https://github.com/torvalds/linux
Revision e2c631ba75a7e727e8db0a9d30a06bfd434adb3a authored by Peter Zijlstra on 05 September 2018, 08:41:58 UTC, committed by Thomas Gleixner on 06 September 2018, 21:38:35 UTC
I turns out that the silly spawn kthread from worker was actually needed.
clocksource_watchdog_kthread() cannot be called directly from
clocksource_watchdog_work(), because clocksource_select() calls
timekeeping_notify() which uses stop_machine(). One cannot use
stop_machine() from a workqueue() due lock inversions wrt CPU hotplug.
Revert the patch but add a comment that explain why we jump through such
apparently silly hoops.
Fixes: 7197e77abcb6 ("clocksource: Remove kthread")
Reported-by: Siegfried Metz <frame@mailbox.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Niklas Cassel <niklas.cassel@linaro.org>
Tested-by: Kevin Shanahan <kevin@shanahan.id.au>
Tested-by: viktor_jaegerskuepper@freenet.de
Tested-by: Siegfried Metz <frame@mailbox.org>
Cc: rafael.j.wysocki@intel.com
Cc: len.brown@intel.com
Cc: diego.viola@gmail.com
Cc: rui.zhang@intel.com
Cc: bjorn.andersson@linaro.org
Link: https://lkml.kernel.org/r/20180905084158.GR24124@hirez.programming.kicks-ass.net
1 parent c43c5e9
Tip revision: e2c631ba75a7e727e8db0a9d30a06bfd434adb3a authored by Peter Zijlstra on 05 September 2018, 08:41:58 UTC
clocksource: Revert "Remove kthread"
clocksource: Revert "Remove kthread"
Tip revision: e2c631b
| File | Mode | Size |
|---|---|---|
| 9p | ||
| adfs | ||
| affs | ||
| afs | ||
| autofs | ||
| befs | ||
| bfs | ||
| btrfs | ||
| cachefiles | ||
| ceph | ||
| cifs | ||
| coda | ||
| configfs | ||
| cramfs | ||
| crypto | ||
| debugfs | ||
| devpts | ||
| dlm | ||
| ecryptfs | ||
| efivarfs | ||
| efs | ||
| exofs | ||
| exportfs | ||
| ext2 | ||
| ext4 | ||
| f2fs | ||
| fat | ||
| freevxfs | ||
| fscache | ||
| fuse | ||
| gfs2 | ||
| hfs | ||
| hfsplus | ||
| hostfs | ||
| hpfs | ||
| hugetlbfs | ||
| isofs | ||
| jbd2 | ||
| jffs2 | ||
| jfs | ||
| kernfs | ||
| lockd | ||
| minix | ||
| nfs | ||
| nfs_common | ||
| nfsd | ||
| nilfs2 | ||
| nls | ||
| notify | ||
| ntfs | ||
| ocfs2 | ||
| omfs | ||
| openpromfs | ||
| orangefs | ||
| overlayfs | ||
| proc | ||
| pstore | ||
| qnx4 | ||
| qnx6 | ||
| quota | ||
| ramfs | ||
| reiserfs | ||
| romfs | ||
| squashfs | ||
| sysfs | ||
| sysv | ||
| tracefs | ||
| ubifs | ||
| udf | ||
| ufs | ||
| xfs | ||
| Kconfig | -rw-r--r-- | 7.4 KB |
| Kconfig.binfmt | -rw-r--r-- | 7.2 KB |
| Makefile | -rw-r--r-- | 4.2 KB |
| aio.c | -rw-r--r-- | 54.4 KB |
