kernel/linux.git/include/linux/kdb.h, branch v7.0-rc7

kernel: debug: Add SPDX license ids to kdb files

2026-01-27T14:57:20+00:00

Add GPL-2.0 license id to some files related to kdb and kgdb, replacing references to GPL or COPYING. These files were introduced into the kernel in 2008 and 2010. Signed-off-by: Tim Bird Signed-off-by: Greg Kroah-Hartman

printk: nbcon: Allow KDB to acquire the NBCON context

2025-10-24T10:55:10+00:00

KDB can interrupt any console to execute the "mirrored printing" at any time, so add an exception to nbcon_context_try_acquire_direct to allow to get the context if the current CPU is the same as kdb_printf_cpu. This change will be necessary for the next patch, which fixes kdb_msg_write to work with NBCON consoles by calling ->write_atomic on such consoles. But to print it first needs to acquire the ownership of the console, so nbcon_context_try_acquire_direct is fixed here. Reviewed-by: John Ogness Signed-off-by: Marcos Paulo de Souza Reviewed-by: Petr Mladek Link: https://patch.msgid.link/20251016-nbcon-kgdboc-v6-3-866aac60a80e@suse.com [pmladek@suse.com: Fix compilation with !CONFIG_KGDB_KDB.] Signed-off-by: Petr Mladek

kdb: remove usage of static environment buffer

2025-03-28T21:10:53+00:00

Problem: The set environment variable logic uses a static "heap" like buffer to store the values of the variables, and they are never freed, on top of that this is redundant since the kernel supplies allocation facilities which are even used also in this file. Solution: Remove the weird static buffer logic and use kmalloc instead, call kfree when overriding an existing variable. Signed-off-by: Nir Lichtman Reviewed-by: Douglas Anderson Link: https://lore.kernel.org/r/20250204054741.GB1219827@lichtman.org Signed-off-by: Daniel Thompson

kdb: Remove unused flags stack

2025-01-25T08:22:26+00:00

kdb_restore_flags() and kdb_save_flags() were added in 2010 by commit 5d5314d6795f ("kdb: core for kgdb back end (1 of 2)") but have remained unused. Remove them, and their associated storage. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Douglas Anderson Link: https://lore.kernel.org/r/20250112012049.319515-1-linux@treblig.org Signed-off-by: Daniel Thompson (RISCstar)

kdb: move kdb_send_sig() declaration to a better header file

2023-07-03T08:27:12+00:00

kdb_send_sig() is defined in the signal code and called from kdb, but the declaration is part of the kdb internal code. Move the declaration to the shared header to avoid the warning: kernel/signal.c:4789:6: error: no previous prototype for 'kdb_send_sig' [-Werror=missing-prototypes] Reported-by: Arnd Bergmann Closes: https://lore.kernel.org/lkml/20230517125423.930967-1-arnd@kernel.org/ Signed-off-by: Daniel Thompson Link: https://lore.kernel.org/r/20230630201206.2396930-1-daniel.thompson@linaro.org

module: Move kdb module related code out of main kdb code

2022-04-05T15:43:04+00:00

No functional change. This patch migrates the kdb 'lsmod' command support out of main kdb code into its own file under kernel/module. In addition to the above, a minor style warning i.e. missing a blank line after declarations, was resolved too. The new file was added to MAINTAINERS. Finally we remove linux/module.h as it is entirely redundant. Reviewed-by: Daniel Thompson Acked-by: Daniel Thompson Signed-off-by: Aaron Tomlin Signed-off-by: Luis Chamberlain

kdb: Rename members of struct kdbtab_t

2021-07-27T16:05:06+00:00

Remove redundant prefix "cmd_" from name of members in struct kdbtab_t for better readibility. Suggested-by: Doug Anderson Signed-off-by: Sumit Garg Reviewed-by: Douglas Anderson Link: https://lore.kernel.org/r/20210712134620.276667-5-sumit.garg@linaro.org Signed-off-by: Daniel Thompson

kdb: Get rid of redundant kdb_register_flags()

2021-07-27T16:03:16+00:00

Commit e4f291b3f7bb ("kdb: Simplify kdb commands registration") allowed registration of pre-allocated kdb commands with pointer to struct kdbtab_t. Lets switch other users as well to register pre- allocated kdb commands via: - Changing prototype for kdb_register() to pass a pointer to struct kdbtab_t instead. - Embed kdbtab_t structure in kdb_macro_t rather than individual params. With these changes kdb_register_flags() becomes redundant and hence removed. Also, since we have switched all users to register pre-allocated commands, "is_dynamic" flag in struct kdbtab_t becomes redundant and hence removed as well. Suggested-by: Daniel Thompson Signed-off-by: Sumit Garg Acked-by: Steven Rostedt (VMware) Reviewed-by: Douglas Anderson Link: https://lore.kernel.org/r/20210712134620.276667-3-sumit.garg@linaro.org Signed-off-by: Daniel Thompson

kdb: Remove the misfeature 'KDBFLAGS'

2020-06-02T14:15:46+00:00

Currently, 'KDBFLAGS' is an internal variable of kdb, it is combined by 'KDBDEBUG' and state flags. It will be shown only when 'KDBDEBUG' is set, and the user can define an environment variable named 'KDBFLAGS' too. These are puzzling indeed. After communication with Daniel, it seems that 'KDBFLAGS' is a misfeature. So let's replace 'KDBFLAGS' with 'KDBDEBUG' to just show the value we wrote into. After this modification, we can use `md4c1 kdb_flags` instead, to observe the state flags. Suggested-by: Daniel Thompson Signed-off-by: Wei Li Link: https://lore.kernel.org/r/20200521072125.21103-1-liwei391@huawei.com [daniel.thompson@linaro.org: Make kdb_flags unsigned to avoid arithmetic right shift] Signed-off-by: Daniel Thompson

kdb: kdb_current_regs should be private

2020-01-31T17:33:54+00:00

As of the patch ("MIPS: kdb: Remove old workaround for backtracing on other CPUs") there is no reason for kdb_current_regs to be in the public "kdb.h". Let's move it next to kdb_current_task. Signed-off-by: Douglas Anderson Link: https://lore.kernel.org/r/20191109111623.2.Iadbfb484e90b557cc4b5ac9890bfca732cd99d77@changeid Signed-off-by: Daniel Thompson