sparc64: Run NMIs on the hardirq stack.
Otherwise we can overflow the main stack with the function tracer
enabled.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/nmi.c b/arch/sparc/kernel/nmi.c
index 75a3d1a..a4bd7ba 100644
--- a/arch/sparc/kernel/nmi.c
+++ b/arch/sparc/kernel/nmi.c
@@ -23,6 +23,8 @@
#include <asm/ptrace.h>
#include <asm/pcr.h>
+#include "kstack.h"
+
/* We don't have a real NMI on sparc64, but we can fake one
* up using profiling counter overflow interrupts and interrupt
* levels.
@@ -92,6 +94,7 @@
notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)
{
unsigned int sum, touched = 0;
+ void *orig_sp;
clear_softint(1 << irq);
@@ -99,6 +102,8 @@
nmi_enter();
+ orig_sp = set_hardirq_stack();
+
if (notify_die(DIE_NMI, "nmi", regs, 0,
pt_regs_trap_type(regs), SIGINT) == NOTIFY_STOP)
touched = 1;
@@ -124,6 +129,8 @@
pcr_ops->write(pcr_enable);
}
+ restore_hardirq_stack(orig_sp);
+
nmi_exit();
}