Most of this is only about cleaning up the percpu code after preemptible
this_cpu_*() operations have been implemented. The first ten patches are
all more or less trivial cleanup patches trying to make the code shorter
and more readable.

The only non-trivial patch is the last one, which converts s390's
this_cpu_*() operations to use a similar scheme like Mark Rutland
provided it for arm64 [1]. This allows to simplify the irq entry and exit
path, however at the cost of slightly worse code for this_cpu_*()
operations.

The simplified irq entry and exit code seems to be worth it. Usable
performance numbers are not available yet, however I don't expect big
difference to before.

[1] https://lore.kernel.org/all/20260904161758.376504-1-mark.rutland@arm.com/

Thanks,
Heiko

Heiko Carstens (12):
  s390/percpu: Fix comment typo
  s390/percpu: Add sanity check to GEN_MVIY macro
  s390/lowcore: Remove _AC() from LOWCORE_ALT_ADDRESS
  s390/percpu: Let MVIY_PERCPU() calculate alternative displacement
  s390/percpu/lowcore: Add and use LC_PERCPU lowcore offset defines
  s390/percpu: Rename inline assembly symbolic names
  s390/percpu: Use __PCPU_BEGIN() and __PCPU_END() for inline assemblies
  s390/percpu: Use percpu code section for this_cpu_cmpxchg128()
  s390/percpu: Use percpu code section for this_cpu_xchg()
  s390/percpu: Use percpu code section for this_cpu_cmpxchg()
  s390: Add CC_HAS_ASM_M_FORMAT_FLAG config option
  s390/percpu: Rework to simplify percpu_entry() and percpu_exit()

 arch/s390/Kconfig                    |   6 +
 arch/s390/include/asm/entry-percpu.h |  74 ++----
 arch/s390/include/asm/lowcore.h      |   5 +-
 arch/s390/include/asm/percpu.h       | 381 +++++++++++++++++----------
 arch/s390/include/asm/ptrace.h       |   1 -
 arch/s390/kernel/irq.c               |  10 +-
 arch/s390/kernel/nmi.c               |   4 +-
 arch/s390/kernel/traps.c             |   4 +-
 8 files changed, 279 insertions(+), 206 deletions(-)

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2.53.0