fix license comment syntax error 2019-06-01 18:29:58 +02:00
dax libnvdimm fixes v5.2-rc2 2019-05-25 10:11:23 -07:00
dca treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 33 2019-05-24 17:27:11 +02:00
devfreq treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
dio treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
dma treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
dma-buf treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
edac treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
eisa treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 210 2019-05-30 11:29:53 -07:00
extcon treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
firewire treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
firmware Merge branch 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-06-02 11:06:13 -07:00
fmc treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 60 2019-05-24 17:36:45 +02:00
fpga treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
fsi treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
gnss treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
gpio SPDX update for 5.2-rc3, round 1 2019-05-31 08:34:32 -07:00
gpu SPDX update for 5.2-rc3, round 1 2019-05-31 08:34:32 -07:00
hid treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 178 2019-05-30 11:29:19 -07:00
hsi treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
hv
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hwmon treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 197 2019-05-30 11:29:22 -07:00
hwspinlock
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hwtracing treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
i2c Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-06-02 10:18:11 -07:00
i3c treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
ide treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
idle treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
iio SPDX update for 5.2-rc3, round 1 2019-05-31 08:34:32 -07:00
infiniband sched/core: Provide a pointer to the valid CPU mask 2019-06-03 11:49:37 +02:00
input treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 197 2019-05-30 11:29:22 -07:00
interconnect treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
iommu drivers/iommu/intel-iommu.c: fix variable 'iommu' set but not used 2019-06-01 15:51:32 -07:00
ipack treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
irqchip treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
isdn SPDX update for 5.2-rc3, round 1 2019-05-31 08:34:32 -07:00
leds LED fix for 5.2-rc3 2019-06-02 10:14:25 -07:00
lightnvm treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
macintosh treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mailbox treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
mcb treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
md treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
media SPDX update for 5.2-rc3, round 1 2019-05-31 08:34:32 -07:00
memory treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
memstick treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 17 2019-05-21 11:28:46 +02:00
message treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
mfd treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
misc treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
mmc treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
mtd treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
mux
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net SPDX update for 5.2-rc3, round 1 2019-05-31 08:34:32 -07:00
nfc treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
ntb treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
nubus treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
nvdimm libnvdimm fixes v5.2-rc2 2019-05-25 10:11:23 -07:00
nvme for-linus-20190524 2019-05-24 16:02:14 -07:00
nvmem treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
of of_net: Fix missing of_find_device_by_node ref count drop 2019-05-13 08:52:37 -07:00
opp treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
oprofile
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parisc treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 217 2019-05-30 11:29:54 -07:00
parport treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
pci PCI: PM: Avoid possible suspend-to-idle issue 2019-05-27 10:55:08 +02:00
pcmcia treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
perf treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
phy treewide: fix typos of SPDX-License-Identifier 2019-06-01 18:29:58 +02:00
pinctrl treewide: fix typos of SPDX-License-Identifier 2019-06-01 18:29:58 +02:00
platform treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
pnp treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 150 2019-05-30 11:25:19 -07:00
power treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 218 2019-05-30 11:29:54 -07:00
powercap treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
pps treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
ps3 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 2019-05-30 11:26:39 -07:00
ptp treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 2019-05-30 11:26:39 -07:00
pwm treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
rapidio treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
ras treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
regulator treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
remoteproc treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
reset treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
rpmsg
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rtc treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
s390 SCSI fixes on 20190601 2019-06-02 09:26:34 -07:00
sbus treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
scsi SCSI fixes on 20190601 2019-06-02 09:26:34 -07:00
sfi treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
sh treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
siox treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
slimbus
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sn treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
soc treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 207 2019-05-30 11:29:53 -07:00
soundwire treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
spi treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
spmi treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
ssb treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
staging Staging/IIO driver fixes for 5.2-rc3 2019-05-31 08:31:45 -07:00
target treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
tc treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
tee treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
thermal Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal 2019-06-02 10:16:09 -07:00
thunderbolt treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
tty vt/fbcon: deinitialize resources in visual_init() after failed memory allocation 2019-05-24 17:08:18 +02:00
uio treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
usb usbip: usbip_host: fix stub_dev lock context imbalance regression 2019-05-29 13:26:32 -07:00
uwb treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
vfio treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
vhost treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
video SPDX update for 5.2-rc3, round 1 2019-05-31 08:34:32 -07:00
virt treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
virtio treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 102 2019-05-24 17:39:00 +02:00
visorbus treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
vlynq treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 102 2019-05-24 17:39:00 +02:00
vme treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
w1 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
watchdog treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
xen xen: fixes for 5.2-rc3 2019-05-31 10:53:34 -07:00
zorro treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
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