linux-kernel - [PATCH v2 0/2] arm64: Fix pending single-step debugging issues

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Date:   Wed, 13 Apr 2022 12:24:56 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     linux-arm-kernel@...ts.infradead.org, dianders@...omium.org,
        will@...nel.org, liwei391@...wei.com
Cc:     catalin.marinas@....com, mark.rutland@....com, mhiramat@...nel.org,
        daniel.thompson@...aro.org, jason.wessel@...driver.com,
        maz@...nel.org, linux-kernel@...r.kernel.org,
        Sumit Garg <sumit.garg@...aro.org>
Subject: [PATCH v2 0/2] arm64: Fix pending single-step debugging issues

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

Sumit Garg (2):
  arm64: entry: Skip single stepping 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        | 18 +++++++++++++++++-
 arch/arm64/kernel/kgdb.c                |  2 ++
 4 files changed, 25 insertions(+), 1 deletion(-)

-- 
2.25.1