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[PATCH] debug: add sysrq_always_enabled boot option

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Most distributions enable sysrq support but set it to 0 by default.  Add a
sysrq_always_enabled boot option to always-enable sysrq keys.  Useful for
debugging - without having to modify the disribution's config files (which
might not be possible if the kernel is on a live CD, etc.).

Also, while at it, clean up the sysrq interfaces.

[bunk@stusta.de: make sysrq_always_enabled_setup() static]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar
2006-12-13 00:34:36 -08:00
committed by Linus Torvalds
parent e61c90188b
commit 5d6f647fc6
5 changed files with 60 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/sysrq.h
+18 -4
View File
@@ -37,23 +37,37 @@ struct sysrq_key_op {
#ifdef CONFIG_MAGIC_SYSRQ
extern int sysrq_on(void);
/*
* Do not use this one directly:
*/
extern int __sysrq_enabled;
/* Generic SysRq interface -- you may call it from any device driver, supplying
* ASCII code of the key, pointer to registers and kbd/tty structs (if they
* are available -- else NULL's).
*/
void handle_sysrq(int, struct tty_struct *);
void __handle_sysrq(int, struct tty_struct *, int check_mask);
int register_sysrq_key(int, struct sysrq_key_op *);
int unregister_sysrq_key(int, struct sysrq_key_op *);
void handle_sysrq(int key, struct tty_struct *tty);
void __handle_sysrq(int key, struct tty_struct *tty, int check_mask);
int register_sysrq_key(int key, struct sysrq_key_op *op);
int unregister_sysrq_key(int key, struct sysrq_key_op *op);
struct sysrq_key_op *__sysrq_get_key_op(int key);
#else
static inline int sysrq_on(void)
{
return 0;
}
static inline int __reterr(void)
{
return -EINVAL;
}
static inline void handle_sysrq(int key, struct tty_struct *tty)
{
}
#define register_sysrq_key(ig,nore) __reterr()
#define unregister_sysrq_key(ig,nore) __reterr()