Re: [Xen-devel] [PATCH] i386 linux: make 32-bit PAE kernel work when built with newer gcc

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 13 Mar 2006, at 16:40, Jan Beulich wrote:

> The compiler isn't required to order the two stores 
> ptep_get_and_clear_full() in any particular way, and we saw cases
> where the upper 32 bits get stored before the lower ones, which causes 
> the access to fail (page-fault propagated out of
> Xen).
Won't this need a barrier() (compile barrier) between the updates of 
low and high portions?
 -- Keir


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