From: Lai Jiangshan <laijs@cn.fujitsu.com>
Date: Mon, 9 Feb 2009 06:21:17 +0000 (+0800)
Subject: ring_buffer: fix ring_buffer_read_page()
X-Git-Tag: v2.6.30-rc1~2^2~113^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=667d24125839b6f3363d8177d7ed9fab8a40e45f;p=pandora-kernel.git

ring_buffer: fix ring_buffer_read_page()

Impact: change API and init bpage when copy

ring_buffer_read_page()/rb_remove_entries() may be called for
a partially consumed page.

Add a parameter for rb_remove_entries() and make it update
cpu_buffer->entries correctly for partially consumed pages.

ring_buffer_read_page() now returns the offset to the next event.

Init the bpage's time_stamp when return value is 0.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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