Merge tag 'sysctl-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof...

[linux-block.git] / kernel / panic.c

diff --git a/kernel/panic.c b/kernel/panic.c
index 6737b23322753a2c89954a98ef4e6038fc09b3a1..a3c758dba15ab68c3d43069797ba462f60cfa6e8 100644 (file)
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -43,7 +43,9 @@
  * Should we dump all CPUs backtraces in an oops event?
  * Defaults to 0, can be changed via sysctl.
  */
-unsigned int __read_mostly sysctl_oops_all_cpu_backtrace;
+static unsigned int __read_mostly sysctl_oops_all_cpu_backtrace;
+#else
+#define sysctl_oops_all_cpu_backtrace 0
 #endif /* CONFIG_SMP */
 
 int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE;
@@ -73,6 +75,28 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
 
 EXPORT_SYMBOL(panic_notifier_list);
 
+#if defined(CONFIG_SMP) && defined(CONFIG_SYSCTL)
+static struct ctl_table kern_panic_table[] = {
+       {
+               .procname       = "oops_all_cpu_backtrace",
+               .data           = &sysctl_oops_all_cpu_backtrace,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = SYSCTL_ZERO,
+               .extra2         = SYSCTL_ONE,
+       },
+       { }
+};
+
+static __init int kernel_panic_sysctls_init(void)
+{
+       register_sysctl_init("kernel", kern_panic_table);
+       return 0;
+}
+late_initcall(kernel_panic_sysctls_init);
+#endif
+
 static long no_blink(int state)
 {
        return 0;