linux-kernel - Re: [PATCH] Drivers: hv: ioctl for self targeted passthrough hvcalls

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Message-ID: <aRtiHkEYMi_eqTvQ@anirudh-surface.localdomain>
Date: Mon, 17 Nov 2025 17:57:50 +0000
From: Anirudh Rayabharam <anirudh@...rudhrb.com>
To: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Cc: Wei Liu <wei.liu@...nel.org>, kernel test robot <lkp@...el.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Dexuan Cui <decui@...rosoft.com>, Long Li <longli@...rosoft.com>,
	llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Drivers: hv: ioctl for self targeted passthrough hvcalls

On Mon, Nov 17, 2025 at 09:41:19AM -0800, Nuno Das Neves wrote:
> On 11/17/2025 9:34 AM, Wei Liu wrote:
> > +Nuno
> > 
> > On Sun, Nov 16, 2025 at 04:17:08PM +0800, kernel test robot wrote:
> >> Hi Anirudh,
> >>
> >> kernel test robot noticed the following build errors:
> >>
> >> [auto build test ERROR on linus/master]
> >> [also build test ERROR on v6.18-rc5]
> >> [cannot apply to next-20251114]
> >> [If your patch is applied to the wrong git tree, kindly drop us a note.
> >> And when submitting patch, we suggest to use '--base' as documented in
> >> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> >>
> >> url:    https://github.com/intel-lab-lkp/linux/commits/Anirudh-Rayabharam/Drivers-hv-ioctl-for-self-targeted-passthrough-hvcalls/20251114-182039
> >> base:   linus/master
> >> patch link:    https://lore.kernel.org/r/20251114095853.3482596-1-anirudh%40anirudhrb.com
> >> patch subject: [PATCH] Drivers: hv: ioctl for self targeted passthrough hvcalls
> >> config: x86_64-buildonly-randconfig-005-20251116 (https://download.01.org/0day-ci/archive/20251116/202511161617.KcDzR4sA-lkp@intel.com/config)
> >> compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
> >> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251116/202511161617.KcDzR4sA-lkp@intel.com/reproduce)
> >>
> >> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> >> the same patch/commit), kindly add following tags
> >> | Reported-by: kernel test robot <lkp@...el.com>
> >> | Closes: https://lore.kernel.org/oe-kbuild-all/202511161617.KcDzR4sA-lkp@intel.com/
> >>
> >> All errors (new ones prefixed by >>):
> >>
> >>>> drivers/hv/mshv_root_main.c:125:2: error: use of undeclared identifier 'HVCALL_GET_PARTITION_PROPERTY_EX'
> >>      125 |         HVCALL_GET_PARTITION_PROPERTY_EX,
> >>          |         ^
> > 
> > Anirudh, please check this.
> > 
> This is introduced in hyperv-next, in:
> 59aeea195948 mshv: Add the HVCALL_GET_PARTITION_PROPERTY_EX hypercall
> 
> But the bot applies the patch to linus/master, that is probably why.

Right. In the v2 of this patch, I used the --base argument to git
format-patch as suggested by the tool above. That should help it apply
the patch in the right tree. Let's see if it still complains.

Anirudh

> 
> >>>> drivers/hv/mshv_root_main.c:175:18: error: invalid application of 'sizeof' to an incomplete type 'u16[]' (aka 'unsigned short[]')
> >>      175 |         for (i = 0; i < ARRAY_SIZE(mshv_passthru_hvcalls); ++i)
> >>          |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > 
> > This is from the original patch. Perhaps adding the explicit declaration
> > of the array size would help.
> > 
> 
> I think this is just due to the earlier error...
> 
> Nuno
> 
> > Wei
>