[PATCH 2/7] powerpc: Use die_spin_lock_{irqsave,irqrestore}

[Anton Blanchard]

Replace the powerpc specific oops locking with the common one.

Signed-off-by: Anton Blanchard <an...@samba.org>
---
 arch/powerpc/kernel/traps.c | 24 +++---------------------
 1 file changed, 3 insertions(+), 21 deletions(-)

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 19e4744..4cc1e72 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -36,6 +36,7 @@
 #include <linux/debugfs.h>
 #include <linux/ratelimit.h>
 #include <linux/context_tracking.h>
+#include <linux/die_lock.h>
 
 #include <asm/emulated_ops.h>
 #include <asm/pgtable.h>
@@ -109,14 +110,10 @@ static void pmac_backlight_unblank(void)
 static inline void pmac_backlight_unblank(void) { }
 #endif
 
-static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
-static int die_owner = -1;
-static unsigned int die_nest_count;
 static int die_counter;
 
 static unsigned __kprobes long oops_begin(struct pt_regs *regs)
 {
-       int cpu;
        unsigned long flags;
 
        if (debugger(regs))
@@ -124,17 +121,7 @@ static unsigned __kprobes long oops_begin(struct pt_regs 
*regs)
 
        oops_enter();
 
-       /* racy, but better than risking deadlock. */
-       raw_local_irq_save(flags);
-       cpu = smp_processor_id();
-       if (!arch_spin_trylock(&die_lock)) {
-               if (cpu == die_owner)
-                       /* nested oops. should stop eventually */;
-               else
-                       arch_spin_lock(&die_lock);
-       }
-       die_nest_count++;
-       die_owner = cpu;
+       die_spin_lock_irqsave(flags);
        console_verbose();
        bust_spinlocks(1);
        if (machine_is(powermac))
@@ -146,15 +133,10 @@ static void __kprobes oops_end(unsigned long flags, 
struct pt_regs *regs,
                               int signr)
 {
        bust_spinlocks(0);
-       die_owner = -1;
        add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
-       die_nest_count--;
        oops_exit();
        printk("\n");
-       if (!die_nest_count)
-               /* Nest count reaches zero, release the lock. */
-               arch_spin_unlock(&die_lock);
-       raw_local_irq_restore(flags);
+       die_spin_unlock_irqrestore(flags);
 
        crash_fadump(regs, "die oops");
 
-- 
2.1.0

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