netdev - [PATCH net-next 4/8] wifi: ath6k: silence false positive -Wno-dangling-pointer warning on GCC 12

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Date:   Fri, 20 May 2022 12:43:16 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     kvalo@...nel.org, johannes@...solutions.net
Cc:     netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next 4/8] wifi: ath6k: silence false positive -Wno-dangling-pointer warning on GCC 12

For some reason GCC 12 decided to complain about the common
pattern of queuing an object onto a list on the stack in ath6k:

    inlined from ‘ath6kl_htc_mbox_tx’ at drivers/net/wireless/ath/ath6kl/htc_mbox.c:1142:3:
include/linux/list.h:74:19: warning: storing the address of local variable ‘queue’ in ‘*&packet_15(D)->list.prev’ [-Wdangling-pointer=]
   74 |         new->prev = prev;
      |         ~~~~~~~~~~^~~~~~

Move the warning to W=1, hopefully it goes away with a compiler
update.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: kvalo@...nel.org
CC: linux-wireless@...r.kernel.org
---
 drivers/net/wireless/ath/ath6kl/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/ath/ath6kl/Makefile b/drivers/net/wireless/ath/ath6kl/Makefile
index dc2b3b46781e..01cc0d50fee6 100644
--- a/drivers/net/wireless/ath/ath6kl/Makefile
+++ b/drivers/net/wireless/ath/ath6kl/Makefile
@@ -36,6 +36,11 @@ ath6kl_core-y += wmi.o
 ath6kl_core-y += core.o
 ath6kl_core-y += recovery.o
 
+# FIXME: temporarily silence -Wdangling-pointer on non W=1+ builds
+ifndef KBUILD_EXTRA_WARN
+CFLAGS_htc_mbox.o += -Wno-dangling-pointer
+endif
+
 ath6kl_core-$(CONFIG_NL80211_TESTMODE) += testmode.o
 ath6kl_core-$(CONFIG_ATH6KL_TRACING) += trace.o
 
-- 
2.34.3