linux-kernel - Re: [PATCH] x86/xen: Fix a -Wmissing prototypes warning for xen_start

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Date:   Mon, 8 Jun 2020 15:30:13 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Benjamin Thiel <b.thiel@...teo.de>, Borislav Petkov <bp@...en8.de>,
        Juergen Gross <jgross@...e.com>
Cc:     x86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/xen: Fix a -Wmissing prototypes warning for
 xen_start_kernel()

On 6/6/20 10:27 AM, Benjamin Thiel wrote:
> Fix:
>
>   arch/x86/xen/enlighten_pv.c:1212:34:
>   warning: no previous prototype for ‘xen_start_kernel’ [-Wmissing-prototypes]
>   asmlinkage __visible void __init xen_start_kernel(void)
>
> Add a prototype for xen_start_kernel() in a separate xen-specific header.

TBH I am not sure it's worth a new header file for a routine that is
only called from assembly (and never returns). I'd just add the
prototype right above function definition, with a comment describing
why. I see a few examples of this in the tree. Or maybe we even have an
attribute for this case?

(I also suspect the same may be needed for xen_prepare_pvh() BTW).

-boris