[PATCH v6 0/2] arm64: Fix pending single-step debugging issues

[Sumit Garg]

This patch-set reworks pending fixes from Wei's series [1] to make
single-step debugging via kgdb/kdb on arm64 work as expected. There was
a prior discussion on ML [2] regarding if we should keep the interrupts
enabled during single-stepping. So patch #1 follows suggestion from Will
[3] to not disable interrupts during single stepping but rather skip
single stepping within interrupt handler.

[1] https://lore.kernel.org/all/20200509214159.19680-1-liwei391@huawei.com/
[2] https://lore.kernel.org/all/CAD=FV=Voyfq3Qz0T3RY+aYWYJ0utdH=P_AweB=13rcV8GDBeyQ@mail.gmail.com/
[3] https://lore.kernel.org/all/20200626095551.GA9312@willie-the-truck/

Changes in v6:
- Fix incorrect rescheduling check introduced by rework for v5.
- Patch #2: s/kernel_regs_reset_single_step/kernel_rewind_single_step/
- Collected Daniel's tags.

Changes in v5:
- Incorporated misc. comments from Mark.

Changes in v4:
- Rebased to the tip of mainline.
- Picked up Doug's Tested-by tag.

Changes in v3:
- Reword commit descriptions as per Daniel's suggestions.

Changes in v2:
- Replace patch #1 to rather follow Will's suggestion.

Sumit Garg (2):
  arm64: entry: Skip single stepping into interrupt handlers
  arm64: kgdb: Set PSTATE.SS to 1 to re-enable single-step

 arch/arm64/include/asm/debug-monitors.h |  1 +
 arch/arm64/kernel/debug-monitors.c      |  5 +++++
 arch/arm64/kernel/entry-common.c        | 22 ++++++++++++++++++++--
 arch/arm64/kernel/kgdb.c                |  2 ++
 4 files changed, 28 insertions(+), 2 deletions(-)

-- 
2.34.1