linux-hardening - [PATCH][next] mei: Avoid a bunch of -Wflex-array-member-not-at-end warnings

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Date: Mon, 25 Mar 2024 14:01:23 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Tomas Winkler <tomas.winkler@...el.com>, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH][next] mei: Avoid a bunch of -Wflex-array-member-not-at-end
 warnings

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

After commit 40292383640a ("mei: revamp mei extension header structure layout.")
it seems that flexible-array member `data` in `struct mei_ext_hdr` is no longer
needed. So, remove it and, with that, fix 45 of the following
-Wflex-array-member-not-at-end warnings[1] in drivers/misc/mei/:

drivers/misc/mei/hw.h:280:28: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Link: https://gist.github.com/GustavoARSilva/62dcc235555a6b29b506269edb83da0b [1] 
Link: https://github.com/KSPP/linux/issues/202
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/misc/mei/hw.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h
index eb800a07a84b..2e9cf6f4efb6 100644
--- a/drivers/misc/mei/hw.h
+++ b/drivers/misc/mei/hw.h
@@ -247,12 +247,10 @@ enum mei_ext_hdr_type {
  * struct mei_ext_hdr - extend header descriptor (TLV)
  * @type: enum mei_ext_hdr_type
  * @length: length excluding descriptor
- * @data: the extended header payload
  */
 struct mei_ext_hdr {
 	u8 type;
 	u8 length;
-	u8 data[];
 } __packed;
 
 /**
-- 
2.34.1