linux-kernel - Re: [PATCH 1/1] X86/Hyper-V:: Fix the circular dependency in IPI enlightenment.

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Date:   Wed, 4 Jul 2018 18:10:39 +0200
From:   Ingo Molnar <mingo@...nel.org>
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 1/1] X86/Hyper-V:: Fix the circular dependency in IPI
 enlightenment.


* kys@...uxonhyperv.com <kys@...uxonhyperv.com> wrote:

> From: "K. Y. Srinivasan" <kys@...rosoft.com>
> 
> The IPI hypercalls depend on being able to map the Linux notion of CPU ID
> to the hypervisor's notion of the CPU ID. The array hv_vp_index[] provides
> this mapping. Code for populating this array depends on the IPI functionality.
> Break this circular dependency.
> 
> Fixes: 68bb7bfb7985 ("X86/Hyper-V: Enable IPI enlightenments")
> 
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Tested-by: Michael Kelley <mikelley@...rosoft.com>
> ---
>  arch/x86/hyperv/hv_apic.c       | 5 +++++
>  arch/x86/hyperv/hv_init.c       | 5 ++++-
>  arch/x86/include/asm/mshyperv.h | 2 ++
>  3 files changed, 11 insertions(+), 1 deletion(-)

Ugh, this patch wasn't even build tested, on 64-bit allyes/allmodconfig:

 arch/x86/hyperv/hv_apic.c: In function ‘__send_ipi_mask’:
 arch/x86/hyperv/hv_apic.c:171:4: error: label ‘ipi_mask_done’ used but not defined
 scripts/Makefile.build:317: recipe for target 'arch/x86/hyperv/hv_apic.o' failed
 make[2]: *** [arch/x86/hyperv/hv_apic.o] Error 1

Thanks,

	Ingo