kernel/panic: move panic sysctls to its own file

commit 9df918698408fd914493aba0b7858fef50eba63a upstream.

kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.

To help with this maintenance let's start by moving sysctls to places
where they actually belong.  The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we
just care about the core logic.

All filesystem syctls now get reviewed by fs folks. This commit
follows the commit of fs, move the oops_all_cpu_backtrace sysctl to
its own file, kernel/panic.c.

Signed-off-by: tangmeng <tangmeng@uniontech.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/include/linux/panic.h b/include/linux/panic.h
index f5844908a089e53e8f6a23159801dcd4d6422934..e71161da69c4b160216629e269020de2e8bc0b4e 100644 (file)
--- a/include/linux/panic.h
+++ b/include/linux/panic.h
@@ -15,12 +15,6 @@ extern void oops_enter(void);
 extern void oops_exit(void);
 extern bool oops_may_print(void);
 
-#ifdef CONFIG_SMP
-extern unsigned int sysctl_oops_all_cpu_backtrace;
-#else
-#define sysctl_oops_all_cpu_backtrace 0
-#endif /* CONFIG_SMP */
-
 extern int panic_timeout;
 extern unsigned long panic_print;
 extern int panic_on_oops;

diff --git a/kernel/panic.c b/kernel/panic.c
index cefd7d82366fbcd8455abed92f1409fa5c08a974..5ee281b996f9e71f6d5b0166f06dc460e743d537 100644 (file)
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -42,7 +42,9 @@
  * 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;
@@ -71,6 +73,28 @@ 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;

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 34ce5953dbb094dd8ee56f981339a088605fe775..928798f89ca1db415a98e92b31066acd453630e2 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2220,17 +2220,6 @@ static struct ctl_table kern_table[] = {
                .proc_handler   = proc_dointvec,
        },
 #endif
-#ifdef CONFIG_SMP
-       {
-               .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,
-       },
-#endif /* CONFIG_SMP */
        {
                .procname       = "pid_max",
                .data           = &pid_max,