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path: root/arch/sparc64/kernel/kprobes.c
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Diffstat (limited to 'arch/sparc64/kernel/kprobes.c')
-rw-r--r--arch/sparc64/kernel/kprobes.c14
1 files changed, 2 insertions, 12 deletions
diff --git a/arch/sparc64/kernel/kprobes.c b/arch/sparc64/kernel/kprobes.c
index b95984154db..58a815e9037 100644
--- a/arch/sparc64/kernel/kprobes.c
+++ b/arch/sparc64/kernel/kprobes.c
@@ -116,15 +116,11 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
if (kprobe_running()) {
- /* We *are* holding lock here, so this is safe.
- * Disarm the probe we just hit, and ignore it.
- */
p = get_kprobe(addr);
if (p) {
if (kcb->kprobe_status == KPROBE_HIT_SS) {
regs->tstate = ((regs->tstate & ~TSTATE_PIL) |
kcb->kprobe_orig_tstate_pil);
- unlock_kprobes();
goto no_kprobe;
}
/* We have reentered the kprobe_handler(), since
@@ -144,14 +140,11 @@ static int __kprobes kprobe_handler(struct pt_regs *regs)
if (p->break_handler && p->break_handler(p, regs))
goto ss_probe;
}
- /* If it's not ours, can't be delete race, (we hold lock). */
goto no_kprobe;
}
- lock_kprobes();
p = get_kprobe(addr);
if (!p) {
- unlock_kprobes();
if (*(u32 *)addr != BREAKPOINT_INSTRUCTION) {
/*
* The breakpoint instruction was removed right
@@ -296,14 +289,12 @@ static inline int post_kprobe_handler(struct pt_regs *regs)
goto out;
}
reset_current_kprobe();
- unlock_kprobes();
out:
preempt_enable_no_resched();
return 1;
}
-/* Interrupts disabled, kprobe_lock held. */
static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
{
struct kprobe *cur = kprobe_running();
@@ -316,7 +307,6 @@ static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
resume_execution(cur, regs, kcb);
reset_current_kprobe();
- unlock_kprobes();
preempt_enable_no_resched();
}
return 0;
@@ -331,7 +321,7 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
struct die_args *args = (struct die_args *)data;
int ret = NOTIFY_DONE;
- preempt_disable();
+ rcu_read_lock();
switch (val) {
case DIE_DEBUG:
if (kprobe_handler(args->regs))
@@ -350,7 +340,7 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
default:
break;
}
- preempt_enable();
+ rcu_read_unlock();
return ret;
}