Masami Hiramatsu (Google) a494d3c8d5 ring-buffer: Flush and stop persistent ring buffer on panic ...

On real hardware, panic and machine reboot may not flush hardware cache
to memory. This means the persistent ring buffer, which relies on a
coherent state of memory, may not have its events written to the buffer
and they may be lost. Moreover, there may be inconsistency with the
counters which are used for validation of the integrity of the
persistent ring buffer which may cause all data to be discarded.

To avoid this issue, stop recording of the ring buffer on panic and
flush the cache of the ring buffer's memory.

Fixes: e645535a95 ("tracing: Add option to use memmapped memory for trace boot instance")
Cc: stable@vger.kernel.org
Cc: Will Deacon <will@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Ian Rogers <irogers@google.com>
Link: https://patch.msgid.link/177751969602.2136606.12031934362587643488.stgit@mhiramat.tok.corp.google.com
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2026-05-21 08:20:58 -04:00

..

68000

m68k: Fix task info flags handling for 68000

2026-04-06 08:46:14 +10:00

amiga

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

apollo

m68k: remove unneeded tty includes

2025-06-17 13:42:33 +02:00

atari

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-21 17:09:51 -08:00

bvme6000

m68k: Replace GPL 2.0+ README.legal boilerplate with SPDX

2023-10-06 10:03:04 +02:00

coldfire

m68k: coldfire: remove creating a fixed phy

2025-11-04 18:46:13 -08:00

configs

Merge tag 'm68k-for-v7.1-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k

2026-04-16 08:11:01 -07:00

emu

m68k: emu: Replace unbounded sprintf() in nfhd_init_one()

2026-04-08 11:15:21 +02:00

fpsp040

m68k: fpsp040: Fix indentation by 5 spaces

2023-10-16 14:30:40 +02:00

hp300

serial: 8250: Move hp300_setup_serial_console() to <linux/serial_8250.h>

2024-01-27 19:01:39 -08:00

ifpsp060

m68k: Replace GPL 2.0+ README.legal boilerplate with SPDX

2023-10-06 10:03:04 +02:00

include

ring-buffer: Flush and stop persistent ring buffer on panic

2026-05-21 08:20:58 -04:00

kernel

Merge tag 'pci-v7.1-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci

2026-04-15 14:41:21 -07:00

lib

m68k: nommu: fix memmove() with differently aligned src and dest for 68000

2026-01-27 12:38:52 +10:00

mac

Merge tag 'm68k-for-v6.17-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k

2025-07-29 20:19:47 -07:00

math-emu

m68k: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers

2025-07-06 12:50:50 +02:00

mm

arch, mm: consolidate empty_zero_page

2026-04-05 13:53:01 -07:00

mvme16x

m68k: mvme147, mvme16x: Adopt rtc-m48t59 platform driver

2024-11-22 20:59:40 +01:00

mvme147

Merge tag 'rtc-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

2024-11-30 11:18:16 -08:00

q40

m68k: q40: Remove commented out code

2026-03-30 13:47:32 +02:00

sun3

m68k: sun3: Replace vsprintf() with bounded vsnprintf()

2026-01-26 12:26:01 +01:00

sun3x

m68k: sun3/3x: Add and use "sun3.h"

2023-10-06 10:03:04 +02:00

tools/amiga

…

virt

m68k: virt: Switch to qemu-virt-ctrl driver

2026-04-13 12:16:10 +02:00

install.sh

kbuild: Abort make on install failures

2024-07-20 13:34:54 +09:00

Kbuild

…

Kconfig

m68k: Enable dead code elimination

2025-07-06 12:50:50 +02:00

Kconfig.bus

m68k: coldfire: drop ISA_DMA_API support

2022-05-16 13:18:30 +10:00

Kconfig.cpu

m68k: Select M68020 as fallback for classic

2024-11-06 15:10:14 +01:00

Kconfig.debug

m68k: Don't unregister boot console needlessly

2025-07-06 12:50:50 +02:00

Kconfig.devices

m68k: /proc/hardware should depend on PROC_FS

2023-02-13 11:34:49 +01:00

Kconfig.machine

m68k: virt: Switch to qemu-virt-ctrl driver

2026-04-13 12:16:10 +02:00

Makefile

kbuild: use 4-space indentation when followed by conditionals

2024-02-15 06:05:44 +09:00