linux-kernel - Re: [PATCH] xen/balloon: Mark unallocated host memory as UNUSABLE

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Message-ID: <dec5f7b0-0f1f-bade-c2da-17fdcb5cf6ba@oracle.com>
Date:   Fri, 15 Dec 2017 11:21:05 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, xen-devel@...ts.xen.org,
        linux-kernel@...r.kernel.org, jgross@...e.com, helgaas@...nel.org,
        christian.koenig@....com
Subject: Re: [PATCH] xen/balloon: Mark unallocated host memory as UNUSABLE

On 12/15/2017 11:04 AM, kbuild test robot wrote:
> Hi Boris,
>
> I love your patch! Yet something to improve:
>
> [auto build test ERROR on xen-tip/linux-next]
> [also build test ERROR on v4.15-rc3 next-20171215]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url:    https://github.com/0day-ci/linux/commits/Boris-Ostrovsky/xen-balloon-Mark-unallocated-host-memory-as-UNUSABLE/20171215-231511
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git linux-next
> config: i386-randconfig-x010-201750 (attached as .config)
> compiler: gcc-7 (Debian 7.2.0-12) 7.2.1 20171025
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=i386 

Oh, right...


-boris

>
> All errors (new ones prefixed by >>):
>
>    arch/x86/xen/enlighten.c: In function 'arch_xen_balloon_init':
>>> arch/x86/xen/enlighten.c:341:27: error: 'max_pfn' undeclared (first use in this function); did you mean 'pgd_pfn'?
>      unsigned long max_addr = max_pfn << PAGE_SHIFT;
>                               ^~~~~~~
>                               pgd_pfn
>    arch/x86/xen/enlighten.c:341:27: note: each undeclared identifier is reported only once for each function it appears in
>
> vim +341 arch/x86/xen/enlighten.c
>
>    335	
>    336	#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
>    337	void __init arch_xen_balloon_init(struct resource *hostmem_resource)
>    338	{
>    339		struct xen_memory_map memmap;
>    340		int rc, i, last_guest_ram;
>  > 341		unsigned long max_addr = max_pfn << PAGE_SHIFT;
>
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation