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Date: Fri, 1 Apr 2022 16:23:00 -0400 From: Alejandro Jimenez <alejandro.j.jimenez@...cle.com> To: corbet@....net, mcgrof@...nel.org, keescook@...omium.org, yzaikin@...gle.com, linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org Cc: akpm@...ux-foundation.org, linux@...musvillemoes.dk, ebiggers@...gle.com, peterz@...radead.org, ying.huang@...el.com, gpiccoli@...lia.com, mchehab+huawei@...nel.org, Jason@...c4.com, daniel@...earbox.net, robh@...nel.org, wangqing@...o.com, prestwoj@...il.com, dsahern@...nel.org, stephen.s.brennan@...cle.com, alejandro.j.jimenez@...cle.com Subject: [RFC 1/1] kernel/sysctl: Add sysctl entry for crash_kexec_post_notifiers Introduce a new sysctl: /proc/sys/kernel/crash_kexec_post_notifiers that allows the crash_kexec_post_notifiers tunable to be listed, read, and modified via sysctl(8) at runtime. crash_kexec_post_notifiers can now be set via sysctl: # sysctl -w kernel.crash_kexec_post_notifiers=1 or using the sysfs entry: # echo 0 > /sys/module/kernel/parameters/crash_kexec_post_notifiers which is also available for other core kernel parameters like panic, panic_print, and panic_on_warn. Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@...cle.com> Reviewed-by: Stephen Brennan <stephen.s.brennan@...cle.com> --- Documentation/admin-guide/sysctl/kernel.rst | 8 ++++++++ include/uapi/linux/sysctl.h | 1 + kernel/sysctl.c | 7 +++++++ 3 files changed, 16 insertions(+) diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index 1144ea3229a3..8e07121e2a58 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -213,6 +213,14 @@ If `core_pattern`_ does not include "%p" (default does not) and ``core_uses_pid`` is set, then .PID will be appended to the filename. +crash_kexec_post_notifiers +============ + +Allow the callbacks in panic notifier list to be called before kdump and dumping +kmsg. + +0 Do not call panic notifier list callbacks before kdump (default). +1 Call panic notifier list callbacks before kdump. ctrl-alt-del ============ diff --git a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h index 6a3b194c50fe..921e3ea01881 100644 --- a/include/uapi/linux/sysctl.h +++ b/include/uapi/linux/sysctl.h @@ -154,6 +154,7 @@ enum KERN_PANIC_ON_NMI=76, /* int: whether we will panic on an unrecovered */ KERN_PANIC_ON_WARN=77, /* int: call panic() in WARN() functions */ KERN_PANIC_PRINT=78, /* ulong: bitmask to print system info on panic */ + KERN_CRASH_KEXEC_POST_NOTIFIERS=79, /* bool: call panic notifier list before kdump */ }; diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 830aaf8ca08e..8e0be72b5fba 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -2339,6 +2339,13 @@ static struct ctl_table kern_table[] = { .extra2 = SYSCTL_INT_MAX, }, #endif + { + .procname = "crash_kexec_post_notifiers", + .data = &crash_kexec_post_notifiers, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dobool, + }, { } }; -- 2.34.1
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