[PATCH RT] disable preemption on running show all regs.

From: Steven Rostedt
Date: Tue Jun 19 2007 - 16:18:43 EST


The show all regs sysrq uses the nmi function to do it. But this
function expects preemption to be off, or funny things happen.

Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>

Index: linux-2.6.21-rt9/drivers/char/sysrq.c
===================================================================
--- linux-2.6.21-rt9.orig/drivers/char/sysrq.c
+++ linux-2.6.21-rt9/drivers/char/sysrq.c
@@ -213,7 +213,9 @@ static struct sysrq_key_op sysrq_showreg

static void sysrq_handle_showallregs(int key, struct tty_struct *tty)
{
+ preempt_disable();
nmi_show_all_regs();
+ preempt_enable();
}

static struct sysrq_key_op sysrq_showallregs_op = {


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