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| author | Masami Hiramatsu <mhiramat@redhat.com> | 2008-01-18 17:20:46 +0100 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2008-02-05 00:09:39 +0100 |
| commit | 97075c4b3b7fdd6a083eea075c3a4a601f0d64d8 (patch) | |
| tree | 300e612c7810901e721c594846d8ad2bfaf60a7c | |
| parent | [IA64] constify function pointer tables (diff) | |
| download | linux-97075c4b3b7fdd6a083eea075c3a4a601f0d64d8.tar.xz linux-97075c4b3b7fdd6a083eea075c3a4a601f0d64d8.zip | |
[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>
| -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 fc4d2676264f..b618487cdc85 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, |