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

  4b53a3412d66 ("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
..
9p
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adfs
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affs
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afs
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autofs
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befs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
bfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
btrfs
for-5.2-rc2-tag
2019-05-30 20:52:40 -07:00
cachefiles
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2019-05-24 17:27:11 +02:00
ceph
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2019-05-30 11:29:21 -07:00
cifs
4 small smb3 fixes, one for stable
2019-05-31 13:49:50 -07:00
coda
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
configfs
SPDX update for 5.2-rc3, round 1
2019-05-31 08:34:32 -07:00
cramfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
crypto
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2019-05-21 10:50:46 +02:00
debugfs
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2019-05-21 10:50:46 +02:00
devpts
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2019-05-24 17:37:52 +02:00
dlm
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2019-05-30 11:29:21 -07:00
ecryptfs
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2019-05-30 11:26:35 -07:00
efivarfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
efs
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2019-05-21 10:50:46 +02:00
exportfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
ext2
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
ext4
Bug fixes (including a regression fix) for ext4.
2019-05-25 15:03:12 -07:00
f2fs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
fat
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2019-05-30 11:29:53 -07:00
freevxfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
fscache
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2019-05-30 11:26:32 -07:00
fuse
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
gfs2
Fix a gfs2 sign extension bug introduced in v4.3.
2019-05-22 08:31:09 -07:00
hfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
hfsplus
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
hostfs
This pull request contains the following changes for UML:
2019-05-12 17:52:13 -04:00
hpfs
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2019-05-21 10:50:46 +02:00
hugetlbfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
isofs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 142
2019-05-30 11:25:17 -07:00
jbd2
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
jffs2
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
jfs
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2019-05-30 11:26:35 -07:00
kernfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
lockd
Revert "lockd: Show pid of lockd for remote locks"
2019-05-31 09:43:26 -04:00
minix
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
nfs
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2019-05-30 11:26:32 -07:00
nfs_common
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nfsd
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2019-05-21 11:28:39 +02:00
nilfs2
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
nls
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2019-05-21 10:50:46 +02:00
notify
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2019-05-24 17:39:02 +02:00
ntfs
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2019-05-24 17:37:53 +02:00
ocfs2
ocfs2: fix error path kobject memory leak
2019-06-01 15:51:31 -07:00
omfs
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2019-05-30 11:29:53 -07:00
openpromfs
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2019-05-21 10:50:46 +02:00
orangefs
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2019-05-21 10:50:46 +02:00
overlayfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
proc
sched/core: Provide a pointer to the valid CPU mask
2019-06-03 11:49:37 +02:00
pstore
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
qnx4
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
qnx6
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
quota
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
ramfs
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2019-05-30 11:26:32 -07:00
reiserfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
romfs
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2019-05-30 11:26:32 -07:00
squashfs
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2019-05-24 17:39:02 +02:00
sysfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
sysv
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
tracefs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
ubifs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
udf
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
ufs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
unicode
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
xfs
Fixes for 5.1:
2019-05-23 11:18:18 -07:00
aio.c
aio: use kmem_cache_free() instead of kfree()
2019-04-04 20:13:59 -04:00
anon_inodes.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
attr.c
…
bad_inode.c
…
binfmt_aout.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
binfmt_elf_fdpic.c
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binfmt_elf.c
treewide: Add SPDX license identifier for more missed files
