linux-kernel - [PATCH 0/9] panic: introduce panic status function family

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Message-ID: <20250820091702.512524-1-wangjinchao600@gmail.com>
Date: Wed, 20 Aug 2025 17:14:45 +0800
From: Jinchao Wang <wangjinchao600@...il.com>
To: pmladek@...e.com,
	akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org,
	feng.tang@...ux.alibaba.com,
	joel.granados@...nel.org,
	john.ogness@...utronix.de,
	wangjinchao600@...il.com,
	namcao@...utronix.de,
	sravankumarlpu@...il.com
Subject: [PATCH 0/9] panic: introduce panic status function family

This series introduces a family of helper functions
to manage panic state and updates existing code to
use them.

Before this series, panic state helpers were
scattered and inconsistent. For example,
panic_in_progress() was defined in printk/printk.c,
not in panic.c or panic.h. As a result, developers
had to look in unexpected places to understand or
re-use panic state logic. Other checks were open-
coded, duplicating logic across panic, crash, and
watchdog paths.

The new helpers centralize the functionality in
panic.c/panic.h:
  - panic_try_start()
  - panic_reset()
  - panic_in_progress()
  - panic_on_this_cpu()
  - panic_on_other_cpu()

Patches 1–8 add the helpers and convert panic/crash
and printk/nbcon code to use them.

Patch 9 fixes a bug in the watchdog subsystem by
skipping checks when a panic is in progress, avoiding
interference with the panic CPU.

Together, this makes panic state handling simpler,
more discoverable, and more robust.

Jinchao Wang (9):
  panic: Introduce helper functions for panic state
  fbdev: Use panic_in_progress() helper
  crash_core: use panic_try_start() in crash_kexec()
  panic: use panic_try_start() in nmi_panic()
  panic: use panic_try_start() in vpanic()
  printk/nbcon: use panic_on_this_cpu() helper
  panic/printk: replace this_cpu_in_panic() with panic_on_this_cpu()
  panic/printk: replace other_cpu_in_panic() with panic_on_other_cpu()
  watchdog: skip checks when panic is in progress

 drivers/video/fbdev/core/fbcon.c  |  9 +---
 include/linux/panic.h             |  6 +++
 include/linux/printk.h            |  2 -
 kernel/crash_core.c               | 15 ++-----
 kernel/panic.c                    | 71 +++++++++++++++++++++++++------
 kernel/printk/internal.h          |  1 -
 kernel/printk/nbcon.c             | 14 +++---
 kernel/printk/printk.c            | 37 +++-------------
 kernel/printk/printk_ringbuffer.c |  2 +-
 kernel/watchdog_buddy.c           |  5 +++
 kernel/watchdog_perf.c            |  3 ++
 lib/dump_stack.c                  |  2 +-
 12 files changed, 89 insertions(+), 78 deletions(-)

-- 
2.43.0