[PATCH v2 0/2] printk: Add force_con printk flag to not suppress sysrq header msgs

[Marcos Paulo de Souza <mpdesouza@suse.com>]

Hello,

This is the second version of the patchset. It now addresses comments
from John and Petr, while also mentioning that the current work solves
one issue on handle_sysrq when the printk messages are deferred.

The original cover-letter in is the v1.

Please review!

Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
---
Changes in v2:
- Mentioned that it fixes a bug related to loglevel= dance (suggested by John)
- Changed to loud_con to FORCE_CON (John, Petr)
- Don't skip printk delay if FORCE_CON is specified (John)
- Set FORCE_CON when LOG_CONT is handled (John)
- Changed force_con from a per-CPU variable to a global variable because
  we can't disable migration on the callsites. (John, Petr)
- Used is_printk_force_console() on boot_delay_msec(), since it's used
  when the message is stored, instead of setting is as an argument.
- Link to v1: https://lore.kernel.org/r/20241016-printk-loud-con-v1-0-065e4dad6632@suse.com

---
Marcos Paulo de Souza (2):
      printk: Introduce FORCE_CON flag
      tty: sysrq: Use printk_force_console context on __handle_sysrq

 drivers/tty/sysrq.c         | 18 ++++++++----------
 include/linux/printk.h      |  3 +++
 kernel/printk/internal.h    |  3 +++
 kernel/printk/printk.c      | 21 ++++++++++++++++-----
 kernel/printk/printk_safe.c | 18 ++++++++++++++++++
 5 files changed, 48 insertions(+), 15 deletions(-)
---
base-commit: d9f4b813ae5c9bcdc9fcbaa1f4c9829bdc272532
change-id: 20241016-printk-loud-con-03b393d5f6fb

Best regards,
-- 
Marcos Paulo de Souza <mpdesouza@suse.com>