linux-kernel - [for-next][PATCH 01/19] ring-buffer: Fix ring buffer size in rb_write

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Date:   Wed, 03 Apr 2019 21:37:22 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [for-next][PATCH 01/19] ring-buffer: Fix ring buffer size in rb_write_something()

From: YueHaibing <yuehaibing@...wei.com>

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

Link: http://lkml.kernel.org/r/1537704693-184237-1-git-send-email-yuehaibing@huawei.com

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 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 41b6f96e5366..4f33d7d841af 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -4979,7 +4979,7 @@ 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);
 
-- 
2.20.1