[PATCH v1 02/12] kmsg_dumper: Pass pt_regs along to dumpers.

Mike Waychison
2010-11-03T01:30:10Z

A subsequent commit adding netoops functionality would like access to the
pt_regs to have them recorded in the dump. Pass the register values along if
available.

Signed-off-by: Mike Waychison <mikew@google.com>
---
drivers/char/ramoops.c | 4 +++-
drivers/mtd/mtdoops.c | 4 +++-
include/linux/kmsg_dump.h | 8 ++++++--
kernel/kexec.c | 5 +++--
kernel/panic.c | 4 ++--
kernel/printk.c | 4 ++--
6 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/drivers/char/ramoops.c b/drivers/char/ramoops.c
index 74f00b5..9acf52c 100644
--- a/drivers/char/ramoops.c
+++ b/drivers/char/ramoops.c
@@ -56,7 +56,9 @@ static struct ramoops_context {
} oops_cxt;

static void ramoops_do_dump(struct kmsg_dumper *dumper,
- enum kmsg_dump_reason reason, const char *s1, unsigned long l1,
+ enum kmsg_dump_reason reason,
+ struct pt_regs *pt_regs,
+ const char *s1, unsigned long l1,
const char *s2, unsigned long l2)
{
struct ramoops_context *cxt = container_of(dumper,
diff --git a/drivers/mtd/mtdoops.c b/drivers/mtd/mtdoops.c
index 1ee72f3..cf07cf5 100644
--- a/drivers/mtd/mtdoops.c
+++ b/drivers/mtd/mtdoops.c
@@ -298,7 +298,9 @@ static void find_next_position(struct mtdoops_context *cxt)
}

static void mtdoops_do_dump(struct kmsg_dumper *dumper,
- enum kmsg_dump_reason reason, const char *s1, unsigned long l1,
+ enum kmsg_dump_reason reason,
+ struct pt_regs *pt_regs,
+ const char *s1, unsigned long l1,
const char *s2, unsigned long l2)
{
struct mtdoops_context *cxt = container_of(dumper,
diff --git a/include/linux/kmsg_dump.h b/include/linux/kmsg_dump.h
index 24b4414..a229acc 100644
--- a/include/linux/kmsg_dump.h
+++ b/include/linux/kmsg_dump.h
@@ -14,6 +14,8 @@

#include <linux/list.h>

+struct pt_regs;
+
enum kmsg_dump_reason {
KMSG_DUMP_OOPS,
KMSG_DUMP_PANIC,
@@ -30,6 +32,7 @@ enum kmsg_dump_reason {
*/
struct kmsg_dumper {
void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason,
+ struct pt_regs *pt_regs,
const char *s1, unsigned long l1,
const char *s2, unsigned long l2);
struct list_head list;
@@ -37,13 +40,14 @@ struct kmsg_dumper {
};

#ifdef CONFIG_PRINTK
-void kmsg_dump(enum kmsg_dump_reason reason);
+void kmsg_dump(enum kmsg_dump_reason reason, struct pt_regs *pt_regs);

int kmsg_dump_register(struct kmsg_dumper *dumper);

int kmsg_dump_unregister(struct kmsg_dumper *dumper);
#else
-static inline void kmsg_dump(enum kmsg_dump_reason reason)
+static inline void kmsg_dump(enum kmsg_dump_reason reason,
+ struct pt_regs *pt_regs)
{
}

diff --git a/kernel/kexec.c b/kernel/kexec.c
index c0613f7..6e89a52 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1078,10 +1078,11 @@ void crash_kexec(struct pt_regs *regs)
if (kexec_crash_image) {
struct pt_regs fixed_regs;

- kmsg_dump(KMSG_DUMP_KEXEC);
-
crash_setup_regs(&fixed_regs, regs);
crash_save_vmcoreinfo();
+
+ kmsg_dump(KMSG_DUMP_KEXEC, &fixed_regs);
+
machine_crash_shutdown(&fixed_regs);
machine_kexec(kexec_crash_image);
}
diff --git a/kernel/panic.c b/kernel/panic.c
index c3f39cd..b3a4440 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -87,7 +87,7 @@ NORET_TYPE void panic(const char * fmt, ...)
*/
crash_kexec(NULL);

- kmsg_dump(KMSG_DUMP_PANIC);
+ kmsg_dump(KMSG_DUMP_PANIC, NULL);

/*
* Note smp_send_stop is the usual smp shutdown function, which
@@ -353,7 +353,7 @@ void oops_exit(struct pt_regs *regs)
{
do_oops_enter_exit();
print_oops_end_marker();
- kmsg_dump(KMSG_DUMP_OOPS);
+ kmsg_dump(KMSG_DUMP_OOPS, regs);
}

#ifdef WANT_WARN_ON_SLOWPATH
diff --git a/kernel/printk.c b/kernel/printk.c
index 8fe465a..ad0c74e 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1532,7 +1532,7 @@ static const char *kmsg_to_str(enum kmsg_dump_reason reason)
* Iterate through each of the dump devices and call the oops/panic
* callbacks with the log buffer.
*/
-void kmsg_dump(enum kmsg_dump_reason reason)
+void kmsg_dump(enum kmsg_dump_reason reason, struct pt_regs *pt_regs)
{
unsigned long end;
unsigned chars;
@@ -1569,7 +1569,7 @@ void kmsg_dump(enum kmsg_dump_reason reason)
return;
}
list_for_each_entry(dumper, &dump_list, list)
- dumper->dump(dumper, reason, s1, l1, s2, l2);
+ dumper->dump(dumper, reason, pt_regs, s1, l1, s2, l2);
spin_unlock_irqrestore(&dump_list_lock, flags);
}
#endif