Dietmar Eggemann ff98a5f624 ARM: 8943/1: Fix topology setup in case of CPU hotplug for CONFIG_SCHED_MC ... Commit ca74b316df ("arm: Use common cpu_topology structure and functions.") changed cpu_coregroup_mask() from the ARM32 specific implementation in arch/arm/include/asm/topology.h to the one shared with ARM64 and RISCV in drivers/base/arch_topology.c. Currently on ARM32 (TC2 w/ CONFIG_SCHED_MC) the task scheduler setup code (w/ CONFIG_SCHED_DEBUG) shows this during CPU hotplug: ERROR: groups don't span domain->span It happens to CPUs of the cluster of the CPU which gets hot-plugged out on scheduler domain MC. Turns out that the shared cpu_coregroup_mask() requires that the hot-plugged CPU is removed from the core_sibling mask via remove_cpu_topology(). Otherwise the 'is core_sibling subset of cpumask_of_node()' doesn't work. In this case the task scheduler has to deal with cpumask_of_node instead of core_sibling which is wrong on scheduler domain MC. e.g. CPU3 hot-plugged out on TC2 [cluster0: 0,3-4 cluster1: 1-2]: cpu_coregroup_mask(): CPU3 cpumask_of_node=0-2,4 core_sibling=0,3-4 ^ should be: cpu_coregroup_mask(): CPU3 cpumask_of_node=0-2,4 core_sibling=0,4 Add remove_cpu_topology() to __cpu_disable() to remove the CPU from the topology masks in case of a CPU hotplug out operation. At the same time tweak store_cpu_topology() slightly so it will call update_siblings_masks() in case of CPU hotplug in operation via secondary_start_kernel()->smp_store_cpu_info(). This aligns the ARM32 implementation with the ARM64 one. Guarding remove_cpu_topology() with CONFIG_GENERIC_ARCH_TOPOLOGY is necessary since some Arm32 defconfigs (aspeed_g5_defconfig, milbeaut_m10v_defconfig, spear13xx_defconfig) specify an explicit # CONFIG_ARM_CPU_TOPOLOGY is not set w/ ./arch/arm/Kconfig: select GENERIC_ARCH_TOPOLOGY if ARM_CPU_TOPOLOGY Fixes: ca74b316df ("arm: Use common cpu_topology structure and functions") Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com> Tested-by: Lukasz Luba <lukasz.luba@arm.com> Tested-by: Ondrej Jirman <megous@megous.com> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>		2019-12-06 11:51:02 +00:00
..
boot	ARM: 8939/1: kbuild: use correct nm executable	2019-11-22 00:19:11 +00:00
common
configs
crypto
include	ARM: 8940/1: ftrace: remove mcount(),ftrace_caller_old() and ftrace_call_old()	2019-11-22 00:19:16 +00:00
kernel	ARM: 8943/1: Fix topology setup in case of CPU hotplug for CONFIG_SCHED_MC	2019-12-06 11:51:02 +00:00
kvm
lib
mach-actions
mach-alpine
mach-artpec
mach-asm9260
mach-aspeed
mach-at91
mach-axxia
mach-bcm
mach-berlin
mach-clps711x
mach-cns3xxx
mach-davinci
mach-digicolor
mach-dove
mach-ebsa110
mach-efm32
mach-ep93xx
mach-exynos
mach-footbridge	ARM: 8911/1: move pcibios_report_status to <asm/pci.h>	2019-10-27 21:14:40 +00:00
mach-gemini
mach-highbank
mach-hisi
mach-imx
mach-integrator
mach-iop32x
mach-ixp4xx
mach-keystone
mach-lpc18xx
mach-lpc32xx
mach-mediatek
mach-meson
mach-milbeaut
mach-mmp
mach-moxart
mach-mv78xx0
mach-mvebu
mach-mxs
mach-nomadik
mach-npcm
mach-nspire
mach-omap1
mach-omap2
mach-orion5x
mach-oxnas
mach-picoxcell
mach-prima2
mach-pxa
mach-qcom
mach-rda
mach-realview
mach-rockchip
mach-rpc
mach-s3c24xx
mach-s3c64xx
mach-s5pv210
mach-sa1100
mach-shmobile
mach-socfpga
mach-spear
mach-sti
mach-stm32
mach-sunxi
mach-tango
mach-tegra
mach-u300
mach-uniphier
mach-ux500
mach-versatile
mach-vexpress
mach-vt8500
mach-zx
mach-zynq
mm	ARM: 8937/1: spectre-v2: remove Brahma-B53 from hardening	2019-11-16 10:51:23 +00:00
net
nwfpe
oprofile
plat-omap
plat-orion
plat-pxa
plat-samsung
plat-versatile
probes
tools
vdso	ARM: 8932/1: Add clock_gettime64 entry point	2019-11-15 22:21:15 +00:00
vfp
xen
Kconfig	ARM: 8928/1: ARM_ERRATA_775420: Spelling s/date/data/	2019-10-31 16:58:57 +00:00
Kconfig-nommu
Kconfig.debug
Makefile