linux-kernel - [PATCH][next] wifi: ath12k: core.h: Avoid -Wflex-array-member-not-at-end warnings

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Message-ID: <Z8-Snz86Xfwdlyd7@kspp>
Date: Tue, 11 Mar 2025 12:02:15 +1030
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Johannes Berg <johannes@...solutions.net>,
	Jeff Johnson <jjohnson@...nel.org>
Cc: linux-wireless@...r.kernel.org, ath12k@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH][next] wifi: ath12k: core.h: Avoid
 -Wflex-array-member-not-at-end warnings

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Move the conflicting declaration to the end of the structure. Notice
that `struct ieee80211_chanctx_conf` is a flexible structure --a
structure that contains a flexible-array member.

Fix 30 of the following warnings:

drivers/net/wireless/ath/ath12k/core.h:298:39: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/net/wireless/ath/ath12k/core.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath12k/core.h b/drivers/net/wireless/ath/ath12k/core.h
index 3fac4f00d383..d6b4c4d2c400 100644
--- a/drivers/net/wireless/ath/ath12k/core.h
+++ b/drivers/net/wireless/ath/ath12k/core.h
@@ -295,7 +295,6 @@ struct ath12k_link_vif {
 	int txpower;
 	bool rsnie_present;
 	bool wpaie_present;
-	struct ieee80211_chanctx_conf chanctx;
 	u8 vdev_stats_id;
 	u32 punct_bitmap;
 	u8 link_id;
@@ -303,6 +302,13 @@ struct ath12k_link_vif {
 	struct ath12k_rekey_data rekey_data;
 
 	u8 current_cntdown_counter;
+
+	/* Must be last - ends in a flexible-array member.
+	 *
+	 * FIXME: Driver should not copy struct ieee80211_chanctx_conf,
+	 * especially because it has a flexible array. Find a better way.
+	 */
+	struct ieee80211_chanctx_conf chanctx;
 };
 
 struct ath12k_vif {
-- 
2.43.0