[PATCH v4 3/6] kprobes: Skip preparing optprobe if the probe is ftrace-based

[Naveen N. Rao]

From: Masami Hiramatsu <mhira...@kernel.org>

Skip preparing optprobe if the probe is ftrace-based, since anyway, it
must not be optimized (or already optimized by ftrace).

Tested-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
Signed-off-by: Masami Hiramatsu <mhira...@kernel.org>
---
 kernel/kprobes.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index bb86681c8a10..50c48c5b6490 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -743,13 +743,20 @@ static void kill_optimized_kprobe(struct kprobe *p)
        arch_remove_optimized_kprobe(op);
 }
 
+static inline
+void __prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *p)
+{
+       if (!kprobe_ftrace(p))
+               arch_prepare_optimized_kprobe(op, p);
+}
+
 /* Try to prepare optimized instructions */
 static void prepare_optimized_kprobe(struct kprobe *p)
 {
        struct optimized_kprobe *op;
 
        op = container_of(p, struct optimized_kprobe, kp);
-       arch_prepare_optimized_kprobe(op, p);
+       __prepare_optimized_kprobe(op, p);
 }
 
 /* Allocate new optimized_kprobe and try to prepare optimized instructions */
@@ -763,7 +770,7 @@ static struct kprobe *alloc_aggr_kprobe(struct kprobe *p)
 
        INIT_LIST_HEAD(&op->list);
        op->kp.addr = p->addr;
-       arch_prepare_optimized_kprobe(op, p);
+       __prepare_optimized_kprobe(op, p);
 
        return &op->kp;
 }
-- 
2.12.1