Re: [Xen-devel] Explicit return type for Hypercall

[Tej <bewith.tej@xxxxxxxxx>]

On Thu, Apr 9, 2009 at 4:50 PM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
> On 09/04/2009 11:38, "Tej" <bewith.tej@xxxxxxxxx> wrote:
>
>> eg in GCOV case, I issued hypercall, when there is no corresponding
>> entry in Hypervisor, it gives -38<3> as return type. and Kernel Send a
>> message to userspace (in case of kernel module) as Kernel does not
>> have module support, which is total misleading.
>
> The return code is ENOSYS, which is appropriate for an unimplemented
> hypercall.

Still it could be misleading, because in case of kernel modules
"module-uti"l packages overrides ENOSYS with message as "Kernel does
not have module support"

an explicit return type could be useful here.

>
>  -- Keir
>
>
>

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