linux-kernel - Re: [PATCH] Fix race in ring_buffer_consume(): Replace ring_buffer_consume and ring_buffer_peek with ring_buffer_get

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Date:	Thu, 1 Jan 2009 06:10:24 +0100 (CET)
From:	"Indan Zupancic" <indan@....nu>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Steven Rostedt" <srostedt@...hat.com>,
	"Ingo Molnar" <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix race in ring_buffer_consume(): Replace 
     ring_buffer_consume and ring_buffer_peek with ring_buffer_get_event

On Mon, December 29, 2008 13:24, Ingo Molnar wrote:
>
> * Indan Zupancic <indan@....nu> wrote:
>
>> Original mail was mangled, patch resent via git.
>>
>> Signed-off-by: Indan Zupancic <indan@....nu>
>> ---
>>  include/linux/ring_buffer.h   |    4 +---
>>  kernel/trace/ring_buffer.c    |   39
>> ++++++++-------------------------------
>>  kernel/trace/trace.c          |   15 ++++++++-------
>>  kernel/trace/trace_selftest.c |    2 +-
>>  4 files changed, 18 insertions(+), 42 deletions(-)
>
> there's been a number of updates here - could you please do a patch
> against tip/master:
>
>   http://people.redhat.com/mingo/tip.git/README

Thanks for that readme, now I discovered git remote, which is not
mentioned often enough for some reason.

A lot changed indeed, most importantly the race that I hit is
fixed in tip by improved locking. Replace ring_buffer_consume()
and ring_buffer_peek() with ring_buffer_get_event() or not is
just a matter of taste now. Are you still interested in such a
patch?

(34 EXPORT_SYMBOL_GPLs in ring_buffer.c seems a bit excessive though.)

Greetings,

Indan


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