[V3 PATCH 2/2] kexec: Use core_param for crash_kexec_post_notifiers boot option

[Hidehiro Kawai]

crash_kexec_post_notifiers ia a boot option which controls whether
the 1st kernel calls panic notifiers or not before booting the 2nd
kernel.  However, there is no need to limit it to being modifiable
only at boot time.  So, use core_param instead of early_param.

Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez at hitachi.com>
Cc: Dave Young <dyoung at redhat.com>
Cc: Baoquan He <bhe at redhat.com>
Cc: Vivek Goyal <vgoyal at redhat.com>
Cc: Eric Biederman <ebiederm at xmission.com>
Cc: Masami Hiramatsu <mhiramat at kernel.org>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Borislav Petkov <bp at suse.de>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Michal Hocko <mhocko at suse.com>
Cc: Vitaly Kuznetsov <vkuznets at redhat.com>
Cc: Petr Mladek <pmladek at suse.com>
Cc: Tejun Heo <tj at kernel.org>
Cc: Josh Poimboeuf <jpoimboe at redhat.com>
---
 kernel/panic.c |   13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/kernel/panic.c b/kernel/panic.c
index da8062d2..0d0edeb 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -134,6 +134,7 @@ void panic(const char *fmt, ...)
 	long i, i_next = 0;
 	int state = 0;
 	int old_cpu, this_cpu;
+	bool _crash_kexec_post_notifiers = crash_kexec_post_notifiers;
 
 	/*
 	 * Disable local interrupts. This will prevent panic_smp_self_stop
@@ -186,7 +187,7 @@ void panic(const char *fmt, ...)
 	 *
 	 * Bypass the panic_cpu check and call __crash_kexec directly.
 	 */
-	if (!crash_kexec_post_notifiers) {
+	if (!_crash_kexec_post_notifiers) {
 		printk_nmi_flush_on_panic();
 		__crash_kexec(NULL);
 	}
@@ -212,7 +213,7 @@ void panic(const char *fmt, ...)
 	 *
 	 * Bypass the panic_cpu check and call __crash_kexec directly.
 	 */
-	if (crash_kexec_post_notifiers)
+	if (_crash_kexec_post_notifiers)
 		__crash_kexec(NULL);
 
 	bust_spinlocks(0);
@@ -592,13 +593,7 @@ EXPORT_SYMBOL(__stack_chk_fail);
 core_param(panic, panic_timeout, int, 0644);
 core_param(pause_on_oops, pause_on_oops, int, 0644);
 core_param(panic_on_warn, panic_on_warn, int, 0644);
-
-static int __init setup_crash_kexec_post_notifiers(char *s)
-{
-	crash_kexec_post_notifiers = true;
-	return 0;
-}
-early_param("crash_kexec_post_notifiers", setup_crash_kexec_post_notifiers);
+core_param(crash_kexec_post_notifiers, crash_kexec_post_notifiers, bool, 0644);
 
 static int __init oops_setup(char *s)
 {