[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>
diff --git a/drivers/char/viocons.c b/drivers/char/viocons.c
index 6d2e314..0e0da44 100644
--- a/drivers/char/viocons.c
+++ b/drivers/char/viocons.c
@@ -61,10 +61,7 @@
static DEFINE_SPINLOCK(consolelock);
static DEFINE_SPINLOCK(consoleloglock);
-#ifdef CONFIG_MAGIC_SYSRQ
static int vio_sysrq_pressed;
-extern int sysrq_enabled;
-#endif
#define VIOCHAR_NUM_BUF 16
@@ -936,8 +933,10 @@
*/
num_pushed = 0;
for (index = 0; index < cevent->len; index++) {
-#ifdef CONFIG_MAGIC_SYSRQ
- if (sysrq_enabled) {
+ /*
+ * Will be optimized away if !CONFIG_MAGIC_SYSRQ:
+ */
+ if (sysrq_on()) {
/* 0x0f is the ascii character for ^O */
if (cevent->data[index] == '\x0f') {
vio_sysrq_pressed = 1;
@@ -956,7 +955,6 @@
continue;
}
}
-#endif
/*
* The sysrq sequence isn't included in this check if
* sysrq is enabled and compiled into the kernel because