An array of size 1 at the end of a structure looks like an opportunity for
a flexible array.  Be sure that no one is doing a sizeof of this structure
type.

julia

---------- Forwarded message ----------
Date: Thu, 10 Nov 2022 08:48:05 +0800
From: kernel test robot <lkp@intel.com>
To: oe-kbuild@lists.linux.dev
Cc: lkp@intel.com, Julia Lawall <julia.lawall@lip6.fr>
Subject: [linux-next:master 448/6614]
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c:116:6-9: WARNING
     use flexible-array member instead
    (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-
    and-one-element-arrays)

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: Linux Memory Management List <linux-mm@kvack.org>
TO: Wright Feng <wright.feng@cypress.com>
CC: Kalle Valo <kvalo@kernel.org>
CC: "Chi-hsien Lin" <chi-hsien.lin@cypress.com>
CC: Ian Lin <ian.lin@infineon.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   94db6b12c18d7cf7c5726dbe816c2248494a778d
commit: 6c04deae1438e5df59fc4848795248fc34961f51 [448/6614] brcmfmac: Add dump_survey cfg80211 ops for HostApd AutoChannelSelection
:::::: branch date: 19 hours ago
:::::: commit date: 5 weeks ago
config: sparc64-randconfig-c023-20221107
compiler: sparc64-linux-gcc (GCC) 12.1.0

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Julia Lawall <julia.lawall@lip6.fr>

cocci warnings: (new ones prefixed by >>)
>> drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c:116:6-9: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)

vim +116 drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c

6c04deae1438e5 Wright Feng 2022-09-28  112
6c04deae1438e5 Wright Feng 2022-09-28  113  struct cca_stats_n_flags {
6c04deae1438e5 Wright Feng 2022-09-28  114  	u32 msrmnt_time; /* Time for Measurement (msec) */
6c04deae1438e5 Wright Feng 2022-09-28  115  	u32 msrmnt_done; /* flag set when measurement complete */
6c04deae1438e5 Wright Feng 2022-09-28 @116  	char buf[1];
6c04deae1438e5 Wright Feng 2022-09-28  117  };
6c04deae1438e5 Wright Feng 2022-09-28  118

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