linux-kernel - [PATCH -next] ring-buffer: Fix ring buffer size in rb_write

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Date:   Sun, 23 Sep 2018 12:11:33 +0000
From:   YueHaibing <yuehaibing@...wei.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
CC:     YueHaibing <yuehaibing@...wei.com>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: [PATCH -next] ring-buffer: Fix ring buffer size in rb_write_something

'cnt' should be used to calculate ring buffer size rather than data->cnt

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 kernel/trace/ring_buffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 65bd461..53538c3 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -4924,7 +4924,7 @@ static __init int rb_write_something(struct rb_test_data *data, bool nested)
 	cnt = data->cnt + (nested ? 27 : 0);
 
 	/* Multiply cnt by ~e, to make some unique increment */
-	size = (data->cnt * 68 / 25) % (sizeof(rb_string) - 1);
+	size = (cnt * 68 / 25) % (sizeof(rb_string) - 1);
 
 	len = size + sizeof(struct rb_item);