[PATCH v1 04/12] sys-rq: Add option to soft dump
From: Mike Waychison <hidden>
Date: 2010-11-03 01:30:18
Also in:
lkml
Subsystem:
char and misc drivers, the rest · Maintainers:
Arnd Bergmann, Greg Kroah-Hartman, Linus Torvalds
It is very useful to provide some means to force the kernel logs to make it out via the kmsg_oops implementations on the console. Add a new option 'Y' to sysrq to allow dumping of logs to kmsg_dumper drivers. Signed-off-by: Mike Waychison <redacted> --- drivers/char/sysrq.c | 14 +++++++++++++- 1 files changed, 13 insertions(+), 1 deletions(-)
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index ef31bb8..888efc5 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c@@ -41,6 +41,7 @@ #include <linux/oom.h> #include <linux/slab.h> #include <linux/input.h> +#include <linux/kmsg_dump.h> #include <asm/ptrace.h> #include <asm/irq_regs.h>
@@ -395,6 +396,17 @@ static struct sysrq_key_op sysrq_unrt_op = { .enable_mask = SYSRQ_ENABLE_RTNICE, }; +static void sysrq_handle_softdump(int key) +{ + kmsg_dump(KMSG_DUMP_SOFT, NULL); +} +static struct sysrq_key_op sysrq_softdump_op = { + .handler = sysrq_handle_softdump, + .help_msg = "soft-dump(Y)", + .action_msg = "Trigger a soft dump", + .enable_mask = SYSRQ_ENABLE_DUMP, +}; + /* Key Operations table and lock */ static DEFINE_SPINLOCK(sysrq_key_table_lock);
@@ -451,7 +463,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = { /* x: May be registered on ppc/powerpc for xmon */ NULL, /* x */ /* y: May be registered on sparc64 for global register dump */ - NULL, /* y */ + &sysrq_softdump_op, /* y */ &sysrq_ftrace_dump_op, /* z */ };