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Re: [Xen-devel] [PATCH] Prevent incorrect optimization of read_crx()
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, Joseph Cihula <joseph.cihula@xxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] Prevent incorrect optimization of read_crx() |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Tue, 11 Sep 2007 08:12:01 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 11 Sep 2007 00:08:04 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH] Prevent incorrect optimization of read_crx() |
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On 11/9/07 07:52, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: > Wouldn't you need to put __volatile__ in write_crX(), too? Actually it is surprising that the compiler hasn't been optimising away our write_cr0() entirely. Perhaps it special cases asm blocks with no outputs. Adding the volatile keyword makes a lot of sense anyway. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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