linux-kernel - RE: ERROR: modpost: "__pt_no_sw_bit" [drivers/iommu/generic_pt/fmt/iommu

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Message-ID: <BN9PR11MB5276C1D60A1E75ECF872E9948C85A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Thu, 8 Jan 2026 02:31:10 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: lkp <lkp@...el.com>, "oe-kbuild-all@...ts.linux.dev"
	<oe-kbuild-all@...ts.linux.dev>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Joerg Roedel <joerg.roedel@....com>
Subject: RE: ERROR: modpost: "__pt_no_sw_bit"
 [drivers/iommu/generic_pt/fmt/iommu_amdv1.ko] undefined!

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Tuesday, January 6, 2026 9:28 PM
> 
> On Tue, Jan 06, 2026 at 08:09:27AM +0000, Tian, Kevin wrote:
> > > From: lkp <lkp@...el.com>
> > > Sent: Tuesday, December 23, 2025 7:25 AM
> > >
> > > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> > > master
> > > head:   b927546677c876e26eba308550207c2ddf812a43
> > > commit: efa03dab7ce4ed786b131f412440e2fd45fba11f iommupt: Flush
> the
> > > CPU cache after any writes to the page table
> > > date:   7 weeks ago
> > > config: powerpc64-randconfig-r051-20251223
> > > (https://download.01.org/0day-
> > > ci/archive/20251223/202512230720.9y9DtWIo-lkp@...el.com/config)
> > > compiler: powerpc64-linux-gcc (GCC) 8.5.0
> > > reproduce (this is a W=1 build): (https://download.01.org/0day-
> > > ci/archive/20251223/202512230720.9y9DtWIo-lkp@...el.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/202512230720.9y9DtWIo-
> > > lkp@...el.com/
> > >
> > > All errors (new ones prefixed by >>, old ones prefixed by <<):
> > >
> > > >> ERROR: modpost: "__pt_no_sw_bit"
> > > [drivers/iommu/generic_pt/fmt/iommu_amdv1.ko] undefined!
> > >
> >
> > Jason, are you deliberately leaving it undefined to catch config which
> shouldn't
> > compile generic_pt in, or is it indeed a bug?
> 
> I think this was already fixed:

I pulled rc4. still can observe the error.

> 
> https://lore.kernel.org/all/0-v1-63a2cffb09da+4486-
> iommufd_gcc_bounds_jgg@...dia.com/
> 

that seems to fix an out-of-bound selftest error. Not about this one?