Re: [akpm-mm:mm-unstable /301] net/core/page_pool.c:713:71: sparse: sparse: incorrect type in argument 1 (different base types)

[Byungchul Park <byungchul@sk.com>]

On Fri, Jan 16, 2026 at 03:15:00PM -0800, Andrew Morton wrote:
> On Fri, 16 Jan 2026 16:41:32 +0800 kernel test robot <lkp@intel.com> wrote:
> 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
> > head:   fe2c34b6ea5a0e1175c30d59bc1c28caafb02c62
> > commit: 7699fe82442a62ea29a3745b29dbb8ef8c42d8db [/301] mm: introduce a new page type for page pool in page type
> > config: x86_64-randconfig-122-20260115 (https://download.01.org/0day-ci/archive/20260116/202601161606.8RuyUh2k-lkp@intel.com/config)
> > compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260116/202601161606.8RuyUh2k-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@intel.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202601161606.8RuyUh2k-lkp@intel.com/
> >
> > sparse warnings: (new ones prefixed by >>)
> > >> net/core/page_pool.c:713:71: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected restricted netmem_ref [usertype] netmem @@     got unsigned long @@
> >    net/core/page_pool.c:713:71: sparse:     expected restricted netmem_ref [usertype] netmem
> >    net/core/page_pool.c:713:71: sparse:     got unsigned long
> >    net/core/page_pool.c:734:73: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected restricted netmem_ref [usertype] netmem @@     got unsigned long @@
> >    net/core/page_pool.c:734:73: sparse:     expected restricted netmem_ref [usertype] netmem
> >    net/core/page_pool.c:734:73: sparse:     got unsigned long
> 
> Oh, OK.
> 
> Byungchul, please remind me why I'm carrying a page-pool patch?  I
> applied it because email headers and because Suggested-by:David, but
> these things are usually carried in the networking tree.

Sorry for late reply.  This patch changes both mm and network, but I
aimed at mm tree since I thought it's more about mm - Jakub also think
so.  See the following link:

  https://lore.kernel.org/all/20250813075212.051b5178@kernel.org/

> And I never applied [patch 2/2]
> (https://lkml.kernel.org/r/20251215071001.78263-3-byungchul@sk.com)
> because "kernel test robot" reported a build error.
> 
> In fact, I'll drop the patch - please let's have a redo.

Okay.  I will retry.  Thanks.

	Byungchul