[PATCH 2/3] kexec: Pass panic message to crash_kexec()
Hidehiro Kawai
hidehiro.kawai.ez at hitachi.com
Fri Jul 10 04:33:31 PDT 2015
Add an argument to crash_kexec() to pass the panic message. This
patch is a preparation for the next patch, and it doesn't change
the current behavior.
Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez at hitachi.com>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Eric Biederman <ebiederm at xmission.com>
Cc: Vivek Goyal <vgoyal at redhat.com>
---
arch/arm/kernel/traps.c | 2 +-
arch/arm64/kernel/traps.c | 2 +-
arch/metag/kernel/traps.c | 2 +-
arch/mips/kernel/traps.c | 2 +-
arch/powerpc/kernel/traps.c | 2 +-
arch/s390/kernel/ipl.c | 2 +-
arch/sh/kernel/traps.c | 2 +-
arch/x86/kernel/dumpstack.c | 2 +-
arch/x86/platform/uv/uv_nmi.c | 2 +-
include/linux/kexec.h | 7 +++++--
kernel/kexec.c | 23 ++++++++++++++++++++++-
kernel/panic.c | 4 ++--
12 files changed, 38 insertions(+), 14 deletions(-)
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index d358226..abb7b86 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -293,7 +293,7 @@ static unsigned long oops_begin(void)
static void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
{
if (regs && kexec_should_crash(current))
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, current);
bust_spinlocks(0);
die_owner = -1;
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 566bc4c..17a6841 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -233,7 +233,7 @@ void die(const char *str, struct pt_regs *regs, int err)
ret = __die(str, err, thread, regs);
if (regs && kexec_should_crash(thread->task))
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, thread->task);
bust_spinlocks(0);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
diff --git a/arch/metag/kernel/traps.c b/arch/metag/kernel/traps.c
index 17b2e2e..dca46c7 100644
--- a/arch/metag/kernel/traps.c
+++ b/arch/metag/kernel/traps.c
@@ -110,7 +110,7 @@ void __noreturn die(const char *str, struct pt_regs *regs,
bust_spinlocks(0);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
if (kexec_should_crash(current))
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, current);
if (in_interrupt())
panic("Fatal exception in interrupt");
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 2a7b38e..46fc9a6 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -402,7 +402,7 @@ void __noreturn die(const char *str, struct pt_regs *regs)
}
if (regs && kexec_should_crash(current))
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, current);
do_exit(sig);
}
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 6530f1b..4e1fe20 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -163,7 +163,7 @@ static void __kprobes oops_end(unsigned long flags, struct pt_regs *regs,
* it through the crashdump code.
*/
if (kexec_should_crash(current) || (TRAP(regs) == 0x100)) {
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, current);
/*
* We aren't the primary crash CPU. We need to send it
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 52fbef91d..67c1f8b 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -1726,7 +1726,7 @@ static void __do_restart(void *ignore)
__arch_local_irq_stosm(0x04); /* enable DAT */
smp_send_stop();
#ifdef CONFIG_CRASH_DUMP
- crash_kexec(NULL);
+ crash_kexec(NULL, "restart");
#endif
on_restart_trigger.action->fn(&on_restart_trigger);
stop_run(&on_restart_trigger);
diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c
index dfdad72..4bfb519 100644
--- a/arch/sh/kernel/traps.c
+++ b/arch/sh/kernel/traps.c
@@ -43,7 +43,7 @@ void die(const char *str, struct pt_regs *regs, long err)
oops_exit();
if (kexec_should_crash(current))
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, current);
if (in_interrupt())
panic("Fatal exception in interrupt");
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 9c30acf..e973a1d 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -229,7 +229,7 @@ unsigned long oops_begin(void)
void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
{
if (regs && kexec_should_crash(current))
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, current);
bust_spinlocks(0);
die_owner = -1;
diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c
index 020c101..8b67644 100644
--- a/arch/x86/platform/uv/uv_nmi.c
+++ b/arch/x86/platform/uv/uv_nmi.c
@@ -499,7 +499,7 @@ static void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs)
/* Call crash to dump system state */
if (master) {
pr_emerg("UV: NMI executing crash_kexec on CPU%d\n", cpu);
- crash_kexec(regs);
+ crash_kexec(regs, "UV: NMI executing crash_kexec");
pr_emerg("UV: crash_kexec unexpectedly returned, ");
if (!kexec_crash_image) {
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index e804306..0a2744d 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -237,7 +237,8 @@ extern int kexec_purgatory_get_set_symbol(struct kimage *image,
unsigned int size, bool get_value);
extern void *kexec_purgatory_get_symbol_addr(struct kimage *image,
const char *name);
-extern void crash_kexec(struct pt_regs *);
+extern void crash_kexec(struct pt_regs *, char *msg);
+extern void crash_kexec_on_oops(struct pt_regs *, struct task_struct *p);
int kexec_should_crash(struct task_struct *);
void crash_save_cpu(struct pt_regs *regs, int cpu);
void crash_save_vmcoreinfo(void);
@@ -321,7 +322,9 @@ int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
#else /* !CONFIG_KEXEC */
struct pt_regs;
struct task_struct;
-static inline void crash_kexec(struct pt_regs *regs) { }
+static inline void crash_kexec(struct pt_regs *regs, char *msg) { }
+static inline void crash_kexec_on_oops(struct pt_regs *regs,
+ struct task_struct *p) { }
static inline int kexec_should_crash(struct task_struct *p) { return 0; }
#endif /* CONFIG_KEXEC */
diff --git a/kernel/kexec.c b/kernel/kexec.c
index a785c10..9c7894f 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1470,7 +1470,7 @@ void __weak crash_unmap_reserved_pages(void)
#endif /* CONFIG_KEXEC_FILE */
-void crash_kexec(struct pt_regs *regs)
+void crash_kexec(struct pt_regs *regs, char *msg)
{
/* Take the kexec_mutex here to prevent sys_kexec_load
* running on one cpu from replacing the crash kernel
@@ -1493,6 +1493,27 @@ void crash_kexec(struct pt_regs *regs)
}
}
+void crash_kexec_on_oops(struct pt_regs *regs, struct task_struct *p)
+{
+ static char buf[128];
+ char *msg = "Die for unknown reason";
+
+ if (in_interrupt())
+ msg = "Fatal exception in interrupt";
+ else if (panic_on_oops)
+ msg = "Fatal exception";
+ else if (!p->pid)
+ msg = "Attempted to kill the idle task!";
+ else if (is_global_init(p)) {
+ snprintf(buf, sizeof(buf),
+ "Attempted to kill init! exitcode=0x%08x",
+ p->signal->group_exit_code ?: p->exit_code);
+ msg = buf;
+ }
+
+ crash_kexec(regs, msg);
+}
+
size_t crash_get_memory_size(void)
{
size_t size = 0;
diff --git a/kernel/panic.c b/kernel/panic.c
index 5252331..93008b6 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -118,7 +118,7 @@ void panic(const char *fmt, ...)
* the "crash_kexec_post_notifiers" option to the kernel.
*/
if (!crash_kexec_post_notifiers)
- crash_kexec(NULL);
+ crash_kexec(NULL, buf);
/*
* Note smp_send_stop is the usual smp shutdown function, which
@@ -143,7 +143,7 @@ void panic(const char *fmt, ...)
* more unstable, it can increase risks of the kdump failure too.
*/
if (crash_kexec_post_notifiers)
- crash_kexec(NULL);
+ crash_kexec(NULL, buf);
bust_spinlocks(0);
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