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Filename Latest commit message Latest commit date
Dietmar Eggemann f6c771f16f ARM: 8943/1: Fix topology setup in case of CPU hotplug for CONFIG_SCHED_MC 
commit ff98a5f624d2910de050f1fc7f2a32769da86b51 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-17 19:48:55 +01:00
arch ARM: 8943/1: Fix topology setup in case of CPU hotplug for CONFIG_SCHED_MC 2020-01-17 19:48:55 +01:00
block fs: move guard_bio_eod() after bio_set_op_attrs 2020-01-17 19:48:21 +01:00
certs
crypto crypto: algif_skcipher - Use chunksize instead of blocksize 2020-01-17 19:48:46 +01:00
Documentation mei: fix modalias documentation 2020-01-17 19:48:48 +01:00
drivers tty: serial: pch_uart: correct usage of dma_unmap_sg 2020-01-17 19:48:55 +01:00
fs gfs2: add compat_ioctl support 2020-01-17 19:48:52 +01:00
include crypto: algif_skcipher - Use chunksize instead of blocksize 2020-01-17 19:48:46 +01:00
init
ipc
kernel keys: Fix request_key() cache 2020-01-17 19:48:42 +01:00
lib sbitmap: only queue kyber's wait callback if not already active 2020-01-12 12:21:44 +01:00
LICENSES
mm uaccess: Add non-pagefault user-space write function 2020-01-17 19:48:40 +01:00
net compat_ioctl: handle SIOCOUTQNSD 2020-01-17 19:48:52 +01:00
samples samples: bpf: fix syscall_tp due to unused syscall 2020-01-12 12:21:26 +01:00
scripts bpf: Support pre-2.25-binutils objcopy for vmlinux BTF 2020-01-17 19:48:41 +01:00
security apparmor: fix aa_xattrs_match() may sleep while holding a RCU lock 2020-01-09 10:20:00 +01:00
sound ASoC: rsnd: fix DALIGN register for SSIU 2020-01-17 19:48:35 +01:00
tools tools: PCI: Fix fd leakage 2020-01-17 19:48:54 +01:00
usr gen_initramfs_list.sh: fix 'bad variable name' error 2020-01-09 10:20:00 +01:00
virt KVM: arm/arm64: Properly handle faulting of device mappings 2019-12-31 16:46:24 +01:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS MAINTAINERS: Append missed file to the database 2020-01-17 19:48:28 +01:00
Makefile Linux 5.4.12 2020-01-14 20:08:40 +01:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.