The patch titled
Subject: docs: sysctl/kernel: add missing bit to panic_print
has been added to the -mm tree. Its filename is
docs-sysctl-kernel-add-missing-bit-to-panic_print.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/docs-sysctl-kernel-add-missing-bit-to-panic_print.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/docs-sysctl-kernel-add-missing-bit-to-panic_print.patch
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------------------------------------------------------
From: "Guilherme G. Piccoli" <gpiccoli@xxxxxxxxxx>
Subject: docs: sysctl/kernel: add missing bit to panic_print
Patch series "Some improvements on panic_print".
This is a mix of a documentation fix with some additions to the
"panic_print" syscall / parameter. The goal here is being able to collect
all CPUs backtraces during a panic event and also to enable "panic_print"
in a kdump event - details of the reasoning and design choices in the
patches.
This patch (of 3):
Commit de6da1e8bcf0 ("panic: add an option to replay all the printk
message in buffer") added a new bit to the sysctl/kernel parameter
"panic_print", but the documentation was added only in
kernel-parameters.txt, not in the sysctl guide.
Fix it here by adding bit 5 to sysctl admin-guide documentation.
Link: https://lkml.kernel.org/r/20211109202848.610874-1-gpiccoli@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20211109202848.610874-2-gpiccoli@xxxxxxxxxx
Fixes: de6da1e8bcf0 ("panic: add an option to replay all the printk message in buffer")
Signed-off-by: Guilherme G. Piccoli <gpiccoli@xxxxxxxxxx>
Reviewed-by: Feng Tang <feng.tang@xxxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Iurii Zaikin <yzaikin@xxxxxxxxxx>
Cc: Samuel Iglesias Gonsalvez <siglesias@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/sysctl/kernel.rst | 1 +
1 file changed, 1 insertion(+)
--- a/Documentation/admin-guide/sysctl/kernel.rst~docs-sysctl-kernel-add-missing-bit-to-panic_print
+++ a/Documentation/admin-guide/sysctl/kernel.rst
@@ -795,6 +795,7 @@ bit 1 print system memory info
bit 2 print timer info
bit 3 print locks info if ``CONFIG_LOCKDEP`` is on
bit 4 print ftrace buffer
+bit 5: print all printk messages in buffer
===== ============================================
So for example to print tasks and memory info on panic, user can::
_
Patches currently in -mm which might be from gpiccoli@xxxxxxxxxx are
docs-sysctl-kernel-add-missing-bit-to-panic_print.patch
panic-add-option-to-dump-all-cpus-backtraces-in-panic_print.patch
panic-allow-printing-extra-panic-information-on-kdump.patch
