path: root/include
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authorIngo Molnar <mingo@elte.hu>2006-12-13 00:34:36 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-13 09:05:50 -0800
commit5d6f647fc6bb57377c9f417c4752e43189f56bb1 (patch)
treeab30c24c021adc549aab6bf042108d920975d9a9 /include
parent[PATCH] optimize o_direct on block devices (diff)
[PATCH] debug: add sysrq_always_enabled boot option
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>
Diffstat (limited to 'include')
1 files changed, 18 insertions, 4 deletions
diff --git a/include/linux/sysrq.h b/include/linux/sysrq.h
index 9df8833670cb..98a1d8cfb73d 100644
--- a/include/linux/sysrq.h
+++ b/include/linux/sysrq.h
@@ -37,23 +37,37 @@ struct sysrq_key_op {
+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);
+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()