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Message-ID: <aS2--eKoBSOo8Zek@pathway.suse.cz>
Date: Mon, 1 Dec 2025 17:14:49 +0100
From: Petr Mladek <pmladek@...e.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>,
Steven Rostedt <rostedt@...dmis.org>,
John Ogness <john.ogness@...utronix.de>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Peter Zijlstra <peterz@...radead.org>,
Petr Mladek <pmladek@...e.com>, linux-kernel@...r.kernel.org
Subject: [GIT PULL] printk for 6.19
Hi Linus,
please pull the latest printk changes from
git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git tags/printk-for-6.19
==================================================
- Allow to create nbcon console drivers with an unsafe write_atomic()
callback. It can be called only by the final nbcon_atomic_flush_unsafe().
Otherwise, the driver would rely on the kthread.
It is going to be used as the-best-effort approach for an experimental
nbcon netconsole driver, see
https://lore.kernel.org/r/20251121-nbcon-v1-2-503d17b2b4af@debian.org
Note that a safe .write_atomic() callback is supposed to work in
NMI context. But some networking drivers are not safe even in IRQ
context, see
https://lore.kernel.org/r/oc46gdpmmlly5o44obvmoatfqo5bhpgv7pabpvb6sjuqioymcg@gjsma3ghoz35
In the ideal world, all networking drivers were fixed first and
the atomic flush would be blocked only in NMI context. But it
brings the question how reliable are networking drivers when
the system is in a bad state. They might block flushing more
reliable serial consoles which are more suitable for serious
debugging anyway.
- Allow to use the last 4 bytes of the printk ring buffer.
- Prevent queuing IRQ work and block printk kthreads when
consoles are suspended. Otherwise, they create non-necessary
churn or even block the suspend.
- Release console_lock() between each record in the kthread used
for legacy consoles on RT. It might significantly speed up
the boot.
- Release nbcon context between each record in the atomic flush.
It prevents stalls of the related printk kthread after it has
lost the ownership in the middle of a record.
- Add support for NBCON consoles into KDB.
- Add %ptsP modifier for printing struct timespec64 and use it
where possible.
- Misc code clean up.
----------------------------------------------------------------
Andrew Murray (2):
printk: Introduce console_flush_one_record
printk: Use console_flush_one_record for legacy printer kthread
Andy Shevchenko (24):
lib/vsprintf: Check pointer before dereferencing in time_and_date()
lib/vsprintf: Deduplicate special hex number specifier data
lib/vsprintf: Add specifier for printing struct timespec64
ceph: Switch to use %ptSp
libceph: Switch to use %ptSp
dma-buf: Switch to use %ptSp
drm/amdgpu: Switch to use %ptSp
drm/msm: Switch to use %ptSp
drm/vblank: Switch to use %ptSp
drm/xe: Switch to use %ptSp
e1000e: Switch to use %ptSp
igb: Switch to use %ptSp
ipmi: Switch to use %ptSp
media: av7110: Switch to use %ptSp
mmc: mmc_test: Switch to use %ptSp
net: dsa: sja1105: Switch to use %ptSp
PCI: epf-test: Switch to use %ptSp
pps: Switch to use %ptSp
ptp: ocp: Switch to use %ptSp
s390/dasd: Switch to use %ptSp
scsi: fnic: Switch to use %ptSp
scsi: snic: Switch to use %ptSp
tracing: Switch to use %ptSp
lib/vsprintf: Unify FORMAT_STATE_NUM handlers
Daniil Tatianin (1):
