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

[kernel test robot <lkp@intel.com>]

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@intel.com/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@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/202603090911.0DdOwjTR-lkp@intel.com/

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
   --> rust/kernel/block/mq/operations.rs:274:23
   |
   274 |         init_request: Some(Self::init_request_callback),
   |                       ^^^^^---------------------------^
   |                            |
   |                            this argument influences the type of `Some`
   note: tuple variant defined here
   --> /opt/cross/rustc-1.88.0-bindgen-0.72.1/rustup/toolchains/1.88.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:597:5
   |
   597 |     Some(#[stable(feature = "rust1", since = "1.0.0")] T),
   |     ^^^^

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