linux-kernel - Re: [PATCH 1/3] Drivers: hv: Make portions of Hyper-V init code be arch neutral

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Date:   Mon, 12 Jul 2021 18:24:00 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Michael Kelley <mikelley@...rosoft.com>
Cc:     sthemmin@...rosoft.com, kys@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com, arnd@...db.de,
        linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH 1/3] Drivers: hv: Make portions of Hyper-V init code be
 arch neutral

On Sun, Jul 11, 2021 at 08:25:14PM -0700, Michael Kelley wrote:
[...]
> +int hv_common_cpu_init(unsigned int cpu)
> +{
> +	void **inputarg, **outputarg;
> +	u64 msr_vp_index;
> +	gfp_t flags;
> +	int pgcount = hv_root_partition ? 2 : 1;
> +
> +	/* hv_cpu_init() can be called with IRQs disabled from hv_resume() */
> +	flags = irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL;
> +
> +	inputarg = (void **)this_cpu_ptr(hyperv_pcpu_input_arg);
> +	*inputarg = kmalloc(pgcount * HV_HYP_PAGE_SIZE, flags);

This is changed from alloc_pages to kmalloc. Does it ensure the
alignment is still correct? 

Wei.