linux-kernel - Re: [PATCH] hyperv: fix build if KEXEC not enabled

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Message-ID: <87egi9bclm.fsf@vitty.brq.redhat.com>
Date:	Tue, 08 Sep 2015 09:21:25 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hyperv: fix build if KEXEC not enabled

Stephen Hemminger <stephen@...workplumber.org> writes:

> Fixes regression 4.3 mergw window in my config 
> where hyperv is enable but CONFIG_KEXEC not enabled.
>
> arch/x86/kernel/cpu/mshyperv.c:112: undefined reference to `native_machine_crash_shutdown'
>
> Introduced by:
>    commit b4370df2b1f5158de028e167974263c5757b34a6
>    Author: Vitaly Kuznetsov <vkuznets@...hat.com>
>    Date:   Sat Aug 1 16:08:09 2015 -0700
>
>        Drivers: hv: vmbus: add special crash handler
>
> Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
>
> --- a/arch/x86/kernel/cpu/mshyperv.c	2015-09-07 10:11:24.994885115 -0700
> +++ b/arch/x86/kernel/cpu/mshyperv.c	2015-09-07 10:14:20.995698615 -0700
> @@ -109,7 +109,9 @@ static void hv_machine_crash_shutdown(st
>  {
>  	if (hv_crash_handler)
>  		hv_crash_handler(regs);
> +#ifdef CONFIG_KEXEC
>  	native_machine_crash_shutdown(regs);
> +#endif
>  }

Greg in particular was against #ifdefs in C code and I sent the
following patch to fix the issue:

https://lkml.org/lkml/2015/8/11/417

-- 
  Vitaly
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