From: Masami Hiramatsu <mhiramat@kernel.org>
Date: Wed, 19 Apr 2017 12:52:25 +0000 (+0530)
Subject: kprobes: Skip preparing optprobe if the probe is ftrace-based
X-Git-Tag: v4.14-rc1~913^2~57^2~9
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a460246c70d1ac25a0717112e7a167240c7aca1a;p=platform%2Fkernel%2Flinux-rpi.git

kprobes: Skip preparing optprobe if the probe is ftrace-based

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.rao@linux.vnet.ibm.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 699c5bc5..d179839 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -746,13 +746,20 @@ 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 */
@@ -766,7 +773,7 @@ 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;
 }