[PATCH 0/4] s390: Consistent usage of text_mutex

[Heiko Carstens <hca@linux.ibm.com>]

Other architectures serialize kernel text patching with text_mutex. s390
does not: __s390_kernel_write() relies on a private spinlock, and callers
partially depend on implicit exclusion (e.g. no kprobe can be set on a
jump label).

Make s390 consistent with other architectures:

- Patches 1-3 add text_mutex to the jump_label, ftrace and bpf text
  patching paths

- Patch 4 removes the redundant spinlock from __s390_kernel_write().
  CPU serialization, previously done implicitly, is now explicit via
  sync_core()

Thanks,
Heiko

Heiko Carstens (4):
  s390/jump_label: Serialize text patching with text_mutex
  s390/ftrace: Serialize text patching with text_mutex
  s390/bpf: Serialize text patching with text_mutex
  s390/maccess: Remove spinlock from __s390_kernel_write()

 arch/s390/kernel/ftrace.c     |  9 +++++++++
 arch/s390/kernel/jump_label.c |  3 +++
 arch/s390/mm/maccess.c        |  9 ++++-----
 arch/s390/net/bpf_jit_comp.c  | 21 +++++++++++++++++----
 4 files changed, 33 insertions(+), 9 deletions(-)

-- 
2.53.0