linux-kernel - [PATCH][next] wifi: wil6210: fw: Replace zero-length arrays with DECLARE_FLEX

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Message-ID: <ZGKHByxujJoygK+l@work>
Date:   Mon, 15 May 2023 13:24:55 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] wifi: wil6210: fw: Replace zero-length arrays with
 DECLARE_FLEX_ARRAY() helper

Zero-length arrays are deprecated, and we are moving towards adopting
C99 flexible-array members, instead. So, replace zero-length arrays
declarations alone in structs with the new DECLARE_FLEX_ARRAY()
helper macro.

This helper allows for flexible-array members alone in structs.

Link: https://github.com/KSPP/linux/issues/193
Link: https://github.com/KSPP/linux/issues/287
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/net/wireless/ath/wil6210/fw.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/wil6210/fw.h b/drivers/net/wireless/ath/wil6210/fw.h
index 440614d61156..aa1620e0d24f 100644
--- a/drivers/net/wireless/ath/wil6210/fw.h
+++ b/drivers/net/wireless/ath/wil6210/fw.h
@@ -47,7 +47,7 @@ struct wil_fw_record_fill { /* type == wil_fw_type_fill */
  * for informational purpose, data_size is @head.size from record header
  */
 struct wil_fw_record_comment { /* type == wil_fw_type_comment */
-	u8 data[0]; /* free-form data [data_size], see above */
+	DECLARE_FLEX_ARRAY(u8, data); /* free-form data [data_size], see above */
 } __packed;
 
 /* Comment header - common for all comment record types */
@@ -131,7 +131,7 @@ struct wil_fw_data_dwrite {
  * data_size is @head.size where @head is record header
  */
 struct wil_fw_record_direct_write { /* type == wil_fw_type_direct_write */
-	struct wil_fw_data_dwrite data[0];
+	DECLARE_FLEX_ARRAY(struct wil_fw_data_dwrite, data);
 } __packed;
 
 /* verify condition: [@addr] & @mask == @value
-- 
2.34.1