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Subject[PATCH 1/5] ring-buffer: reset write field for ring_buffer_read_page
From: Steven Rostedt <srostedt@redhat.com>

Impact: fix ring_buffer_read_page

After a page is swapped into the ring buffer, the write field must
also be reset.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---
kernel/trace/ring_buffer.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index a8c275c..9baad7e 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -2492,6 +2492,7 @@ int ring_buffer_read_page(struct ring_buffer *buffer,
rb_init_page(bpage);
bpage = cpu_buffer->reader_page->page;
cpu_buffer->reader_page->page = *data_page;
+ local_set(&cpu_buffer->reader_page->write, 0);
cpu_buffer->reader_page->read = 0;
*data_page = bpage;
}
--
1.5.6.5
--


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