Re: [tip:timers/vdso 37/45] progs/hid_bpf_helpers.h:117:31: error: declaration of 'struct bpf_wq' will not be visible outside of this function

[Thomas Weißschuh]

Hi Jiri and Benjamin,

could you take a look at the report below?
This looks like an issue in the HID BPF subsystem, surfaced by my
unrelated change. Does this ring a bell for you?

I wasn't able to reproduce it so far, but will continue looking into it.


Thomas

On Wed, Mar 11, 2026 at 03:29:54PM +0100, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/vdso
> head:   f7178f159b2a36d070fd43b0d751e4e4415ec39e
> commit: 912632a7fd4cc1eac2778828d92e8fe46939d6bd [37/45] vdso/datapage: Trim down unnecessary includes
> config: riscv-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260311/202603111558.KLCIxsZB-lkp@xxxxxxxxx/config)
> compiler: riscv64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260311/202603111558.KLCIxsZB-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/202603111558.KLCIxsZB-lkp@xxxxxxxxx/
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from progs/hid.c:3:
> >> progs/hid_bpf_helpers.h:117:31: error: declaration of 'struct bpf_wq' will not be visible outside of this function [-Werror,-Wvisibility]
>      117 | extern int bpf_wq_init(struct bpf_wq *wq, void *p__map, unsigned int flags) __weak __ksym;
>          |                               ^
>    progs/hid_bpf_helpers.h:118:32: error: declaration of 'struct bpf_wq' will not be visible outside of this function [-Werror,-Wvisibility]
>      118 | extern int bpf_wq_start(struct bpf_wq *wq, unsigned int flags) __weak __ksym;
>          |                                ^
>    progs/hid_bpf_helpers.h:119:39: error: declaration of 'struct bpf_wq' will not be visible outside of this function [-Werror,-Wvisibility]
>      119 | extern int bpf_wq_set_callback(struct bpf_wq *wq,
>          |                                       ^
> >> progs/hid.c:448:16: error: field has incomplete type 'struct bpf_wq'
>      448 |         struct bpf_wq work;
>          |                       ^
>    progs/hid.c:448:9: note: forward declaration of 'struct bpf_wq'
>      448 |         struct bpf_wq work;
>          |                ^
> >> progs/hid.c:487:18: error: incompatible pointer types passing 'struct bpf_wq *' to parameter of type 'struct bpf_wq *' [-Wincompatible-pointer-types]
>      487 |         if (bpf_wq_init(wq, &hmap, 0) != 0)
>          |                         ^~
>    progs/hid_bpf_helpers.h:117:39: note: passing argument to parameter 'wq' here
>      117 | extern int bpf_wq_init(struct bpf_wq *wq, void *p__map, unsigned int flags) __weak __ksym;
>          |                                       ^
>    progs/hid.c:490:26: error: incompatible pointer types passing 'struct bpf_wq *' to parameter of type 'struct bpf_wq *' [-Wincompatible-pointer-types]
>      490 |         if (bpf_wq_set_callback(wq, wq_cb_sleepable, 0))
>          |                                 ^~
>    progs/hid_bpf_helpers.h:119:47: note: passing argument to parameter 'wq' here
>      119 | extern int bpf_wq_set_callback(struct bpf_wq *wq,
>          |                                               ^
>    progs/hid.c:493:19: error: incompatible pointer types passing 'struct bpf_wq *' to parameter of type 'struct bpf_wq *' [-Wincompatible-pointer-types]
>      493 |         if (bpf_wq_start(wq, 0))
>          |                          ^~
>    progs/hid_bpf_helpers.h:118:40: note: passing argument to parameter 'wq' here
>      118 | extern int bpf_wq_start(struct bpf_wq *wq, unsigned int flags) __weak __ksym;
>          |                                        ^
>    progs/hid.c:503:24: error: incomplete definition of type 'struct hid_device'
>      503 |         int hid = hid_ctx->hid->id;
>          |                   ~~~~~~~~~~~~^
>    progs/hid_bpf_helpers.h:59:9: note: forward declaration of 'struct hid_device'
>       59 |         struct hid_device *hid;
>          |                ^
>    8 errors generated.
> 
> -- 
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki