[Xen-devel] Re: [PATCH] Fix performance problems with mprotect()

[Andi Kleen <andi@xxxxxxxxxxxxxx>]

"Bruce Rogers" <brogers@xxxxxxxxxx> writes:
> +
> +        /* Allowed to change in Accessed/Dirty flags only. */
> +        BUG_ON((t ^ old) & ~(intpte_t)(_PAGE_ACCESSED|_PAGE_DIRTY));


Are you sure that BUG_ON can't be triggered from the hypercall?
It should error out in this case I think.

-Andi

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