diff options
| author | Jakub Kicinski <kuba@kernel.org> | 2026-02-11 06:51:59 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-02-11 06:52:00 +0300 |
| commit | f2c7fdebf03986cd820028ab933afad670bfe8a2 (patch) | |
| tree | 33b3a4f5f09701f3b08b5661b065e9dc5978c93d /lib | |
| parent | ad1f18e985cb2758c60f644c8fbc92a97bb6d2ba (diff) | |
| parent | 79ba362b43373d19ce6c989b0498f7a67740ff6e (diff) | |
| download | linux-f2c7fdebf03986cd820028ab933afad670bfe8a2.tar.xz | |
Merge branch 'net-netconsole-convert-to-nbcon-console-infrastructure'
Breno Leitao says:
====================
net: netconsole: convert to NBCON console infrastructure
This series adds support for the nbcon (new buffer console) infrastructure
to netconsole, enabling lock-free, priority-based console operations that
are safer in crash scenarios.
The implementation is introduced in three steps:
0) Extend printk to expose CPU and taskname (task->comm) where the
printk originated from. (Thanks John and Petr for the support in
getting this done)
1) Refactor the message fragmentation logic into a reusable helper function
2) Extend nbcon support to non-extended (basic) consoles using the same
infrastructure.
The initial discussion about it appeared a while ago in [1], in order to
solve Mike's HARDIRQ-safe -> HARDIRQ-unsafe lock order warning, and the root
cause is that some hosts were calling IRQ unsafe locks from inside console
lock.
At that time, we didn't have the CON_NBCON_ATOMIC_UNSAFE yet. John
kindly implemented CON_NBCON_ATOMIC_UNSAFE in 187de7c212e5 ("printk:
nbcon: Allow unsafe write_atomic() for panic"), and now we can
implement netconsole on top of nbcon.
Important to note that netconsole continues to call netpoll and the
network TX helpers with interrupt disable, given the TX are called with
target_list_lock.
====================
Link: https://patch.msgid.link/20260206-nbcon-v7-0-62bda69b1b41@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index ba36939fda79..938d967ae3bf 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -35,6 +35,18 @@ config PRINTK_CALLER no option to enable/disable at the kernel command line parameter or sysfs interface. +config PRINTK_EXECUTION_CTX + bool + depends on PRINTK + help + This option extends struct printk_info to include extra execution + context in printk, such as task name and CPU number from where the + message originated. This is useful for correlating printk messages + with specific execution contexts. + + This is automatically enabled when a console driver that supports + execution context is selected. + config STACKTRACE_BUILD_ID bool "Show build ID information in stacktraces" depends on PRINTK |