| anon_inodes.c | -rw-r--r-- | 4.5 KB |
| attr.c | -rw-r--r-- | 9.7 KB |
| bad_inode.c | -rw-r--r-- | 5.3 KB |
| binfmt_aout.c | -rw-r--r-- | 10.8 KB |
| binfmt_elf.c | -rw-r--r-- | 63.7 KB |
| binfmt_elf_fdpic.c | -rw-r--r-- | 47.3 KB |
| binfmt_em86.c | -rw-r--r-- | 2.8 KB |
| binfmt_flat.c | -rw-r--r-- | 27.7 KB |
| binfmt_misc.c | -rw-r--r-- | 18.3 KB |
| binfmt_script.c | -rw-r--r-- | 3.0 KB |
| block_dev.c | -rw-r--r-- | 53.8 KB |
| buffer.c | -rw-r--r-- | 89.9 KB |
| char_dev.c | -rw-r--r-- | 16.6 KB |
| compat.c | -rw-r--r-- | 3.4 KB |
| compat_binfmt_elf.c | -rw-r--r-- | 3.4 KB |
| compat_ioctl.c | -rw-r--r-- | 41.1 KB |
| coredump.c | -rw-r--r-- | 21.2 KB |
| d_path.c | -rw-r--r-- | 11.2 KB |
| dax.c | -rw-r--r-- | 49.3 KB |
| dcache.c | -rw-r--r-- | 81.7 KB |
| dcookies.c | -rw-r--r-- | 7.0 KB |
| direct-io.c | -rw-r--r-- | 40.8 KB |
| drop_caches.c | -rw-r--r-- | 1.6 KB |
| eventfd.c | -rw-r--r-- | 10.8 KB |
| eventpoll.c | -rw-r--r-- | 62.8 KB |
| exec.c | -rw-r--r-- | 47.0 KB |
| fcntl.c | -rw-r--r-- | 23.3 KB |
| fhandle.c | -rw-r--r-- | 6.8 KB |
| file.c | -rw-r--r-- | 23.4 KB |
| file_table.c | -rw-r--r-- | 10.0 KB |
| filesystems.c | -rw-r--r-- | 6.2 KB |
| fs-writeback.c | -rw-r--r-- | 70.7 KB |
| fs_pin.c | -rw-r--r-- | 2.0 KB |
| fs_struct.c | -rw-r--r-- | 3.3 KB |
| inode.c | -rw-r--r-- | 56.6 KB |
| internal.h | -rw-r--r-- | 5.0 KB |
| ioctl.c | -rw-r--r-- | 17.5 KB |
| iomap.c | -rw-r--r-- | 52.1 KB |
| libfs.c | -rw-r--r-- | 31.8 KB |
| locks.c | -rw-r--r-- | 73.1 KB |
| mbcache.c | -rw-r--r-- | 12.0 KB |
| mount.h | -rw-r--r-- | 3.9 KB |
| mpage.c | -rw-r--r-- | 21.1 KB |
| namei.c | -rw-r--r-- | 123.0 KB |
| namespace.c | -rw-r--r-- | 84.3 KB |
| no-block.c | -rw-r--r-- | 688 bytes |
| nsfs.c | -rw-r--r-- | 6.2 KB |
| open.c | -rw-r--r-- | 28.4 KB |
| pipe.c | -rw-r--r-- | 26.9 KB |
| pnode.c | -rw-r--r-- | 15.3 KB |
| pnode.h | -rw-r--r-- | 1.9 KB |
| posix_acl.c | -rw-r--r-- | 21.4 KB |
| proc_namespace.c | -rw-r--r-- | 7.8 KB |
| read_write.c | -rw-r--r-- | 47.7 KB |
| readdir.c | -rw-r--r-- | 11.4 KB |
| select.c | -rw-r--r-- | 34.6 KB |
| seq_file.c | -rw-r--r-- | 24.4 KB |
| signalfd.c | -rw-r--r-- | 9.0 KB |
| splice.c | -rw-r--r-- | 39.6 KB |
| stack.c | -rw-r--r-- | 2.5 KB |
| stat.c | -rw-r--r-- | 19.3 KB |
| statfs.c | -rw-r--r-- | 9.7 KB |
| super.c | -rw-r--r-- | 40.4 KB |
| sync.c | -rw-r--r-- | 9.9 KB |
| timerfd.c | -rw-r--r-- | 13.4 KB |
| userfaultfd.c | -rw-r--r-- | 49.8 KB |
| utimes.c | -rw-r--r-- | 7.5 KB |
| xattr.c | -rw-r--r-- | 23.4 KB |
Computing file changes ...
