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[IA64] Fix the order of atomic operations in restore_previous_kprobes on ia64 

Fix the order of atomic operations to prevent overwriting prev_kprobe[0].
To pop values from stack, we must decrement stack index right AFTER
reading values.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Masami Hiramatsu 2008-01-18 11:20:46 -05:00 committed by Tony Luck
parent a23fe55e13
commit 97075c4b3b
1 changed files with 4 additions and 3 deletions
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7
arch/ia64/kernel/kprobes.c
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@ -381,9 +381,10 @@ static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
{
unsigned int i;
i = atomic_sub_return(1, &kcb->prev_kprobe_index);
__get_cpu_var(current_kprobe) = kcb->prev_kprobe[i].kp;
kcb->kprobe_status = kcb->prev_kprobe[i].status;
i = atomic_read(&kcb->prev_kprobe_index);
__get_cpu_var(current_kprobe) = kcb->prev_kprobe[i-1].kp;
kcb->kprobe_status = kcb->prev_kprobe[i-1].status;
atomic_sub(1, &kcb->prev_kprobe_index);
}
static void __kprobes set_current_kprobe(struct kprobe *p,