linux-kernel - Re: [PATCHv2] perf: Fix vmalloc ring buffer free function

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Message-ID: <CAFTL4hzpRK9tTY06nWJ7LWn13Bf2wewru4-1W3wbtDkJry5X4A@mail.gmail.com>
Date:	Wed, 6 Mar 2013 16:40:46 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCHv2] perf: Fix vmalloc ring buffer free function

2013/3/6 Jiri Olsa <jolsa@...hat.com>:
> nope, because CONFIG_PERF_USE_VMALLOC rb uses only 1st slot
> of rg->data_pages[], so rb->nr_page is either 0 or 1
>
> the actuall number of pages is counted via rb->page_order
> (which is -1 for case with no data pages)

Ah right.
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