printk_ringbuffer: don't needlessly wrap data blocks around
John Ogness (4):
printk: nbcon: Allow unsafe write_atomic() for panic
printk: Allow printk_trigger_flush() to flush all types
printk: Avoid scheduling irq_work on suspend
printk: Avoid irq_work for printk_deferred() on suspend
Lukas Bulwahn (1):
MAINTAINERS: add printk core-api doc file to PRINTK
Marcos Paulo de Souza (8):
printk: nbcon: Export console_is_usable
printk: nbcon: Introduce KDB helpers
printk: nbcon: Allow KDB to acquire the NBCON context
printk: nbcon: Export nbcon_write_context_set_buf
kdb: Adapt kdb_msg_write to work with NBCON consoles
drivers: serial: kgdboc: Drop checks for CON_ENABLED and CON_BOOT
arch: um: kmsg_dump: Use console_is_usable
printk: Use console_is_usable on console_unblank
Oleg Nesterov (1):
printk_legacy_map: use LD_WAIT_CONFIG instead of LD_WAIT_SLEEP
Petr Mladek (13):
printk: console_flush_one_record() code cleanup
printk/nbcon: Block printk kthreads when any CPU is in an emergency context
printk/nbcon/panic: Allow printk kthread to sleep when the system is in panic
printk/nbcon: Release nbcon consoles ownership in atomic flush after each emitted record
printk_ringbuffer: Fix check of valid data size when blk_lpos overflows
printk_ringbuffer: Create a helper function to decide whether more space is needed
Merge branch 'for-6.19-vsprintf-timespec64' into for-linus
Merge branch 'rework/atomic-flush-hardlockup' into for-linus
Merge branch 'rework/nbcon-in-kdb' into for-linus
Merge branch 'rework/preempt-legacy-kthread' into for-linus
Merge branch 'rework/suspend-fixes' into for-linus
Merge branch 'rework/threaded-printk' into for-linus
Merge branch 'rework/write_atomic-unsafe' into for-linus
Thorsten Blum (1):
lib/vsprintf: Improve vsprintf + sprintf function comments
Documentation/core-api/printk-formats.rst | 11 +-
MAINTAINERS | 1 +
arch/um/kernel/kmsg_dump.c | 2 +-
drivers/char/ipmi/ipmi_si_intf.c | 3 +-
drivers/char/ipmi/ipmi_ssif.c | 6 +-
drivers/dma-buf/sync_debug.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c | 3 +-
drivers/gpu/drm/drm_vblank.c | 6 +-
drivers/gpu/drm/msm/disp/msm_disp_snapshot_util.c | 3 +-
drivers/gpu/drm/msm/msm_gpu.c | 3 +-
drivers/gpu/drm/xe/xe_devcoredump.c | 4 +-
drivers/mmc/core/mmc_test.c | 20 +-
drivers/net/dsa/sja1105/sja1105_tas.c | 8 +-
drivers/net/ethernet/intel/e1000e/ptp.c | 7 +-
drivers/net/ethernet/intel/igb/igb_ptp.c | 7 +-
drivers/pci/endpoint/functions/pci-epf-test.c | 5 +-
drivers/pps/generators/pps_gen_parport.c | 3 +-
drivers/pps/kapi.c | 3 +-
drivers/ptp/ptp_ocp.c | 13 +-
drivers/s390/block/dasd.c | 3 +-
drivers/scsi/fnic/fnic_trace.c | 55 ++--
drivers/scsi/snic/snic_debugfs.c | 10 +-
drivers/scsi/snic/snic_trc.c | 5 +-
drivers/staging/media/av7110/av7110.c | 2 +-
drivers/tty/serial/kgdboc.c | 1 -
fs/ceph/dir.c | 5 +-
fs/ceph/inode.c | 49 ++--
fs/ceph/xattr.c | 6 +-
include/linux/console.h | 68 +++++
include/linux/kdb.h | 16 ++
kernel/debug/kdb/kdb_io.c | 47 ++--
kernel/printk/internal.h | 53 +---
kernel/printk/nbcon.c | 174 ++++++++++--
kernel/printk/printk.c | 306 ++++++++++++++--------
kernel/printk/printk_ringbuffer.c | 67 ++++-
kernel/trace/trace_output.c | 6 +-
lib/tests/printf_kunit.c | 4 +
lib/vsprintf.c | 80 +++---
net/ceph/messenger_v2.c | 6 +-
39 files changed, 682 insertions(+), 391 deletions(-)
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