Re: next-20250901 drivers bluetooth bpa10x.c:77:33: error: array type has incomplete element type 'struct h4_recv_pkt'

[Calvin Owens <calvin@wbinvd.org>]

On Tuesday 09/02 at 15:00 +0530, Naresh Kamboju wrote:
> The following build warnings / errors are noticed on powerpc ppc6xx_defconfig
> with gcc-13 toolchain running on Linux next-20250901 and next-20250902.
> 
> Regression Analysis:
> - New regression? yes
> - Reproducibility? yes
> 
> First seen on next-20250901
> Bad: next-20250901 and next-20250902
> Good: next-20250829
> 
> Build regression: next-20250901 drivers bluetooth bpa10x.c:77:33:
> error: array type has incomplete element type 'struct h4_recv_pkt'
> 
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> 
> Powerpc:
>   build:
>     * gcc-13-ppc6xx_defconfig
>     * gcc-8-ppc6xx_defconfig

Hi Naresh,

This should fix it:
https://lore.kernel.org/all/aLNRvzXE4O9dKZoN@mozart.vkv.me/

Thanks,
Calvin

> Build error:
> drivers/bluetooth/bpa10x.c:77:33: error: array type has incomplete
> element type 'struct h4_recv_pkt'
>    77 | static const struct h4_recv_pkt bpa10x_recv_pkts[] = {
>       |                                 ^~~~~~~~~~~~~~~~
> drivers/bluetooth/bpa10x.c:78:11: error: 'H4_RECV_ACL' undeclared here
> (not in a function)
>    78 |         { H4_RECV_ACL,     .recv = hci_recv_frame },
>       |           ^~~~~~~~~~~
> drivers/bluetooth/bpa10x.c:79:11: error: 'H4_RECV_SCO' undeclared here
> (not in a function)
>    79 |         { H4_RECV_SCO,     .recv = hci_recv_frame },
>       |           ^~~~~~~~~~~
> drivers/bluetooth/bpa10x.c:80:11: error: 'H4_RECV_EVENT' undeclared
> here (not in a function)
>    80 |         { H4_RECV_EVENT,   .recv = hci_recv_frame },
>       |           ^~~~~~~~~~~~~
> drivers/bluetooth/bpa10x.c: In function 'bpa10x_rx_complete':
> drivers/bluetooth/bpa10x.c:99:37: error: implicit declaration of
> function 'h4_recv_buf' [-Werror=implicit-function-declaration]
>    99 |                 data->rx_skb[idx] = h4_recv_buf(hdev, data->rx_skb[idx],
>       |                                     ^~~~~~~~~~~
> In file included from include/linux/array_size.h:5,
>                  from include/linux/kernel.h:16,
>                  from drivers/bluetooth/bpa10x.c:9:
> include/linux/compiler.h:197:82: error: expression in static assertion
> is not an integer
>   197 | #define __BUILD_BUG_ON_ZERO_MSG(e, msg, ...)
> ((int)sizeof(struct {_Static_assert(!(e), msg);}))
>       |
>                   ^
> include/linux/compiler.h:202:33: note: in expansion of macro
> '__BUILD_BUG_ON_ZERO_MSG'
>   202 | #define __must_be_array(a)
> __BUILD_BUG_ON_ZERO_MSG(!__is_array(a), \
>       |                                 ^~~~~~~~~~~~~~~~~~~~~~~
> include/linux/array_size.h:11:59: note: in expansion of macro '__must_be_array'
>    11 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) +
> __must_be_array(arr))
>       |
> ^~~~~~~~~~~~~~~
> drivers/bluetooth/bpa10x.c:103:49: note: in expansion of macro 'ARRAY_SIZE'
>   103 |
> ARRAY_SIZE(bpa10x_recv_pkts));
>       |                                                 ^~~~~~~~~~
> drivers/bluetooth/bpa10x.c: At top level:
> drivers/bluetooth/bpa10x.c:77:33: warning: 'bpa10x_recv_pkts' defined
> but not used [-Wunused-variable]
>    77 | static const struct h4_recv_pkt bpa10x_recv_pkts[] = {
>       |                                 ^~~~~~~~~~~~~~~~
> cc1: some warnings being treated as errors
> 
> 
> ## Source
> * Kernel version: 6.17.0-rc4
> * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
> * Git describe: next-20250902
> * Git commit: 3db46a82d467bd23d9ebc473d872a865785299d8
> * Architectures: powerpc
> * Toolchains: gcc-13
> * Kconfigs: ppc6xx_defconfig
> 
> ## Build
> * Build log: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250902/testrun/29725581/suite/build/test/gcc-13-ppc6xx_defconfig/log
> * Build details:
> https://regressions.linaro.org/lkft/linux-next-master/next-20250901/log-parser-build-gcc/gcc-compiler-drivers_bluetooth_bpax_c-error-array-type-has-incomplete-element-type-struct-h_recv_pkt/
> * Build plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/builds/328DwMMwNOpSAj0qnRpJavgtz9C
> * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/328DwMMwNOpSAj0qnRpJavgtz9C/
> * Kernel config:
> https://storage.tuxsuite.com/public/linaro/lkft/builds/328DwMMwNOpSAj0qnRpJavgtz9C/config
> 
> --
> Linaro LKFT
> https://lkft.linaro.org