[PATCH v2 0/4] Some improvements on regs usage

[sxwjean]

From: Xiongwei Song <sxwjean@xxxxxxxxx>

When CONFIG_4xx=y or CONFIG_BOOKE=y, currently in code we reference dsisr
to get interrupt reasons and reference dar to get excepiton address.
However, in reference manuals, esr is used for interrupt reasons and dear
is used for excepiton address, so the patchset changes dsisr -> esr,
dar -> dear for CONFIG_4xx=y or CONFIG_BOOKE=y.

Meanwhile, we use _ESR and _DEAR to get offsets of esr and dear on stack.

v2:
 - Discard changes in arch/powerpc/mm/fault.c as Christophe and Michael
   suggested.
 - Discard changes in UAPI headers to avoid possible compile issue.

v1:
 - https://lkml.org/lkml/2021/8/6/57
 - https://lkml.org/lkml/2021/7/26/533
 - https://lkml.org/lkml/2021/7/26/534
 - https://lkml.org/lkml/2021/7/26/535

Xiongwei Song (4):
  powerpc: Optimize register usage for esr register
  powerpc/64e: Get esr offset with _ESR macro
  powerpc: Optimize register usage for dear register
  powerpc/64e: Get dear offset with _DEAR macro

 arch/powerpc/include/asm/ptrace.h          | 10 ++++++++--
 arch/powerpc/kernel/asm-offsets.c          | 15 ++++-----------
 arch/powerpc/kernel/exceptions-64e.S       | 18 +++++++++---------
 arch/powerpc/kernel/process.c              |  2 +-
 arch/powerpc/kernel/ptrace/ptrace.c        |  4 ++++
 arch/powerpc/kernel/traps.c                |  2 +-
 arch/powerpc/platforms/44x/machine_check.c |  4 ++--
 arch/powerpc/platforms/4xx/machine_check.c |  2 +-
 8 files changed, 30 insertions(+), 27 deletions(-)

-- 
2.30.2