Re: [PATCH] blk-mq: nvme: Fix general protection fault in nvme_setup_descriptor_pools()

[Sungwoo Kim]

On Mon, Mar 9, 2026 at 11:31 AM Caleb Sander Mateos
<csander@xxxxxxxxxxxxxxx> wrote:
>
> On Mon, Mar 9, 2026 at 1:42 AM kernel test robot <lkp@xxxxxxxxx> wrote:
> >
> > Hi Sungwoo,
> >
> > kernel test robot noticed the following build errors:
> >
> > [auto build test ERROR on axboe/for-next]
> > [also build test ERROR on device-mapper-dm/for-next linus/master v6.16-rc1 next-20260306]
> > [cannot apply to linux-nvme/for-next]
> > [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/Sungwoo-Kim/blk-mq-nvme-Fix-general-protection-fault-in-nvme_setup_descriptor_pools/20260309-143107
> > base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git for-next
> > patch link:    https://lore.kernel.org/r/20260309062840.2937858-2-iam%40sung-woo.kim
> > patch subject: [PATCH] blk-mq: nvme: Fix general protection fault in nvme_setup_descriptor_pools()
> > config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260309/202603090911.0DdOwjTR-lkp@xxxxxxxxx/config)
> > compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
> > rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260309/202603090911.0DdOwjTR-lkp@xxxxxxxxx/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@xxxxxxxxx>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202603090911.0DdOwjTR-lkp@xxxxxxxxx/
> >
> > All errors (new ones prefixed by >>):
> >
> > >> error[E0308]: mismatched types
> >    --> rust/kernel/block/mq/operations.rs:274:28
> >    |
> >    274 |         init_request: Some(Self::init_request_callback),
> >    |                       ---- ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected fn pointer, found fn item
> >    |                       |
> >    |                       arguments to this enum variant are incorrect
> >    |
> >    = note: expected fn pointer `unsafe extern "C" fn(_, _, _, i32) -> _`
> >    found fn item `unsafe extern "C" fn(_, _, _, u32) -> _ {block::mq::operations::OperationsVTable::<T>::init_request_callback}`
> >    help: the type constructed contains `unsafe extern "C" fn(*mut bindings::blk_mq_tag_set, *mut bindings::request, u32, u32) -> i32 {block::mq::operations::OperationsVTable::<T>::init_request_callback}` due to the type of the argument passed
>
> Looks like the type of _numa_node in the signature of
> init_request_callback() needs to be updated accordingly from c_uint to
> c_int.
>
> Best,
> Caleb

I will change it in V2, thanks.
Also, I may need to split the patches by driver as the cc list explodes.

Sungwoo