Re: [PATCH RFC v2 6/6] KVM: introduce a new API for getting dirty bitmaps

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On 04/23/2010 03:27 PM, Arnd Bergmann wrote:

Using a 64-bit integer avoids the problem (though perhaps not sufficient
for s390, Arnd?)
When there is only a __u64 for the address, it will work on s390 as well,
gcc is smart enough to clear the upper bit on a cast from long to pointer.

Ah, much more convenient than compat_ioctl. I assume it part of the ABI, not a gccism?

Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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