Re: [PATCH 2/2]: atomic_t: Remove volatile from atomic_t definition

From: David Miller
Date: Fri May 21 2010 - 02:11:52 EST

From: Nick Piggin <npiggin@xxxxxxx>
Date: Fri, 21 May 2010 16:06:00 +1000

> Actually, I bet we have a lot of bugs there with loading integers and
> pointers atomically, where the code assumes the loaded value will not
> be reloaded by the compiler, because it is an easy thing to assume.

Alexey Kuznetsov was aware of this problem 8+ years ago when we were
first adding fine-grained locking the the networking.

> atomic_read_light could be useful though, for sure.

I definitely think so. And every usage of it should have a big fat
comment right next to it explaining how it's usage is valid in that
spot :-)
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