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Re: [Xen-devel] swiotlb
| To: | "Ky Srinivasan" <ksrinivasan@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] swiotlb |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Fri, 14 Apr 2006 07:50:21 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 13 Apr 2006 23:53:53 -0700 |
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On 13 Apr 2006, at 21:29, Ky Srinivasan wrote: Given that the function __sync_single() can be called in an interrupt context, why do we call a potentially blocking function (__copy_to_user) from within this function? Good point. Would __copy_to_user_inatomic() be safe? It avoids might_sleep(). We know that the page fault itself (if any) will not block on I/O -- we only use __copy_to_user() to safely catch the fault and return. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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