From 61598093bbdd283a7edc367d900f223070ead8d2 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:43:03 +0000
Subject: [PATCH] add ax88772C AX88772C_eeprom_tools
---
kernel/kernel/panic.c | 123 +++++++++++++++++++++++++++++++----------
1 files changed, 93 insertions(+), 30 deletions(-)
diff --git a/kernel/kernel/panic.c b/kernel/kernel/panic.c
index 873fedb..bc39e2b 100644
--- a/kernel/kernel/panic.c
+++ b/kernel/kernel/panic.c
@@ -31,6 +31,7 @@
#include <linux/bug.h>
#include <linux/ratelimit.h>
#include <linux/debugfs.h>
+#include <linux/sysfs.h>
#include <asm/sections.h>
#define PANIC_TIMER_STEP 100
@@ -41,7 +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;
@@ -54,6 +57,7 @@
int panic_on_warn __read_mostly;
unsigned long panic_on_taint;
bool panic_on_taint_nousertaint = false;
+static unsigned int warn_limit __read_mostly;
int panic_timeout = CONFIG_PANIC_TIMEOUT;
EXPORT_SYMBOL_GPL(panic_timeout);
@@ -69,6 +73,56 @@
ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
EXPORT_SYMBOL(panic_notifier_list);
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table kern_panic_table[] = {
+#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
+ {
+ .procname = "warn_limit",
+ .data = &warn_limit,
+ .maxlen = sizeof(warn_limit),
+ .mode = 0644,
+ .proc_handler = proc_douintvec,
+ },
+ { }
+};
+
+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 atomic_t warn_count = ATOMIC_INIT(0);
+
+#ifdef CONFIG_SYSFS
+static ssize_t warn_count_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *page)
+{
+ return sysfs_emit(page, "%d\n", atomic_read(&warn_count));
+}
+
+static struct kobj_attribute warn_count_attr = __ATTR_RO(warn_count);
+
+static __init int kernel_panic_sysfs_init(void)
+{
+ sysfs_add_file_to_group(kernel_kobj, &warn_count_attr.attr, NULL);
+ return 0;
+}
+late_initcall(kernel_panic_sysfs_init);
+#endif
static long no_blink(int state)
{
@@ -166,6 +220,19 @@
ftrace_dump(DUMP_ALL);
}
+void check_panic_on_warn(const char *origin)
+{
+ unsigned int limit;
+
+ if (panic_on_warn)
+ panic("%s: panic_on_warn set ...\n", origin);
+
+ limit = READ_ONCE(warn_limit);
+ if (atomic_inc_return(&warn_count) >= limit && limit)
+ panic("%s: system warned too often (kernel.warn_limit is %d)",
+ origin, limit);
+}
+
/**
* panic - halt the system
* @fmt: The text string to print
@@ -177,12 +244,21 @@
void panic(const char *fmt, ...)
{
static char buf[1024];
- va_list args2;
va_list args;
long i, i_next = 0, len;
int state = 0;
int old_cpu, this_cpu;
bool _crash_kexec_post_notifiers = crash_kexec_post_notifiers;
+
+ if (panic_on_warn) {
+ /*
+ * This thread may hit another WARN() in the panic path.
+ * Resetting this prevents additional WARN() from panicking the
+ * system on this thread. Other threads are blocked by the
+ * panic_mutex in panic().
+ */
+ panic_on_warn = 0;
+ }
/*
* Disable local interrupts. This will prevent panic_smp_self_stop
@@ -192,21 +268,6 @@
*/
local_irq_disable();
preempt_disable_notrace();
-
- console_verbose();
- pr_emerg("Kernel panic - not syncing:\n");
- va_start(args2, fmt);
- va_copy(args, args2);
- vprintk(fmt, args2);
- va_end(args2);
-#ifdef CONFIG_DEBUG_BUGVERBOSE
- /*
- * Avoid nested stack-dumping if a panic occurs during oops processing
- */
- if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
- dump_stack();
-#endif
- pr_flush(1000, true);
/*
* It's possible to come here directly from a panic-assertion and
@@ -229,12 +290,23 @@
if (old_cpu != PANIC_CPU_INVALID && old_cpu != this_cpu)
panic_smp_self_stop();
+ console_verbose();
bust_spinlocks(1);
+ va_start(args, fmt);
len = vscnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
if (len && buf[len - 1] == '\n')
buf[len - 1] = '\0';
+
+ pr_emerg("Kernel panic - not syncing: %s\n", buf);
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+ /*
+ * Avoid nested stack-dumping if a panic occurs during oops processing
+ */
+ if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
+ dump_stack();
+#endif
/*
* If kgdb is enabled, give it a chance to run before we stop all
@@ -252,6 +324,7 @@
* Bypass the panic_cpu check and call __crash_kexec directly.
*/
if (!_crash_kexec_post_notifiers) {
+ printk_safe_flush_on_panic();
__crash_kexec(NULL);
/*
@@ -275,6 +348,8 @@
*/
atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
+ /* Call flush even twice. It tries harder with a single online CPU */
+ printk_safe_flush_on_panic();
kmsg_dump(KMSG_DUMP_PANIC);
/*
@@ -544,11 +619,9 @@
static int init_oops_id(void)
{
-#ifndef CONFIG_PREEMPT_RT
if (!oops_id)
get_random_bytes(&oops_id, sizeof(oops_id));
else
-#endif
oops_id++;
return 0;
@@ -559,7 +632,6 @@
{
init_oops_id();
pr_warn("---[ end trace %016llx ]---\n", (unsigned long long)oops_id);
- pr_flush(1000, true);
}
/*
@@ -599,16 +671,7 @@
if (regs)
show_regs(regs);
- if (panic_on_warn) {
- /*
- * This thread may hit another WARN() in the panic path.
- * Resetting this prevents additional WARN() from panicking the
- * system on this thread. Other threads are blocked by the
- * panic_mutex in panic().
- */
- panic_on_warn = 0;
- panic("panic_on_warn set ...\n");
- }
+ check_panic_on_warn("kernel");
if (!regs)
dump_stack();
--
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