[PATCH v14 4/5] ring-buffer: Reset RB_MISSED_* flags on persistent ring buffer

[Masami Hiramatsu (Google)]

From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>

Reset RB_MISSED_* flags when the persistent ring buffer is
validated at boot. Since these flags are used only in reading
process, such process should be stopped when reboot and never
be restarted. Thus, these flags are meaningless in the next
boot. Moreover, it can confuse the read process after reboot.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
---
 Changes in v14:
   - Newly added.
---
 kernel/trace/ring_buffer.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index e5178239f2f9..5049cf13021e 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -1903,6 +1903,7 @@ static int rb_validate_buffer(struct buffer_page *bpage, int cpu,
 		local_set(&bpage->page->commit, 0);
 	} else {
 		local_set(&bpage->entries, ret);
+		local_set(&bpage->page->commit, tail);
 	}
 
 	return ret;