linux-kernel - Re: [PATCH 2/5] X86: Hyper-V: Enable IPI enlightenments

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Date:   Fri, 27 Apr 2018 00:31:49 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     kys@...rosoft.com
Cc:     x86@...nel.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        olaf@...fle.de, apw@...onical.com, jasowang@...hat.com,
        tglx@...utronix.de, hpa@...or.com, sthemmin@...rosoft.com,
        Michael.H.Kelley@...rosoft.com, vkuznets@...hat.com
Subject: Re: [PATCH 2/5] X86: Hyper-V: Enable IPI enlightenments

On Wed, Apr 25, 2018 at 11:12:47AM -0700, kys@...uxonhyperv.com wrote:
> +/*
> + * IPI implementation on Hyper-V.
> + */
> +
> +static int __send_ipi_mask(const struct cpumask *mask, int vector)
> +{
> +	int cur_cpu, vcpu;
> +	struct ipi_arg_non_ex **arg;
> +	struct ipi_arg_non_ex *ipi_arg;
> +	int ret = 1;

Not specifically related to this patch, but hv code sometimes returns 1
on error or U64_MAX.  It's slightly magical.  Maybe
HV_STATUS_INVALID_HYPERCALL_INPUT (3) would be more appropriate?  Or we
could make a new more generic error code:

#define HV_STATUS_INVALID        1

regards,
dan carpenter