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binfmt_em86.c
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2019-05-21 10:50:45 +02:00
binfmt_flat.c
…
binfmt_misc.c
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binfmt_script.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
block_dev.c
block: Don't revalidate bdev of hidden gendisk
2019-05-27 07:35:02 -06:00
buffer.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
char_dev.c
chardev: update comment based on the code
2019-04-02 17:49:58 +02:00
compat_binfmt_elf.c
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2019-05-30 11:29:21 -07:00
compat_ioctl.c
media updates for v4.20-rc1
2018-10-29 14:29:58 -07:00
compat.c
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coredump.c
…
d_path.c
…
dax.c
mm: page_mkclean vs MADV_DONTNEED race
2019-05-14 09:47:48 -07:00
dcache.c
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dcookies.c
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2019-05-21 10:50:45 +02:00
direct-io.c
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2019-05-21 10:50:45 +02:00
drop_caches.c
fs/drop_caches.c: avoid softlockups in drop_pagecache_sb()
2019-02-01 15:46:24 -08:00
eventfd.c
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2019-05-21 10:50:45 +02:00
eventpoll.c
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2019-05-30 11:26:32 -07:00
exec.c
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2019-05-21 10:50:45 +02:00
fcntl.c
fs: mark expected switch fall-throughs
2019-04-08 18:21:02 -05:00
fhandle.c
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file_table.c
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2019-05-21 10:50:45 +02:00
file.c
io_uring-2019-03-06
2019-03-08 14:48:40 -08:00
filesystems.c
vfs: Implement a filesystem superblock creation/configuration context
2019-02-28 03:29:26 -05:00
fs_context.c
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2019-05-24 17:27:11 +02:00
fs_parser.c
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2019-05-24 17:27:11 +02:00
fs_pin.c
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fs_struct.c
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fs_types.c
fs: common implementation of file type
2019-01-21 17:48:13 +01:00
fs-writeback.c
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fsopen.c
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2019-05-24 17:27:11 +02:00
inode.c
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2019-05-21 10:50:45 +02:00
internal.h
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2019-05-30 11:26:32 -07:00
io_uring.c
io_uring: Fix __io_uring_register() false success
2019-05-26 09:25:06 -06:00
ioctl.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
iomap.c
for-5.2/block-20190507
2019-05-07 18:14:36 -07:00
Kconfig
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
Kconfig.binfmt
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libfs.c
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2019-05-21 10:50:45 +02:00
locks.c
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2019-05-21 10:50:45 +02:00
Makefile
Add as a feature case-insensitive directories (the casefold feature)
2019-05-07 21:12:44 -07:00
mbcache.c
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2019-05-21 10:50:45 +02:00
mount.h
saner handling of temporary namespaces
2019-01-30 17:44:07 -05:00
mpage.c
block: remove the i argument to bio_for_each_segment_all
2019-04-30 09:26:13 -06:00
namei.c
Clean up fscrypt's dcache revalidation support, and other
2019-05-07 21:28:04 -07:00
namespace.c
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2019-05-30 11:29:53 -07:00
no-block.c
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2019-05-30 11:26:32 -07:00
nsfs.c
nsfs: unobfuscate
2019-04-09 19:20:57 -04:00
open.c
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2019-05-21 10:50:45 +02:00
pipe.c
Merge branch 'page-refs' (page ref overflow)
2019-04-14 15:09:40 -07:00
pnode.c
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2019-05-30 11:29:53 -07:00
pnode.h
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posix_acl.c
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2019-05-21 10:50:45 +02:00
proc_namespace.c
…
read_write.c
vfs: pass ppos=NULL to .read()/.write() of FMODE_STREAM files
2019-05-06 17:46:52 +03:00
readdir.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
select.c
y2038: syscalls: rename y2038 compat syscalls
2019-02-07 00:13:27 +01:00
seq_file.c
fs: mark expected switch fall-throughs
2019-04-08 18:21:02 -05:00
signalfd.c
fs: mark expected switch fall-throughs
2019-04-08 18:21:02 -05:00
splice.c
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2019-05-21 10:50:45 +02:00
stack.c
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2019-05-21 10:50:45 +02:00
stat.c
fs: move generic stat response attr handling to vfs_getattr_nosec
2019-02-01 01:55:45 -05:00
statfs.c
vfs: add vfs_get_fsid() helper
2019-02-07 16:38:35 +01:00
super.c
[fix] get rid of checking for absent device name in vfs_get_tree()
2019-04-28 21:34:21 -04:00
sync.c
fs/sync.c: sync_file_range(2) may use WB_SYNC_ALL writeback
2019-05-14 09:47:50 -07:00
timerfd.c
y2038: syscalls: rename y2038 compat syscalls
2019-02-07 00:13:27 +01:00
userfaultfd.c
userfaultfd/sysctl: add vm.unprivileged_userfaultfd
2019-05-14 09:47:45 -07:00
utimes.c
y2038: syscalls: rename y2038 compat syscalls
2019-02-07 00:13:27 +01:00
xattr.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00