[PATCH v3 0/4] um: Make errno multi-thread safe

[Tiwei Bie]

v3:
- Fix os_kill_helper_thread() (reported by Johannes);

v2 (https://lore.kernel.org/all/20250306150747.2926434-1-tiwei.btw@antgroup.com/):
- Do not define the thread handle type as void *;
- Minor tweaks to commit messages, log and comments;

v1:
https://lore.kernel.org/all/20250221084049.1332318-1-tiwei.btw@antgroup.com/

Tiwei Bie (4):
  um: Add pthread-based helper support
  um: ubd: Switch to the pthread-based helper
  um: Switch to the pthread-based helper in sigio workaround
  um: Prohibit the VM_CLONE flag in run_helper_thread()

 arch/um/drivers/ubd.h       |  6 ++--
 arch/um/drivers/ubd_kern.c  | 25 ++++++--------
 arch/um/drivers/ubd_user.c  | 14 ++++----
 arch/um/include/shared/os.h |  5 +++
 arch/um/os-Linux/helper.c   | 67 +++++++++++++++++++++++++++++++++++++
 arch/um/os-Linux/sigio.c    | 44 +++++++++++-------------
 6 files changed, 113 insertions(+), 48 deletions(-)

-- 
2.34.1