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