RE: [PATCH v8 1/6] arm64: hyperv: Add Hyper-V hypercall and register access utilities

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> +}
> +EXPORT_SYMBOL_GPL(hv_do_fast_hypercall8);
> +
> +
nit: Extra line, here and few other places

> +u64 hv_get_vpreg(u32 msr)
> +{
> +	struct hv_get_vp_registers_input	*input;
> +	struct hv_get_vp_registers_output	*output;
> +	u64					result;
It seems like the code is using both spaces and tabs to align variable names. Can
we stick to one or the other, preferably spaces.

> +
> +	/*
> +	 * Allocate a power of 2 size so alignment to that size is
> +	 * guaranteed, since the hypercall input and output areas
> +	 * must not cross a page boundary.
> +	 */
> +	input = kzalloc(roundup_pow_of_two(sizeof(input->header) +
> +				sizeof(input->element[0])), GFP_ATOMIC);
> +	output = kmalloc(roundup_pow_of_two(sizeof(*output)), GFP_ATOMIC);
> +
Check for null from these malloc routines? Here and in other places.

> +	__hv_get_vpreg_128(msr, input, output);

+ * Linux-specific definitions for managing interactions with Microsoft's
+ * Hyper-V hypervisor. The definitions in this file are specific to
+ * the ARM64 architecture.  See include/asm-generic/mshyperv.h for
nit: Two space before 'See'. Here and in couple of other places.





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