linux-kernel - next-20250901 drivers bluetooth bpa10x.c:77:33: error: array type has incomplete element type 'struct h4_recv

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Message-ID: <CA+G9fYsgiqTo7t3e36P5cysc+jEX5Fub1quTj+fuKGM8jkxbFA@mail.gmail.com>
Date: Tue, 2 Sep 2025 15:00:19 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: linux-bluetooth@...r.kernel.org, open list <linux-kernel@...r.kernel.org>, 
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>
Cc: Luiz Augusto von Dentz <luiz.dentz@...il.com>, Marcel Holtmann <marcel@...tmann.org>, 
	Calvin Owens <calvin@...nvd.org>, pmenzel@...gen.mpg.de, 
	Luiz Augusto von Dentz <luiz.von.dentz@...el.com>, Dan Carpenter <dan.carpenter@...aro.org>, 
	Arnd Bergmann <arnd@...db.de>, Anders Roxell <anders.roxell@...aro.org>, 
	Ben Copeland <benjamin.copeland@...aro.org>
Subject: next-20250901 drivers bluetooth bpa10x.c:77:33: error: array type has
 incomplete element type 'struct h4_recv_pkt'

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@...aro.org>

Powerpc:
  build:
    * gcc-13-ppc6xx_defconfig
    * gcc-8-ppc6xx_defconfig

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