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Re: [Xen-devel] [PATCH] i386 linux: make 32-bit PAE kernel work when bui
| To: | "Jan Beulich" <JBeulich@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] i386 linux: make 32-bit PAE kernel work when built with newer gcc |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Tue, 14 Mar 2006 10:09:29 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 14 Mar 2006 10:13:51 +0000 |
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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 ofXen). Won't this need a barrier() (compile barrier) between the updates of low and high portions? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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