linux-kernel - Re: [interesting] smattering of possible memory ordering bugs

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Date:	Fri, 26 Oct 2007 14:32:27 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	paulus@...ba.org, shaggy@...tin.ibm.com, adaplas@...il.com,
	"Morton, Andrew" <akpm@...ux-foundation.org>,
	xfs-masters@....sgi.com
Subject: Re: [interesting] smattering of possible memory ordering bugs


On Fri, 2007-10-26 at 13:47 +1000, Nick Piggin wrote:

> I don't think the previous code was wrong... it's not a locked section
> > and we don't care about ordering previous stores. It's an
> allocation, it
> > should be fine. In general, bitmap allocators should be allright.
> 
> Well if it is just allocating an arbitrary _number_ out of a bitmap
> and nothing else (eg. like the pid allocator), then you don't need
> barriers.

Yup, that's what it does.

Cheers,
Ben.


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