[PATCH 0/2] printk: Introduce loglevel bypass for pstore console

[Tzung-Bi Shih <tzungbi@kernel.org>]

Currently, offline consoles (e.g., pstore_console backed by ramoops)
inherit the system's global console_loglevel.

In production environments, physical serial consoles (UARTs) are often
heavily rate-limited to prevent verbose messages from causing severe
execution bottlenecks.  Unfortunately, this identically silences the
pstore console.  When a kernel panic or lockup occurs, engineers are
left inspecting a crash dump that has been stripped of the verbose logs
that could have identified the root cause.

This series introduces CON_BYPASS_LOGLEVEL, a simple flag that allows
specialized offline consoles to request unsuppressed logs directly.

Patch 1 introduces the CON_BYPASS_LOGLEVEL flag.
Patch 2 adopts the flag in pstore_console.

Tzung-Bi Shih (2):
  printk: Introduce CON_BYPASS_LOGLEVEL flag
  pstore: Bypass loglevel suppression for pstore console

 fs/pstore/platform.c    | 4 ++++
 fs/pstore/ram.c         | 3 ++-
 include/linux/console.h | 4 ++++
 include/linux/pstore.h  | 2 ++
 kernel/printk/nbcon.c   | 7 +++++--
 kernel/printk/printk.c  | 6 ++++--
 6 files changed, 21 insertions(+), 5 deletions(-)

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2.55.0.897.gb25b4bd76c-goog