Re: [PATCH 20/30] panic: Add the panic informational notifier list

---
 arch/arm64/kernel/setup.c                         | 2 +-
 arch/mips/kernel/relocate.c                       | 2 +-
 arch/powerpc/kernel/setup-common.c                | 2 +-
 arch/x86/kernel/setup.c                           | 2 +-
 drivers/bus/brcmstb_gisb.c                        | 2 +-
 drivers/hwtracing/coresight/coresight-cpu-debug.c | 4 ++--
 drivers/soc/tegra/ari-tegra186.c                  | 3 ++-
 include/linux/panic_notifier.h                    | 1 +
 kernel/hung_task.c                                | 3 ++-
 kernel/panic.c                                    | 4 ++++
 kernel/rcu/tree.c                                 | 1 -
 kernel/rcu/tree_stall.h                           | 3 ++-
 kernel/trace/trace.c                              | 2 +-
 13 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 3505789cf4bd..ac2c7e8c9c6a 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c

@@ -444,7 +444,7 @@ static struct notifier_block arm64_panic_block = {
 
 static int __init register_arm64_panic_block(void)
 {
-	atomic_notifier_chain_register(&panic_notifier_list,
+	atomic_notifier_chain_register(&panic_info_list,
 				       &arm64_panic_block);
 	return 0;
 }

diff --git a/arch/mips/kernel/relocate.c b/arch/mips/kernel/relocate.c
index 56b51de2dc51..650811f2436a 100644
--- a/arch/mips/kernel/relocate.c
+++ b/arch/mips/kernel/relocate.c

@@ -459,7 +459,7 @@ static struct notifier_block kernel_location_notifier = {
 
 static int __init register_kernel_offset_dumper(void)
 {
-	atomic_notifier_chain_register(&panic_notifier_list,
+	atomic_notifier_chain_register(&panic_info_list,
 				       &kernel_location_notifier);
 	return 0;
 }

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 1468c3937bf4..d04b8bf8dbc7 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c

@@ -757,7 +757,7 @@ void __init setup_panic(void)
 				       &ppc_fadump_block);
 
 	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
-		atomic_notifier_chain_register(&panic_notifier_list,
+		atomic_notifier_chain_register(&panic_info_list,
 					       &kernel_offset_notifier);
 
 	/* Low-level platform-specific routines that should run on panic */

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index c95b9ac5a457..599b25346964 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c

@@ -1266,7 +1266,7 @@ static struct notifier_block kernel_offset_notifier = {
 
 static int __init register_kernel_offset_dumper(void)
 {
-	atomic_notifier_chain_register(&panic_notifier_list,
+	atomic_notifier_chain_register(&panic_info_list,
 					&kernel_offset_notifier);
 	return 0;
 }

diff --git a/drivers/bus/brcmstb_gisb.c b/drivers/bus/brcmstb_gisb.c
index 1ea7b015e225..c64e087fba7a 100644
--- a/drivers/bus/brcmstb_gisb.c
+++ b/drivers/bus/brcmstb_gisb.c

@@ -486,7 +486,7 @@ static int __init brcmstb_gisb_arb_probe(struct platform_device *pdev)
 
 	if (list_is_singular(&brcmstb_gisb_arb_device_list)) {
 		register_die_notifier(&gisb_die_notifier);
-		atomic_notifier_chain_register(&panic_notifier_list,
+		atomic_notifier_chain_register(&panic_info_list,
 					       &gisb_panic_notifier);
 	}
 

diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c b/drivers/hwtracing/coresight/coresight-cpu-debug.c
index 1874df7c6a73..7b1012454525 100644
--- a/drivers/hwtracing/coresight/coresight-cpu-debug.c
+++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c

@@ -535,7 +535,7 @@ static int debug_func_init(void)
 			    &debug_func_knob_fops);
 
 	/* Register function to be called for panic */
-	ret = atomic_notifier_chain_register(&panic_notifier_list,
+	ret = atomic_notifier_chain_register(&panic_info_list,
 					     &debug_notifier);
 	if (ret) {
 		pr_err("%s: unable to register notifier: %d\n",

@@ -552,7 +552,7 @@ static int debug_func_init(void)
 
 static void debug_func_exit(void)
 {
-	atomic_notifier_chain_unregister(&panic_notifier_list,
+	atomic_notifier_chain_unregister(&panic_info_list,
 					 &debug_notifier);
 	debugfs_remove_recursive(debug_debugfs_dir);
 }

diff --git a/drivers/soc/tegra/ari-tegra186.c b/drivers/soc/tegra/ari-tegra186.c
index 02577853ec49..4ef05ebed739 100644
--- a/drivers/soc/tegra/ari-tegra186.c
+++ b/drivers/soc/tegra/ari-tegra186.c

