The patch titled
Subject: kernel/hung_task convert hung_task_panic boot parameter to sysctl
has been added to the -mm tree. Its filename is
kernel-hung_task-convert-hung_task_panic-boot-parameter-to-sysctl.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kernel-hung_task-convert-hung_task_panic-boot-parameter-to-sysctl.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kernel-hung_task-convert-hung_task_panic-boot-parameter-to-sysctl.patch
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------------------------------------------------------
From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: kernel/hung_task convert hung_task_panic boot parameter to sysctl
We can now handle sysctl parameters on kernel command line and have
infrastructure to convert legacy command line options that duplicate
sysctl to become a sysctl alias.
This patch converts the hung_task_panic parameter. Note that the sysctl
handler is more strict and allows only 0 and 1, while the legacy parameter
allowed any non-zero value. But there is little reason anyone would not
be using 1.
Link: http://lkml.kernel.org/r/20200427180433.7029-4-vbabka@xxxxxxx
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Christian Brauner <christian.brauner@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: "Eric W . Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Guilherme G . Piccoli" <gpiccoli@xxxxxxxxxxxxx>
Cc: Iurii Zaikin <yzaikin@xxxxxxxxxx>
Cc: Ivan Teterevkov <ivan.teterevkov@xxxxxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/kernel-parameters.txt | 2 +-
fs/proc/proc_sysctl.c | 1 +
kernel/hung_task.c | 10 ----------
3 files changed, 2 insertions(+), 11 deletions(-)
--- a/Documentation/admin-guide/kernel-parameters.txt~kernel-hung_task-convert-hung_task_panic-boot-parameter-to-sysctl
+++ a/Documentation/admin-guide/kernel-parameters.txt
@@ -1505,7 +1505,7 @@
[KNL] Should the hung task detector generate panics.
Format: <integer>
- A nonzero value instructs the kernel to panic when a
+ A value of 1 instructs the kernel to panic when a
hung task is detected. The default value is controlled
by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
option. The value selected by this boot parameter can
--- a/fs/proc/proc_sysctl.c~kernel-hung_task-convert-hung_task_panic-boot-parameter-to-sysctl
+++ a/fs/proc/proc_sysctl.c
@@ -1710,6 +1710,7 @@ struct sysctl_alias {
*/
static const struct sysctl_alias sysctl_aliases[] = {
{"numa_zonelist_order", "vm.numa_zonelist_order" },
+ {"hung_task_panic", "kernel.hung_task_panic" },
{ }
};
--- a/kernel/hung_task.c~kernel-hung_task-convert-hung_task_panic-boot-parameter-to-sysctl
+++ a/kernel/hung_task.c
@@ -63,16 +63,6 @@ static struct task_struct *watchdog_task
unsigned int __read_mostly sysctl_hung_task_panic =
CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE;
-static int __init hung_task_panic_setup(char *str)
-{
- int rc = kstrtouint(str, 0, &sysctl_hung_task_panic);
-
- if (rc)
- return rc;
- return 1;
-}
-__setup("hung_task_panic=", hung_task_panic_setup);
-
static int
hung_task_panic(struct notifier_block *this, unsigned long event, void *ptr)
{
_
Patches currently in -mm which might be from vbabka@xxxxxxx are
usercopy-mark-dma-kmalloc-caches-as-usercopy-caches.patch
mm-dump_page-do-not-crash-with-invalid-mapping-pointer.patch
kernel-sysctl-support-setting-sysctl-parameters-from-kernel-command-line.patch
kernel-sysctl-support-handling-command-line-aliases.patch
kernel-hung_task-convert-hung_task_panic-boot-parameter-to-sysctl.patch
tools-testing-selftests-sysctl-sysctlsh-support-config_test_sysctl=y.patch
lib-test_sysctl-support-testing-of-sysctl-boot-parameter.patch
