diff options
| author | Masami Hiramatsu <mhiramat@redhat.com> | 2008-01-18 11:20:46 -0500 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2008-02-04 15:09:39 -0800 |
| commit | 97075c4b3b7fdd6a083eea075c3a4a601f0d64d8 (patch) | |
| tree | 300e612c7810901e721c594846d8ad2bfaf60a7c /arch/ia64/kernel/kprobes.c | |
| parent | a23fe55e132cd85108ab55b3fafb4b5060d847c7 (diff) | |
[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>
Diffstat (limited to 'arch/ia64/kernel/kprobes.c')
| -rw-r--r-- | arch/ia64/kernel/kprobes.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c index fc4d2676264..b618487cdc8 100644 --- a/arch/ia64/kernel/kprobes.c +++ b/arch/ia64/kernel/kprobes.c @@ -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, |