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Peter Zijlstra a9b2e4a94e kthread: Extract KTHREAD_IS_PER_CPU 
[ Upstream commit ac687e6e8c ]

There is a need to distinguish geniune per-cpu kthreads from kthreads
that happen to have a single CPU affinity.

Geniune per-cpu kthreads are kthreads that are CPU affine for
correctness, these will obviously have PF_KTHREAD set, but must also
have PF_NO_SETAFFINITY set, lest userspace modify their affinity and
ruins things.

However, these two things are not sufficient, PF_NO_SETAFFINITY is
also set on other tasks that have their affinities controlled through
other means, like for instance workqueues.

Therefore another bit is needed; it turns out kthread_create_per_cpu()
already has such a bit: KTHREAD_IS_PER_CPU, which is used to make
kthread_park()/kthread_unpark() work correctly.

Expose this flag and remove the implicit setting of it from
kthread_create_on_cpu(); the io_uring usage of it seems dubious at
best.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Tested-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lkml.kernel.org/r/20210121103506.557620262@infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-02-07 14:47:41 +01:00
arch x86: __always_inline __{rd,wr}msr() 2021-02-07 14:47:40 +01:00
block block: fix use-after-free in disk_part_iter_next 2021-01-17 13:59:01 +01:00
certs Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
crypto crypto: ecdh - avoid buffer overflow in ecdh_set_secret() 2021-01-12 20:09:09 +01:00
Documentation USB: UAS: introduce a quirk to set no_write_same 2020-12-29 13:46:46 +01:00
drivers scsi: ibmvfc: Set default timeout to avoid crash during migration 2021-02-07 14:47:41 +01:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:20:30 +01:00
fs fs: fix lazytime expiration handling in __writeback_single_inode() 2021-01-30 13:31:17 +01:00
include kthread: Extract KTHREAD_IS_PER_CPU 2021-02-07 14:47:41 +01:00
init printk: reduce LOG_BUF_SHIFT range for H8300 2020-11-05 11:06:55 +01:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:17:07 +02:00
kernel kthread: Extract KTHREAD_IS_PER_CPU 2021-02-07 14:47:41 +01:00
lib lib/genalloc: fix the overflow when size is too big 2021-01-12 20:09:06 +01:00
mm Revert "mm/slub: fix a memory leak in sysfs_slab_add()" 2021-01-30 13:31:15 +01:00
net mac80211: fix fast-rx encryption check 2021-02-07 14:47:41 +01:00
samples samples: bpf: Fix lwt_len_hist reusing previous BPF map 2020-12-29 13:46:56 +01:00
scripts depmod: handle the case of /sbin/depmod without /sbin in PATH 2021-01-12 20:09:06 +01:00
security dump_common_audit_data(): fix racy accesses to ->d_name 2021-01-23 15:48:43 +01:00
sound ASoC: Intel: haswell: Add missing pm_ops 2021-01-30 13:31:12 +01:00
tools objtool: Don't fail on missing symbol table 2021-02-07 14:47:41 +01:00
usr initramfs: restore default compression behavior 2020-04-13 10:34:19 +02:00
virt KVM: fix overflow of zero page refcount with ksm running 2020-10-01 13:12:33 +02:00
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MAINTAINERS MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 16:36:12 +01:00
Makefile Linux 4.14.219 2021-02-03 23:22:23 +01:00
README

README 

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.