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authorHariprasad Nellitheertha <hari@in.ibm.com>2005-06-25 17:58:25 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 19:24:54 -0400
commit86b1ae38c0a62409dc862a28e3f08920f55f944b (patch)
treede7e2803949d9585d6d5554cbad9063d5d62f2cc /drivers/char/sysrq.c
parent315c215c0a7324894541d43b0e720f20cafca92e (diff)
[PATCH] kdump: sysrq trigger mechanism for kexec based crashdumps
Add a sysrq-trigger mechanism for kexec based crashdumps. Alt-Sysrq-c triggers a kexec based crashdump. Signed-off-by: Hariprasad Nellitheertha <hari@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/sysrq.c')
-rw-r--r--drivers/char/sysrq.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index f59f7cbd525..53b2c8fab00 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -35,6 +35,7 @@
35#include <linux/spinlock.h> 35#include <linux/spinlock.h>
36#include <linux/vt_kern.h> 36#include <linux/vt_kern.h>
37#include <linux/workqueue.h> 37#include <linux/workqueue.h>
38#include <linux/kexec.h>
38 39
39#include <asm/ptrace.h> 40#include <asm/ptrace.h>
40 41
@@ -94,6 +95,21 @@ static struct sysrq_key_op sysrq_unraw_op = {
94}; 95};
95#endif /* CONFIG_VT */ 96#endif /* CONFIG_VT */
96 97
98#ifdef CONFIG_KEXEC
99/* crashdump sysrq handler */
100static void sysrq_handle_crashdump(int key, struct pt_regs *pt_regs,
101 struct tty_struct *tty)
102{
103 crash_kexec();
104}
105static struct sysrq_key_op sysrq_crashdump_op = {
106 .handler = sysrq_handle_crashdump,
107 .help_msg = "Crashdump",
108 .action_msg = "Trigger a crashdump",
109 .enable_mask = SYSRQ_ENABLE_DUMP,
110};
111#endif
112
97/* reboot sysrq handler */ 113/* reboot sysrq handler */
98static void sysrq_handle_reboot(int key, struct pt_regs *pt_regs, 114static void sysrq_handle_reboot(int key, struct pt_regs *pt_regs,
99 struct tty_struct *tty) 115 struct tty_struct *tty)
@@ -273,8 +289,12 @@ static struct sysrq_key_op *sysrq_key_table[SYSRQ_KEY_TABLE_LENGTH] = {
273 it is handled specially on the sparc 289 it is handled specially on the sparc
274 and will never arrive */ 290 and will never arrive */
275/* b */ &sysrq_reboot_op, 291/* b */ &sysrq_reboot_op,
276/* c */ NULL, 292#ifdef CONFIG_KEXEC
277/* d */ NULL, 293/* c */ &sysrq_crashdump_op,
294#else
295/* c */ NULL,
296#endif
297/* d */ NULL,
278/* e */ &sysrq_term_op, 298/* e */ &sysrq_term_op,
279/* f */ &sysrq_moom_op, 299/* f */ &sysrq_moom_op,
280/* g */ NULL, 300/* g */ NULL,