linux-kernel - [PATCH] tracing/kprobes: Don't pass addr=ip to perf_trace_buf

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Message-ID: <20130619203433.GB19750@redhat.com>
Date:	Wed, 19 Jun 2013 22:34:33 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: [PATCH] tracing/kprobes: Don't pass addr=ip to
	perf_trace_buf_submit()

On 06/19, Oleg Nesterov wrote:
>
> So. I'll resend this series, will you ack the v2 below?

Also. Could you please review the new patch I am going to include
into this series?

This is copy-and-paste of 32520b2c6 which you reviewed and acked.

And please note that kprobes is the last user of
perf_trace_buf_submit(addr != 0), we can make some cleanups on top.

-------------------------------------------------------------------------------
Subject: [PATCH] tracing/kprobes: Don't pass addr=ip to perf_trace_buf_submit()

kprobe_perf_func() and kretprobe_perf_func() pass addr=ip to
perf_trace_buf_submit() for no reason.

This sets perf_sample_data->addr for PERF_SAMPLE_ADDR, we already
have perf_sample_data->ip initialized if PERF_SAMPLE_IP.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 kernel/trace/trace_kprobe.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 3432652..141c682 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1163,8 +1163,7 @@ kprobe_perf_func(struct trace_probe *tp, struct pt_regs *regs)
 	entry->ip = (unsigned long)tp->rp.kp.addr;
 	memset(&entry[1], 0, dsize);
 	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
-	perf_trace_buf_submit(entry, size, rctx,
-					entry->ip, 1, regs, head, NULL);
+	perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
 }
 
 /* Kretprobe profile handler */
@@ -1197,8 +1196,7 @@ kretprobe_perf_func(struct trace_probe *tp, struct kretprobe_instance *ri,
 	entry->func = (unsigned long)tp->rp.kp.addr;
 	entry->ret_ip = (unsigned long)ri->ret_addr;
 	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
-	perf_trace_buf_submit(entry, size, rctx,
-					entry->ret_ip, 1, regs, head, NULL);
+	perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
 }
 #endif	/* CONFIG_PERF_EVENTS */
 
-- 
1.5.5.1


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