@@ -73,7 +73,8 @@ static struct notifier_block tegra186_ari_panic_nb = {
 static int __init tegra186_ari_init(void)
 {
 	if (of_machine_is_compatible("nvidia,tegra186"))
-		atomic_notifier_chain_register(&panic_notifier_list, &tegra186_ari_panic_nb);
+		atomic_notifier_chain_register(&panic_info_list,
+					       &tegra186_ari_panic_nb);
 
 	return 0;
 }

diff --git a/include/linux/panic_notifier.h b/include/linux/panic_notifier.h
index 0bb9dc0dea04..7364a346bcb0 100644
--- a/include/linux/panic_notifier.h
+++ b/include/linux/panic_notifier.h

@@ -7,6 +7,7 @@
 
 extern struct atomic_notifier_head panic_notifier_list;
 extern struct atomic_notifier_head panic_hypervisor_list;
+extern struct atomic_notifier_head panic_info_list;
 
 extern bool crash_kexec_post_notifiers;
 

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 52501e5f7655..1b2d7111d5ac 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c

@@ -85,6 +85,7 @@ hung_task_panic(struct notifier_block *this, unsigned long event, void *ptr)
 
 static struct notifier_block panic_block = {
 	.notifier_call = hung_task_panic,
+	.priority = INT_MAX, /* run early to prevent potential log flood */
 };
 
 static void check_hung_task(struct task_struct *t, unsigned long timeout)

@@ -378,7 +379,7 @@ static int watchdog(void *dummy)
 
 static int __init hung_task_init(void)
 {
-	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
+	atomic_notifier_chain_register(&panic_info_list, &panic_block);
 
 	/* Disable hung task detector on suspend */
 	pm_notifier(hungtask_pm_notify, 0);

diff --git a/kernel/panic.c b/kernel/panic.c
index ef76f3f9c44d..73ca1bc44e30 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c

@@ -76,6 +76,9 @@ EXPORT_SYMBOL(panic_notifier_list);
 ATOMIC_NOTIFIER_HEAD(panic_hypervisor_list);
 EXPORT_SYMBOL(panic_hypervisor_list);
 
+ATOMIC_NOTIFIER_HEAD(panic_info_list);
+EXPORT_SYMBOL(panic_info_list);
+
 static long no_blink(int state)
 {
 	return 0;

@@ -291,6 +294,7 @@ void panic(const char *fmt, ...)
 	 * add information to the kmsg dump output.
 	 */
 	atomic_notifier_call_chain(&panic_hypervisor_list, PANIC_NOTIFIER, buf);
+	atomic_notifier_call_chain(&panic_info_list, PANIC_NOTIFIER, buf);
 	atomic_notifier_call_chain(&panic_notifier_list, PANIC_NOTIFIER, buf);
 
 	panic_print_sys_info(false);

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index a4b8189455d5..d5a2674ae81c 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c

@@ -35,7 +35,6 @@
 #include <linux/panic.h>
 #include <linux/panic_notifier.h>
 #include <linux/percpu.h>
-#include <linux/notifier.h>
 #include <linux/cpu.h>
 #include <linux/mutex.h>
 #include <linux/time.h>

diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
index 0c5d8516516a..d8a5840aad5d 100644
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h

@@ -97,11 +97,12 @@ static int rcu_panic(struct notifier_block *this, unsigned long ev, void *ptr)
 
 static struct notifier_block rcu_panic_block = {
 	.notifier_call = rcu_panic,
+	.priority = INT_MAX, /* run early to prevent potential log flood */
 };
 
 static int __init check_cpu_stall_init(void)
 {
-	atomic_notifier_chain_register(&panic_notifier_list, &rcu_panic_block);
+	atomic_notifier_chain_register(&panic_info_list, &rcu_panic_block);
 	return 0;
 }
 early_initcall(check_cpu_stall_init);

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c1d8a3622ccc..7d02f7a66bb1 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c

@@ -10138,7 +10138,7 @@ __init static int tracer_alloc_buffers(void)
 	/* All seems OK, enable tracing */
 	tracing_disabled = 0;
 
-	atomic_notifier_chain_register(&panic_notifier_list,
+	atomic_notifier_chain_register(&panic_info_list,
 				       &trace_panic_notifier);
 
 	register_die_notifier(&trace_die_notifier);

-- 
2.36.0