Re: [PATCH -v5][RFC]: mutex: implement adaptive spinning

Andi Kleen
2009-01-07T21:39:24Z

> I appreciate this is sample code, but using __get_user() on
> non-userspace pointers messes up architectures which have separate
> user/kernel spaces (eg the old 4G/4G split for x86-32). Do we have an
> appropriate function for kernel space pointers?

probe_kernel_address().

But it's slow.

-Andi

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ak@linux.intel.com