Re: [Ext2-devel] Re: [Patch 7/10]: ext3 online resize: SMP locking for group metadata

[Matthew Wilcox]

On Fri, Oct 01, 2004 at 12:40:38PM +0100, Stephen C. Tweedie wrote:
> So I don't want to make it atomic if I can avoid it.  It's just an
> unsigned long, and I don't know of any cases where a simple read
> colliding with a write is going to give the reader a corrupt value.  As
> long as I get either the old or new value, everything should be fine
> with the read/write barriers as they are.

I think all Linux architectures guarantee atomic updates of a
register-sized naturally-aligned piece of memory.

-- 
"Next the statesmen will invent cheap lies, putting the blame upon 
the nation that is attacked, and every man will be glad of those
conscience-soothing falsities, and will diligently study them, and refuse
to examine any refutations of them; and thus he will by and by convince 
himself that the war is just, and will thank God for the better sleep 
he enjoys after this process of grotesque self-deception." -- Mark Twain
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