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

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Message-ID: <20260106132821.GA293394@nvidia.com>
Date: Tue, 6 Jan 2026 09:28:21 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: "Tian, Kevin" <kevin.tian@...el.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!

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:

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

commit efa03dab7ce4ed786b131f412440e2fd45fba11f does not have that
change.

Jason